Bairan Garcia, Jesus Miguel
Total activity: 100
Research group
TE - Structural Technology
Department
Department of Construction Engineering
School
Barcelona School of Civil Engineering (ETSECCPB)
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jesus.miguel.bairanupc.edu
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0000-0003-2831-1479 Open in new window
Scopus Author ID
16745058800 Open in new window
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  • Shear design of FRP reinforced concrete beams without transverse reinforcement

     Mari Bernat, Antonio Ricardo; Cladera Bohigas, Antoni; Oller Ibars, Eva; Bairan Garcia, Jesus Miguel
    Composites Part B: Engineering
    Date of publication: 2014-02
    Journal article

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    A simple and rational model for the prediction of the shear strength of FRP reinforced concrete beams without shear reinforcement is presented. The method is based on the principles of structural mechanics and on the experimentally observed behavior of RC beams at shear-flexural failure. It is assumed that, just before failure, the shear is resisted exclusively by the concrete flexural compression head at the critical section, placed at the tip of the shear crack closer to the support. Failure is considered to occur when the principal tensile stress at the concrete head reaches the concrete tensile strength. Simple design equations are provided, which explicitly account for those parameters governing the shear strength, such as the concrete tensile strength, the amount of longitudinal reinforcement ratio and the ratio between the elastic modulus of the longitudinal reinforcement and the concrete. The accuracy of the proposed method has been verified by comparing the model predictions with the results of 144 tests on CFRP and GFRP reinforced concrete beams and with a previously published database on steel reinforced concrete beams failing on shear, providing better results than those obtained using the design equations of current codes of practice, which are mainly empirically based.

  • Collapse of a precast concrete beam for a light roof: importance of elastomeric bearing pads in the element¿s stability

     Bairan Garcia, Jesus Miguel; Cladera Bohigas, Antoni
    Engineering failure analysis
    Date of publication: 2014-04
    Journal article

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    The importance of second order effects has been widely studied in slender concrete structures subjected to compressive stresses, although their effects are not generally taken into account in other fields of structural engineering; this is the case of the overall stability of structures flexible supports, as elastomeric bearing pads. In this paper, the collapse in construction of a 24.9 m span precast concrete Y-beam for the light roof of a sports hall is studied. The roof consisted of a series of these beams simply supported at each end by plain neoprene bearing pads. After a worker had climbed up to the last placed element, the element over-turned producing a partial collapse of the light roof. A simplified analysis, without considering second order effects, indicated that there was an over-turning safety factor (OSF) of 2.67. However, a more detailed analysis showed that with the bearing pad arrangement used, rotational stiffness was drastically reduced, causing the second order effects to gain importance. In spite of the OSF the safety of the element is shown not to be adequate. Upon considering the actual flexibility of the bearing and the large rotations, a reduction of the OSF to neutral equilibrium is explained. Sensitivity and probabilistic analyses are conducted in order to investigate the influence of each parameter and the most likely failure cause. A 90° plan rotation of the bearings would increase stiffness, remarkably reducing the second order effects and would achieve an OSF of 3.99 and a reliability index of 7.9.

    The importance of second order effects has been widely studied in slender concrete structures subjected to compressive stresses, although their effects are not generally taken into account in other fields of structural engineering; this is the case of the overall stability of structures flexible supports, as elastomeric bearing pads. In this paper, the collapse in construction of a 24.9 m span precast concrete Y-beam for the light roof of a sports hall is studied. The roof consisted of a series of these beams simply supported at each end by plain neoprene bearing pads. After a worker had climbed up to the last placed element, the element over-turned producing a partial collapse of the light roof. A simplified analysis, without considering second order effects, indicated that there was an over-turning safety factor (OSF) of 2.67. However, a more detailed analysis showed that with the bearing pad arrangement used, rotational stiffness was drastically reduced, causing the second order effects to gain importance. In spite of the OSF the safety of the element is shown not to be adequate. Upon considering the actual flexibility of the bearing and the large rotations, a reduction of the OSF to neutral equilibrium is explained. Sensitivity and probabilistic analyses are conducted in order to investigate the influence of each parameter and the most likely failure cause. A 90° plan rotation of the bearings would increase stiffness, remarkably reducing the second order effects and would achieve an OSF of 3.99 and a reliability index of 7.9.

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    Estudio sísmico de los edificios agregados de obra de fábrica utilizando el método del espectro de capacidad  Open access

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    Informes de la construcción
    Date of publication: 2014-01
    Journal article

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    Se presenta un estudio sobre el comportamiento sísmico de un conjunto de edificios agregados de obra de fábrica situados en la ciudad de Barcelona, España. Considerando la edad que tienen estos edificios (más de 70 años) se definen dos propiedades mecánicas para la mampostería. La acción sísmica considerada se define a partir del espectro elástico de respuesta definido en el Eurocódigo 8 para la aceleración sísmica de Barcelona. Para analizar los edificios se utiliza el método del espectro de capacidad, a partir del cual se obtienen la curva de capacidad y las curvas de fragilidad para evaluar el daño sísmico esperado. Las matrices de probabilidad de daño cuantifican el daño sísmico y se obtienen a partir de las curvas de fragilidad y el punto de capacidad por demanda. Teniendo en cuenta que Barcelona se encuentra en una zona de baja sismicidad, los resultados obtenidos muestran un daño sísmico importante. In this work a study about the seismic behaviour of a set of masonry aggregates buildings located in the city of Barcelona, Spain, is presented. Considering the age of these buildings (more than 70 years) two mechanical properties for the masonry were defined. The seismic action considered is defined by elastic response spectrum defined by Eurocode 8 for the seismic acceleration of Barcelona. To analyze these buildings the capacity spectrum method was used, from which the capacity curve and the fragility curves are obtained for evaluating the seismic expected damage. Damage probability matrices quantified the seismic damage and they are obtained from the fragility curves and the performance point. Considering that the city of Barcelona is located in an area of low seismicity, the results show an important seismic damage.

    Se presenta un estudio sobre el comportamiento sísmico de un conjunto de edificios agregados de obra de fábrica situados en la ciudad de Barcelona, España. Considerando la edad que tienen estos edificios (más de 70 años) se definen dos propiedades mecánicas para la mampostería. La acción sísmica considerada se define a partir del espectro elástico de respuesta definido en el Eurocódigo 8 para la aceleración sísmica de Barcelona. Para analizar los edificios se utiliza el método del espectro de capacidad, a partir del cual se obtienen la curva de capacidad y las curvas de fragilidad para evaluar el daño sísmico esperado. Las matrices de probabilidad de daño cuantifican el daño sísmico y se obtienen a partir de las curvas de fragilidad y el punto de capacidad por demanda. Teniendo en cuenta que Barcelona se encuentra en una zona de baja sismicidad, los resultados obtenidos muestran un daño sísmico importante. In this work a study about the seismic behaviour of a set of masonry aggregates buildings located in the city of Barcelona, Spain, is presented. Considering the age of these buildings (more than 70 years) two mechanical properties for the masonry were defined. The seismic action considered is defined by elastic response spectrum defined by Eurocode 8 for the seismic acceleration of Barcelona. To analyze these buildings the capacity spectrum method was used, from which the capacity curve and the fragility curves are obtained for evaluating the seismic expected damage. Damage probability matrices quantified the seismic damage and they are obtained from the fragility curves and the performance point. Considering that the city of Barcelona is located in an area of low seismicity, the results show an important seismic damage.

  • Thermo-mechanical simulation of the ConCrack Benchmark RL1 test with a filament beam model

     Santos Ferreira, Denise Carina; Crespo, María Delia; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Engineering structures
    Date of publication: 2014-10-01
    Journal article

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    Cracking is an inherent characteristic of RC structural behaviour and its control is an important concern for durability and sustainability. The French national research program CEOS.fr ¿ `Behaviour and assess- ment of special construction works concerning cracking and shrinkage¿ ¿ has carried out an experimental campaign focused on cracking behaviour. An international benchmark (ConCrack) was organized with the goal of achieving a state of the art on cracking modelling of concrete structures. In this paper, the blind prediction of the RL1 test ¿ large RC beam specimen loaded in bending after free shrinkage ¿ by means of a thermo-mechanical filament beam model is presented. Numerical and experimental results are com- pared in terms of temperatures, strains, displacements and cracking. Predictions of other participating teams involving distinct formulations are also contrasted. Beam elements presented one of the most suc- cessful performances at blind stage, with good predictions at both early age and loading stages. At the feed-back stage, a postdiction analysis was performed with updated parameters. Strain fields developed at early ages affected the mechanical response at mature ages by increasing general damage. Due to its conceptual simplicity and accuracy, the presented model can be a very interesting option for design and assessment stages of complex structural behaviours

    Cracking is an inherent characteristic of RC structural behaviour and its control is an important concern for durability and sustainability. The French national research program CEOS.fr –‘Behaviour and assessment of special construction works concerning cracking and shrinkage’– has carried out an experimental campaign focused on cracking behaviour. An international benchmark (ConCrack) was organized with the goal of achieving a state of the art on cracking modelling of concrete structures. In this paper, the blind prediction of the RL1 test –large RC beam specimen loaded in bending after free shrinkage– by means of a thermo-mechanical filament beam model is presented. Numerical and experimental results are compared in terms of temperatures, strains, displacements and cracking. Predictions of other participating teams involving distinct formulations are also contrasted. Beam elements presented one of the most successful performances at blind stage, with good predictions at both early age and loading stages. At the feed-back stage, a postdiction analysis was performed with updated parameters. Strain fields developed at early ages affected the mechanical response at mature ages by increasing general damage. Due to its conceptual simplicity and accuracy, the presented model can be a very interesting option for design and assessment stages of complex structural behaviours

  • Cortante último en vigas de hormigón armadas con barras FRP sin armadura transversal

     Mari Bernat, Antonio Ricardo; Cladera Bohigas, Antoni; Oller Ibars, Eva; Bairan Garcia, Jesus Miguel
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06
    Presentation of work at congresses

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  • Evaluación de vigas de un puente pretensado con baja armadura transversal mediante un modelo no lineal de filamentos

     Santos Ferreira, Denise Carina; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-05
    Presentation of work at congresses

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  • Resistencia a fuego de pilares esbeltos de hormigón. Evaluación de límites de aplicación del método simplificado de la EHE-08

     Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo; Carrascón, Sergio; Valdez Quezada, Gregorio; Aríñez Fernández, Freddy; Corres Peiretti, Hugo
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Un modelo unificado de resistencia y flexion a cortante de vigas esbeltas de hormigón armado con y sin armadura transversal

     Mari Bernat, Antonio Ricardo; Cladera Bohigas, Antoni; Bairan Garcia, Jesus Miguel; Oller Ibars, Eva; Ribas González, Carlos Rodrigo
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-05
    Presentation of work at congresses

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  • Estudio de los efectos estructurales del deterioro por corrosión de armaduras en estructuras hiperestáticas

     Fernandez Perez, Ignasi; Herrador Barrios, Manuel F.; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Refuerzo por recrecido de regiones D en estructuras de hormigón: análisis experimental

     Menduiña Montero, Raul; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Cálculo de flechas diferidas en estructuras de hormigón armado, parcialmente pretensado y reforzado mediante FRP

     Mari Bernat, Antonio Ricardo; Duarte Gomez, Noemi; Bairan Garcia, Jesus Miguel; Oller Ibars, Eva
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-03
    Presentation of work at congresses

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  • Efectos de la corrosión de las armaduras en su curva tensión-deformación y resistencia a fatiga. Modelo y calibración experimental

     Bairan Garcia, Jesus Miguel; Fernandez Perez, Ignasi; Moreno González, Rosángel; Mari Bernat, Antonio Ricardo; Velázquez Casado, Carlos
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Sobre la necesidad de un tratamiento sostenible y transparente del esfuerzo cortante en normativas basadas en prestaciones. Una propuesta prometedora

     Mari Bernat, Antonio Ricardo; Cladera Bohigas, Antoni; Bairan Garcia, Jesus Miguel
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Control de la fisuración a cortante y flexión mediante pretensado parcial

     Bairan Garcia, Jesus Miguel; Santos Ferreira, Denise Carina; Duarte Gomez, Noemi; Mari Bernat, Antonio Ricardo; Celada Blesa, Ulric
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-03
    Presentation of work at congresses

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  • Sobre el cortante en secciones en T y sus mecanismos resistentes

     Celada Blesa, Ulric; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo; Pujol Sanchez, Mireia; Oller Ibars, Eva
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2014-06-04
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  • A model for the nonlinear, time-dependent and strengthening analysis of shear critical frame concrete structures  Open access

     Santos Ferreira, Denise Carina
    Defense's date: 2013-03-22
    Department of Construction Engineering, Universitat Politècnica de Catalunya
    Theses

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    Los modelos de vigas, debido a su simplicidad inherente y eficiencia computacional, pueden ser alternativas adecuadas a complejos modelos de elementos finitos planos y sólidos. Sin embargo, el comportamiento de elementos estructurales de hormigón sometidos a fuertes esfuerzos cortantes, no pueden ser correctamente simulado mediante estos modelos, ya que no consideran los efectos no lineales del cortante y la interacción cortante-flexión. A su vez, la presencia del cortante en el hormigón armado fisurado da lugar a un complejo mecanismo resistente cuya modelización no está aún claramente definida.En esta tesis si propone un modelo de vigas que considera la no linealidad y el comportamiento paso-a-paso en el tiempo de estructuras porticadas de hormigón construidas evolutivamente teniendo en cuenta los efectos del cortante. El modelo se basa en una formulación existente de flexión y está concebido para el análisis de estructuras planas porticadas de hormigón armado (HA) y pretensado sometido a la acción combinada del esfuerzo axil, flexión y cortante. La interacción cortante-flexión si consigue mediante una formulación seccional basada en suposiciones mixtas de cinemática y fuerza. Las características clave del modelo son: (i) a nivel del material el HA se simula mediante una aproximación de fisuración distribuida rotacional; (ii) a nivel de la fibra un procedimiento iterativo garantiza el equilibrio entre el hormigón y la armadura transversal, permitiendo calcular el estado biaxial de tensiones y deformaciones en cada fibra; (iii) a nivel de la sección un patrón de tensiones tangenciales constantes estima la distribución interna de tensiones y deformaciones de cortante y (iv) a nivel del elemento se aplicada la formulación del elemento de viga Timoshenko.De este modo, los aspectos relevantes de la formulación propuesta se resumen en: (i) su capacidad para considerar los efectos del cortante en estados de servicio y últimos; (ii) el procedimiento paso-a-paso en el tiempo permite tener en cuenta la respuesta diferida debido a fluencia y retracción del hormigón, variaciones de temperatura y relajación del pretensado considerando el estado multiaxial de tensiones y deformaciones en las fibras y; (iii) el análisis secuencial permite evaluar los efectos del refuerzo teniendo en cuenta el estado de la estructura antes de la intervención.El modelo se valida mediante ensayos experimentales disponibles en la literatura, así como, a través de una campaña experimental realizada por la autora, demostrando su capacidad para reproducir la respuesta de vigas críticas a cortante. La importancia de incluir la interacción cortante-flexión en el análisis numérico es destacada por medio de la comparación de los resultados con los proporcionados por el modelo básico de flexión. Con el modelo propuesto se estudia la influencia del cortante en la respuesta diferida de vigas dominadas por cortante y flexión. La consideración de los efectos del cortante es relevante en la modelación de la respuesta diferida de vigas de HA con fisuras diagonales y en vigas pretensadas.El modelo propuesto se compara con éxito con los resultados experimentales de una viga dañada a cortante y posteriormente reforzada mediante un recrecido de hormigón y armadura transversal. Adicionalmente, se analiza numéricamente otra solución alternativa de refuerzo basada en estribos pretensados. La importancia de considerar el daño previo de la viga reforzada queda demostrada en la evaluación numérica.Finalmente, se simula la respuesta de un puente pretensado desmantelado con deficiente resistencia a cortante y sometido a ensayos de carga a larga-escala. Son también estudiadas diferentes propuestas de refuerzo basadas en soluciones de pos-tensado. De este modo, se demuestra la capacidad del modelo para determinar la seguridad de estructuras existentes y analizar la eficiencia de las medidas de refuerzo.

    Nonlinear fibre beam models, due to its intrinsic simplicity and computational efficiency, are often an adequate alternative to the complex nonlinear plane and solid FE models for the assessment of entire frame structures. Nevertheless, simulations of structural concrete members undergoing relevant shear stresses cannot be performed by these models, as nonlinear shear effects and shear-bending interaction are neglected. In turn, the presence of shear stresses in cracked reinforced concrete (RC) elements leads to a rather complex resistant mechanism which numerical modelling is neither straightforward nor clearly established. Within this problematic, the formulation proposed in this thesis is an upgrade version of an existent flexural fibre beam model for the time-dependent analysis of segmentally constructed RC frames by taking into account the shear effects. The model is devised for the analysis of 2D RC and prestressed frame elements under combined axial, bending and shear forces. Shear-bending interaction is taken into account by means of a hybrid kinematic/force-based sectional approach. The key characteristics of the proposed model are: (i) at the material level RC is simulated through a smeared cracked approach with rotating cracks; (ii) at the fibre level an iterative procedure guarantees equilibrium between concrete and transversal reinforcement, allowing to compute the biaxial stress-strain state of each fibre; (iii) at the section level a uniform shear stress flow is assumed in order to estimate the internal shear stress-strain distribution and (iv) at the element level, the Timoshenko beam theory takes into account the deformation due to shear. As a result, the relevant attributes of the proposed formulation can be resumed as: (i) its capability for considering shear effects in both service and ultimate levels; (ii) the time step-by-step solution procedure enables taking into account the time-dependent response due to creep and shrinkage of concrete, temperature variations and relaxation of prestressing steel considering the multiaxial stress-strain state of the fibres and; (iii) the sequential type of analysis allows capturing the strengthening effects, accounting for the state of the structure prior to the intervention. The model is validated through experimental tests available in the literature, as well as through an experimental campaign carried out by the author. Accordingly, the capacity of the model to efficiently reproduce the behaviour of shear critical beams is demonstrated. The importance of including shear-bending interaction in the numerical analysis is underlined by comparing the results with the ones provided by the pure flexural basis model. The influence of transversal stresses on the time-dependent response of shear and bending dominant beams is also studied with the proposed model. Considering shear effects in modelling the time-dependent response of diagonally cracked RC and prestressed beams is found to be relevant. The proposed model is successfully used to predict the experimental results of a shear damaged and subsequently strengthened RC beam, available in the literature. An alternative strengthening solution for the damaged beam based on post-tensioned stirrups is numerically analysed. This technique showed to be effective to avoid brittle shear failure allowing for the development of all the flexural capacity of the repaired beam. The importance of considering previous damage in the numerical assessment of strengthened RC beams is revealed. Finally, the response of a dismantled prestressed concrete bridge, with deficient shear resistance, submitted to full-scale tests is successfully simulated with the proposed model. In addition, different strengthening proposals based on post-tensioning measures are studied for this bridge. In this manner, the capacity of the model to determine the safety of existent structures and to analyse the performance of strengthening measures is demonstrated.

    Los modelos de vigas, debido a su simplicidad inherente y eficiencia computacional, pueden ser alternativas adecuadas a complejos modelos de elementos finitos planos y sólidos. Sin embargo, el comportamiento de elementos estructurales de hormigón sometidos a fuertes esfuerzos cortantes, no pueden ser correctamente simulado mediante estos modelos, ya que no consideran los efectos no lineales del cortante y la interacción cortante-flexión. A su vez, la presencia del cortante en el hormigón armado fisurado da lugar a un complejo mecanismo resistente cuya modelización no está aún claramente definida. En esta tesis si propone un modelo de vigas que considera la no linealidad y el comportamiento paso-a-paso en el tiempo de estructuras porticadas de hormigón construidas evolutivamente teniendo en cuenta los efectos del cortante. El modelo se basa en una formulación existente de flexión y está concebido para el análisis de estructuras planas porticadas de hormigón armado (HA) y pretensado sometido a la acción combinada del esfuerzo axil, flexión y cortante. La interacción cortante-flexión si consigue mediante una formulación seccional basada en suposiciones mixtas de cinemática y fuerza. Las características clave del modelo son: (i) a nivel del material el HA se simula mediante una aproximación de fisuración distribuida rotacional; (ii) a nivel de la fibra un procedimiento iterativo garantiza el equilibrio entre el hormigón y la armadura transversal, permitiendo calcular el estado biaxial de tensiones y deformaciones en cada fibra; (iii) a nivel de la sección un patrón de tensiones tangenciales constantes estima la distribución interna de tensiones y deformaciones de cortante y (iv) a nivel del elemento se aplicada la formulación del elemento de viga Timoshenko. De este modo, los aspectos relevantes de la formulación propuesta se resumen en: (i) su capacidad para considerar los efectos del cortante en estados de servicio y últimos; (ii) el procedimiento paso-a-paso en el tiempo permite tener en cuenta la respuesta diferida debido a fluencia y retracción del hormigón, variaciones de temperatura y relajación del pretensado considerando el estado multiaxial de tensiones y deformaciones en las fibras y; (iii) el análisis secuencial permite evaluar los efectos del refuerzo teniendo en cuenta el estado de la estructura antes de la intervención El modelo se valida mediante ensayos experimentales disponibles en la literatura, así como, a través de una campaña experimental realizada por la autora, demostrando su capacidad para reproducir la respuesta de vigas críticas a cortante. La importancia de incluir la interacción cortante-flexión en el análisis numérico es destacada por medio de la comparación de los resultados con los proporcionados por el modelo básico de flexión. Con el modelo propuesto se estudia la influencia del cortante en la respuesta diferida de vigas dominadas por cortante y flexión. La consideración de los efectos del cortante es relevante en la modelación de la respuesta diferida de vigas de HA con fisuras diagonales y en vigas pretensadas. El modelo propuesto se compara con éxito con los resultados experimentales de una viga dañada a cortante y posteriormente reforzada mediante un recrecido de hormigón y armadura transversal. Adicionalmente, se analiza numéricamente otra solución alternativa de refuerzo basada en estribos pretensados. La importancia de considerar el daño previo de la viga reforzada queda demostrada en la evaluación numérica. Finalmente, se simula la respuesta de un puente pretensado desmantelado con deficiente resistencia a cortante y sometido a ensayos de carga a larga-escala. Son también estudiadas diferentes propuestas de refuerzo basadas en soluciones de pos-tensado. De este modo, se demuestra la capacidad del modelo para determinar la seguridad de estructuras existentes y analizar la eficiencia de las medidas de refuerzo.

  • Simulación numérica de los efectos del deterioro y refuerzo en el comportamiento en servicio y seguridad de las estructuras de hormigón

     Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Date of publication: 2013-04-25
    Book chapter

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    Recull dels materials presentats al seminari s 6 del "Cursos avanzados Eduardo Torroja: Evaluación, intervención y mantenimiento de edificios y estructuras del 8 de abril al 11 de junio de 2013"

  • Assessment of prestressed concrete bridge girders with low shear reinforcement by means of a non-linear filament frame model

     Santos Ferreira, Denise Carina; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Structure and infrastructure engineering
    Date of publication: 2013-09-17
    Journal article

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    The safety of existing bridges and the efficiency of strengthening measures can be accurately studied through non-linear numerical models, assisting decisions of dismantle, repair or change of use and avoiding unnecessary or inappropriate interventions. In this ambit, filament beam models due to their inherent simplicity and low computational demand are adequate for the engineering practice. Accordingly, in this paper, the structural assessment of a prestressed concrete bridge presenting low shear reinforcement, the Wassnerwald Viaduct in Switzerland, is presented. The bridge was dismantled due to, among other reasons, not complying with the safety standards related to shear. The girders of the bridge, which were submitted to full-scale in situ load tests, were numerically simulated by means of a non-linear filament beam model considering axial force (N)¿shear (V)¿bending (M) interaction. Hypothetical strengthening solutions for this bridge were also numerically studied: a shear strengthening through vertical prestressing and a bending strengthening through external longitudinal prestressing

    The safety of existing bridges and the efficiency of strengthening measures can be accurately studied through non-linear numerical models, assisting decisions of dismantle, repair or change of use and avoiding unnecessary or inappropriate interventions. In this ambit, filament beam models due to their inherent simplicity and low computational demand are adequate for the engineering practice. Accordingly, in this paper, the structural assessment of a prestressed concrete bridge presenting low shear reinforcement, the Wassnerwald Viaduct in Switzerland, is presented. The bridge was dismantled due to, among other reasons, not complying with the safety standards related to shear. The girders of the bridge, which were submitted to full-scale in situ load tests, were numerically simulated by means of a non-linear filament beam model considering axial force (N)–shear (V)–bending (M) interaction. Hypothetical strengthening solutions for this bridge were also numerically studied: a shear strengthening through vertical prestressing and a bending strengthening through external longitudinal prestressing

  • Numerical simulation of shear-strengthened RC beams

     Santos Ferreira, Denise Carina; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo
    Engineering structures
    Date of publication: 2013-01
    Journal article

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  • Simplified method for the calculation of long-term deflections in FRP-strengthened reinforced concrete beams

     Mari Bernat, Antonio Ricardo; Oller Ibars, Eva; Bairan Garcia, Jesus Miguel; Duarte Gomez, Noemi
    Composites Part B: Engineering
    Date of publication: 2013-02
    Journal article

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    Influencia de los cerramientos de fábrica en el comportamiento sísmico de edificios de hormigón armado  Open access

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    Hormigon y acero
    Date of publication: 2013-05
    Journal article

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    En España, la mayoría de los edificios de hormigón armado son de forjados reticulares y los cerramientos en estos edificios se suelen materializar con paredes de fábrica que rellenan los marcos entre pilares y forjados. Estas paredes no son portantes y, generalmente, no se considera su contribución resistente ante cargas gravitatorias. No obstante, ante acciones laterales (sismo o viento) la existencia o no de estas paredes puede influir en la respuesta de la estructura. El objetivo de este trabajo es conocer la influencia de la tabiquería en la respuesta sísmica. A partir de planos estructurales reales se define un edificio tipo de 8 plantas, se evalúa su capacidad y respuesta sísmica con y sin tabiquería mediante un análisis estático no lineal. Los resultados muestran la influencia de las paredes en el comportamiento de la estructura frente a cargas laterales, tanto en su rigidez como en su capacidad resistente. The seismic behaviour of a very common building typology in Spain, reinforced concrete (RC) frame buildings, is investigated. Usually, divisions in these buildings are made by means of non-bearing masonry infill walls. It is the traditional practice not to consider the contribution of these in the resisting mechanism, especially for gravitational loads. However, under lateral loading, such as wind or earthquake, the existence or not of these infill walls may significantly influence the structural response. The objective of this paper is to know the influence of masonry infill walls in the seismic response of RC buildings. Based on structural details of a series of real drawings, an 8 stories reference building was defined and by means of non-linear static analysis, structural response and capacity with and without infill walls are evaluated. The results shown that infill walls are determinant in the structural behaviour against lateral loads, both in terms of stiffness and resistance.

    En España, la mayoría de los edificios de hormigón armado son de forjados reticulares y los cerramientos en estos edificios se suelen materializar con paredes de fábrica que rellenan los marcos entre pilares y forjados. Estas paredes no son portantes y, generalmente, no se considera su contribución resistente ante cargas gravita- torias. No obstante, ante acciones laterales (sismo o viento) la existencia o no de estas paredes puede influir en la respuesta de la estructura. El objetivo de este trabajo es conocer la influencia de la tabiquería en la respuesta sísmica. A partir de planos estructurales reales se define un edificio tipo de 8 plantas, se evalúa su capacidad y respuesta sísmica con y sin tabiquería mediante un análisis estático no lineal. Los resultados muestran la influencia de las paredes en el comportamiento de la estructura frente a cargas laterales, tanto en su rigidez como en su capacidad resistente. The seismic behaviour of a very common building typology in Spain, reinforced concrete (RC) frame buildings, is inves- tigated. Usually, divisions in these buildings are made by means of non-bearing masonry infill walls. It is the traditional practice not to consider the contribution of these in the resisting mechanism, especially for gravitational loads. However, under lateral loading, such as wind or earthquake, the existence or not of these infill walls may significantly influence the structural response. The objective of this paper is to know the influence of masonry infill walls in the seismic response of RC buildings. Based on structural details of a series of real drawings, an 8 stories reference building was defined and by means of non-linear static analysis, structural response and capacity with and without infill walls are evaluated. The results shown that infill walls are determinant in the structural behaviour against lateral loads, both in terms of stiffness and resistance.

  • Numerical analysis of shear critical RC beams strengthened in shear with FRP sheets

     Santos Ferreira, Denise Carina; Oller Ibars, Eva; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Journal of composites for construction
    Date of publication: 2013-12
    Journal article

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    The objective of this paper is to contribute to the understanding of the shear resisting mechanisms in RC beams shear-strengthened by externally bonded fiber-reinforced polymer (FRP) sheets. For this purpose, a fiber beam model of RC frames subjected to combined normal and shear forces, previously developed by the authors, has been extended to include the response of externally bonded FRP shear reinforcement in a wrapped configuration. No FRP delamination phenomena or tensile strength reductions in the corner zones are taken into account in the model. The numerical results have been compared with eight existing experimental results and the influence of the FRP sheets on the shear strength of the beam has been studied. The effects of the contribution of FRP ratio on the concrete, on the transversal steel strains and stresses, on the longitudinal tensile steel stresses, and on the diagonal compression struts have been analyzed. It is concluded that the presence of FRP reinforcement modifies the inclinations of cracks and struts, the concrete confinement stresses, and other parameters related to the shear response, producing an interaction between the concrete, internal steel, and FRP components of the shear strength.

  • Simulación del comportamiento estructural de la viga de borde en situación de izado

     de la Fuente Antequera, Alberto; Bairan Garcia, Jesus Miguel; Pialarissi Cavalaro, Sergio Henrique
    Date: 2013-05-13
    Report

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  • BIA2012-36848 - PROYECTO BASADO EN PRESTACIONES DE ESTRUCTURAS DE HORMIGON PARCIALMENTE PRETENSADAS. PROPUESTA DE NUEVA METODOLOGIA, VERIFICACION EXPERIMENTAL Y CRITERIOS DE PROYECTO

     Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo; Oller Ibars, Eva; Duarte Gomez, Noemi
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  • Simplified method for the calculation of long-term deflections in FRP-strengthened reinforced concrete beams

     Mari Bernat, Antonio Ricardo; Oller Ibars, Eva; Bairan Garcia, Jesus Miguel; Duarte Gomez, Noemi
    International Symposium on Fiber Reinforced Polymer for Reinforcement Concrete Structures
    Presentation's date: 2013-06-26
    Presentation of work at congresses

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  • Premio Egresado Destacado del INTEC

     Bairan Garcia, Jesus Miguel
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  • Efectos de los esfuerzos cortantes biaxiales en la respuesta sísmica de columnas de hormigón armado  Open access

     Osorio Bustamante, Edison
    Defense's date: 2012-12-14
    Department of Construction Engineering, Universitat Politècnica de Catalunya
    Theses

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    Durante un terremoto, las columnas de hormigón armado pueden verse sometidas a movimientos bidireccionales que pueden afectar su capacidad resistente y ductilidad. Sin embargo, las normas de diseño y evaluación sísmica no aportan recomendaciones explícitas para cuantificar el comportamiento de las columnas bajo dichas cargas. Esta investigación busca contribuir al análisis y cuantificación de los efectos de los esfuerzos cortantes biaxiales en la respuesta sísmica de columnas de hormigón armado. Con este objetivo, se realizó una recopilación del estado del conocimiento orientado a la revisión de los estudios experimentales y las estrategias de modelización numérica disponibles. De los estudios experimentales se concluyó que las columnas bajo cargas laterales bidireccionales ven reducida su capacidad resistente y ductilidad en comparación a las cargadas en una dirección. La deformación lateral del hormigón bajo cargas de compresión se ha estudiado pero no se encontró un modelo de su comportamiento bajo cargas cíclicas. En esta investigación, se estudió el comportamiento de la deformación lateral del hormigón mediante la ejecución de una primera campaña experimental en probetas cilíndricas de hormigón con cargas de compresión uniaxial cíclica. Con este estudio se aportaron curvas experimentales de tensión - deformación longitudinal y lateral con carga monótona y cíclica en hormigones de resistencia normal y alta. A partir de la interpretación de los datos experimentales, se propuso un modelo conceptual del comportamiento de la deformación lateral del hormigón. De forma paralela, se revisó y estudió el comportamiento de la deformación lateral del hormigón en un estado en compresión triaxial con base en resultados experimentales publicados en la literatura. Con las conclusiones de este estudio y el modelo conceptual en compresión uniaxial, se formuló un modelo analítico de la dilatancia del hormigón en compresión cíclica que se implementó en una ecuación constitutiva 3D. Los resultados se verificaron con los datos experimentales del hormigón en diferentes estados de compresión triaxial y diferentes materiales de confinamiento. Con la finalidad de alcanzar el objetivo general de la investigación, se diseñó, implementó y ejecutó una segunda campaña experimental en columnas con cargas unidireccionales y bidireccionales. Diez columnas circulares de hormigón armado se diseñaron y fabricaron con una disposición de armadura transversal insuficiente para que presentaran un nivel de ductilidad baja a media y un fallo por un mecanismo de cortante-flexión. Cuatro de estas columnas, fueron encamisadas con polímeros reforzados con fibras; dos con fibra de carbono (CFRP) y dos con fibra de aramida (AFRP). En los ensayos bajo carga bidireccional, la demanda de deformación en la armadura transversal fue mayor respecto al de carga unidireccional debido a que las deformaciones por esfuerzos cortantes y por la acción de confinamiento se acumulan. Las columnas con menor cuantía de armadura transversal y menor cuantía de FRP presentaron un incremento de la longitud de la rótula plástica. Dentro de esta investigación, se realizaron análisis de las columnas ensayadas con modelo seccional TINSA(Total-Interaction-Nonlinear-Section). El modelo seccional representa el decremento de resistencia y ductilidad y la mayor deformación de los cercos que se presentó en los experimentos con cargas bidireccionales. Por último, los efectos de los esfuerzos cortantes se analizaron a nivel material, seccional y de elemento. Se derivaron expresiones analíticas para considerar los efectos de los esfuerzos cortantes en el diagrama tensión-deformación del hormigón, la relación momento - curvatura y la longitud de la rótula plástica. Las expresiones analíticas encontradas se usaron en un modelo de análisis de rótula concentrada para obtener la curva de capacidad de la columna. Los resultados del modelo se corroboraron con los resultados experimentales de esta investigación.

    During an earthquake, reinforced concrete columns may be subjected to bi-directional displacements undermining their strength and ductility. However, the current codes for the seismic design and assessments of structures do not provide explicit provisions for the quantification of the effects of biaxial shear forces on the seismic response of reinforced concrete columns. This investigation is aimed at contributions to the analysis and quantification of the effects of biaxial shear forces on the seismic response of reinforced concrete columns. With this purpose, a state of the art review about the available experimental studies and numerical modeling strategies was performed. From the experimental studies, it is concluded that both the strength and ductility of the columns subjected to biaxial shear forces are reduced with respect to those subjected to uniaxial shear forces. The lateral deformation of concrete under compressive loads has been studied but has not formulated a model of its behavior under cyclic loading. In this research, a first experimental program on cylindrical concrete specimens subjected to cyclic compression was carried out in order to study the lateral deformation behavior. Experimental longitudinal stress- longitudinal and lateral strain curves, under monotonic and cyclic loading were provided, for normal and high strength concrete specimens. A conceptual model of the lateral behavior of concrete was proposed since interpretation of experimental data. Subsequently, the lateral behavior of concrete under a triaxial compression stress was reviewed and studied based on the experimental results available in the literature. Based on conclusions findings and using the conceptual model for uniaxial compression, an analytical model for the dilatancy of concrete under cyclic compression was formulated, which incorporate the above mentioned phenomena. The model was implemented into a 3D constitutive equation and their results were verified with experimental results under different triaxial stress states and different confinement materials. With the purpose of reaching the general objective of the investigation, a second experimental program on columns subjected to uniaxial and biaxial lateral forces and axial load was performed. Ten reinforced concrete circulars columns were designed and built, with an inadequate transverse reinforcement arrangement, providing insufficient ductility level so that a shear-flexure failure mechanism would take place. With the purpose of studying the behavior of strengthened columns under biaxial loading, four specimens were wrapped with carbon fiber reinforced polymers (FRP): two with carbon fiber (CFRP) and two with aramid fiber (AFRP). Under cyclic biaxial shear loading, the demand of strains in the transverse reinforcement was bigger than uniaxial loading because the strain by shear and the action of confinement were accumulated. The columns with smaller transverse reinforcement ratios and smaller FRP ratios showed increase of plastic hinge length. In this investigation, sectional analyses of the experimental behavior of the columns tested were performed with TINSA (Total-Interaction-Nonlinear-Section). The sectional model reproduces the decrement of strength and ductility as well as the greater strain in the hoops that was experimentally observed under biaxial tests. Finally, the effect of shear forces was analyzed at the material, section and structure levels. Analytical expressions were derived to consider the influence of the shear forces on the concrete stress-strain relationships, moment-curvature diagrams and on the plastic hinge length. The obtained analytical expressions were used in an analysis model of concentrated plastic hinges in order to obtain the capacity curve of the column. The model results were validated by comparing them satisfactorily with the experimental results presented in this investigation.

  • Seismic assessment of the masonry buildings typical of Barcelona using the Risk-UE methodology

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2012
    Journal article

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  • Lateral behavior of concrete under uniaxial compressive cyclic loading

     Bairan Garcia, Jesus Miguel; Osorio Bustamante, Edison; Mari Bernat, Antonio Ricardo
    Materials and structures
    Date of publication: 2012-08-28
    Journal article

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    In reinforced concrete structures under seismic loading, concrete is subjected to compressive cyclic stress. Although cyclic stress¿strain response has been described before, the cyclic behavior of strains in the direction orthogonal to loading has not been characterized yet. Such behavior can be of great importance for evaluating the efficiency of the confinement under cyclic loading. For this purpose an experimental program on cylindrical specimens of concrete strength from 35 to 80 MPa subjected to uniaxial cyclic compression was carried out. Stress versus longitudinal and lateral strains curves have been obtained both for the hardening and softening branches under monotonic and cyclic loading. Governing parameters of the lateral behavior are identified and correlated to describe the response of the lateral strain. Additionally, an analytical model to obtain the lateral deformations of concrete under cyclic uniaxial compression has been formulated and verified experimentally. Finally, some examples are presented in order to illustrate the applicability of the proposed model and its possible incorporation into a 3D constitutive cyclic mode

    In reinforced concrete structures under seismic loading, concrete is subjected to compressive cyclic stress. Although cyclic stress–strain response has been described before, the cyclic behavior of strains in the direction orthogonal to loading has not been characterized yet. Such behavior can be of great importance for evaluating the efficiency of the confinement under cyclic loading. For this purpose an experimental program on cylindrical specimens of concrete strength from 35 to 80 MPa subjected to uniaxial cyclic compression was carried out. Stress versus longitudinal and lateral strains curves have been obtained both for the hardening and softening branches under monotonic and cyclic loading. Governing parameters of the lateral behavior are identified and correlated to describe the response of the lateral strain. Additionally, an analytical model to obtain the lateral deformations of concrete under cyclic uniaxial compression has been formulated and verified experimentally. Finally, some examples are presented in order to illustrate the applicability of the proposed model and its possible incorporation into a 3D constitutive cyclic model.

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    Generación automática de esquemas de bielas y tirantes considerando criterios constructivos  Open access

     Bairan Garcia, Jesus Miguel
    Hormigon y acero
    Date of publication: 2012-04
    Journal article

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    El método de bielas y tirantes (BT) es de gran utilidad en el dimensionamiento a rotura de elementos de hormigón, particularmente en casos de regiones D donde las hipótesis clásicas de vigas y placas no son aplicables. Aunque el método viene recogido en muchas normativas modernas, existen al menos tres aspectos que limitan un uso más extendido en la práctica: no da información en servicio, la selección de esquemas factibles no es trivial en casos complejos y la solución no es única. En este artículo se propone un método que genera esquemas factibles de BT mediante el uso de análisis lineales y criterios de optimización para modificar la distribución de propiedades del material en la región de estudio. No es necesario disponer un armado inicial y permite considerar criterios constructivos; en particular, se aborda el de armado ortogonal. Se incluyen casos de estudio y ofrecen conclusiones y perspectivas futuras. Strut-and-Tie (ST) method is very useful in the Ultimate Limit State design of reinforced concrete elements, particularly in the case of D regions where beam and plate theories cannot be applied. In spite of being included in most modern design codes, there are at least three issues that limit a more extended use of this method in practice: it doesn’t provide information in service, the selection of suitable schemes is not trivial for complex cases and the solution isn’t unique. In this paper a novel method to produce suitable ST schemes is proposed by combining linear elastic analyses and optimization criteria. It is based on suitable modifications of the distribution of elastic parameters in the structural model. Without requiring initial distribution of reinforcement, it is capable of considering constructability conditions, particularly the condition of orthogonal reinforcement layout is considered in this paper. A series of case-studies are presented and analyzed; finally, conclusions are drawn.

  • Numerical simulation of bridges remodeling

     Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel; Moreno, Rosangel; Oller Ibars, Eva; Álvarez, Juan Jesús
    International Conference on Bridge Maintenance, Safety and Management
    Presentation's date: 2012-07-08
    Presentation of work at congresses

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    Many bridges of the current roadway system need to be upgraded to accommodate them to new traffic, geometric or performance requirements. In order to ensure the required levels of serviceability and safety of the bridge, it is necessary to realistically evaluate its structural response before, during and after the intervention. In this paper, a sequential non-linear and time dependent analytical model, capable to reproduce the effects of the modifications needed to adapt the actual bridges to future needs, is presented. The model is applied to the analysis of an actually modified overcrossing in Spain, in which the intermediate piers had to be moved in order to increase the number of lanes of a freeway. Two alternative strengthening solutions are analysed and comparisons between the structure responses in both cases are made, showing the capabilities of the model as a helpful tool for designing efficient remodelling and strengthening solutions.

  • Effects of cyclic biaxial shear loading on the seismic response of RC columns

     Osorio Bustamante, Edison; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo
    World Conference on Earthquake Engineering
    Presentation's date: 2012-09-24
    Presentation of work at congresses

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  • Seismic response of reinforced concrete frames considering the influence of high shear stresses by means of a new numerical model

     Mohr, Stefen; Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo
    World Conference on Earthquake Engineering
    Presentation's date: 2012-09-24
    Presentation of work at congresses

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  • Analysis of remodelled and strengthened concrete bridge structures

     Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel; Moreno González, Rosángel; Alvarez Andrés, Juan Jesús
    fib Symposium: Concrete Structures for Sustainable Community
    Presentation's date: 2012-06-13
    Presentation of work at congresses

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  • Direct optimal design of partially prestressed concrete for controlled cracking or fatigue

     Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo; Duarte Gomez, Noemi
    fib Symposium: Concrete Structures for Sustainable Community
    Presentation's date: 2012-06-11
    Presentation of work at congresses

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  • The contribution of FRP laminates to the shear strength of Externally Bonded Reinforced (EBR) concrete structures

     Oller Ibars, Eva; Pujol Sanchez, Mireia; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel
    Concrete Structures for Sustainable Community
    Presentation's date: 2012-06-13
    Presentation of work at congresses

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    Assessment of the expected seismic damage in the aggregated masonry buildings of the late XIX century of Barcelona, Spain  Open access

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    World Conference on Earthquake Engineering
    Presentation's date: 2012-09-24
    Presentation of work at congresses

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    This paper aims at the evaluation of expected seismic damage of aggregated masonry buildings system, formed by a line of buildings along of the street; real buildings were studied of whom structural drawings were available. Each structure was individually built without any gaps between them, producing interaction among the buildings under lateral loads. Numerical model consists of 7 buildings: 5 in-row with rectangular shape and 2 corners (in the intersection of two streets) with a pentagonal shape. Damage probability matrices were obtained from pushover analysis using the capacity and fragility curves. Seismic hazard is considered for the acceleration of Barcelona. Four damage states were considered: slight, moderate, extensive and complete (collapse). The results showed that aggregated system analysed presents slight damage in a hard soil while very extensive damage occur in soft soil, furthermore, the expected seismic damage is high considering the low seismic action of Barcelona.

  • Numerical simulation of the structural effects of the deterioration in concrete structures

     Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel; Oller Ibars, Eva; Fernández Pérez, Ignasi
    Concrete Structures for Sustainable Community
    Presentation's date: 2012-06-11
    Presentation of work at congresses

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  • Colmena Destacada

     Bairan Garcia, Jesus Miguel
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  • Nonlinear static and dynamic model for the analysis of reinforced concrete frames under high shear forces.

     Mohr, Steffen
    Defense's date: 2011-06-16
    Universitat Politècnica de Catalunya
    Theses

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  • Simulación de la evolución de temperaturas a edades tempranas en una viga de hormigon armado de grandes dimensiones

     Crespo, María Delia; Mari Bernat, Antonio Ricardo; Bairan Garcia, Jesus Miguel; Santos Ferreira, Denise Carina
    Mecánica computacional
    Date of publication: 2011-11-01
    Journal article

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  • Vulnerabilidad sísmica en edificios metálicos

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel; Rodas, Wendel
    Hormigon y acero
    Date of publication: 2011-08-01
    Journal article

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  • Seismic performance analysis of the masonry buildings, typical of the Eixample district of Barcelona

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    Informes de la construcción
    Date of publication: 2011-11
    Journal article

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    Efecto del enrollado y enderezado en las propiedades mecánicas de barras de acero de diámetro medio y grande fabricadas en rollo  Open access

     Bairan Garcia, Jesus Miguel; Mari Bernat, Antonio Ricardo; Ortega, H.; Rosa, Juan Carlos
    Materiales de construcción (Madrid)
    Date of publication: 2011-05-01
    Journal article

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    Las armaduras en rollo ofrecen grandes ventajas logísticas y medioambientales, por lo que tienden a fabricarse en diámetros medios y grandes. La fabricación introduce complejas historias de carga y temperatura produciendo tensiones residuales. En este artículo se presenta un estudio experimental y numérico sobre la incidencia en las propiedades mecánicas de las barras en rollo, principalmente en la ductilidad. La experimentación incluye fases de caracterización de las zonas del núcleo y corona de la barra, y la comparación entre barras rectas y barras enrolladas idénticas enderezadas en condiciones de laboratorio. El estudio numérico se basa en un modelo constitutivo de endurecimiento mixto y permite considerar la geometría real de la barra y las altas temperaturas involucradas. Se identifican los orígenes y distribuciones de las tensiones residuales y los principales efectos que se producen en las propiedades mecánicas. Finalmente, se recomiendan radios de rollos para controlar la pérdida de ductilidad. Reinforcing bars produced in coils offer important logistic and environmental advantages, for this reason there is a tendency to produce them in medium and larger diameters. Fabrication introduces complex load and temperature histories producing residual stresses. This paper presents an experimental and theoretical study of the incidence in the mechanical properties of reinforcing bars manufactured in coils, mainly in terms of ductility. Experimentation included phases of characterization of the core and crown regions of the bar, and comparison of straight bars and identical rolled bars straightened in laboratory conditions. Numerical study is based in a mixed-hardening constitutive model and allows considering the actual geometry of the bar as well as the high temperatures involved. The model identifies the origin and distribution of residual stresses and the main effects in the mechanical properties of the bars. Finally, recommendations are given regarding coil radius in order to control bar ductility.

  • Seismic damage assessment of waffled slabs RC buildings of Barcelona

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    International journal of architectural heritage
    Date of publication: 2011-10-17
    Journal article

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    The seismic damage of waffled-slabs reinforced concrete buildings in the city of Barcelona (Spain) is evaluated using Risk-UE methodology, which enables obtaining fragility curves of the structure in a simplified manner through capacity curves. The seismic hazard is described by means of the reduced 5%-damped elastic response spectrum specific to Barcelona. Capacity curves are obtained using a non-linear static analysis and are used to obtain the performance point and probability damage matrices corresponding to the specified seismic hazard. Four different buildings, representing most typical structure configuration used in the city, are studied based on detailed data from real structures. Despite low-to-moderate seismic hazard in the region, the results show that these buildings present a considerable seismic vulnerability and a relevant expected seismic damage due to its poor expected performance.

  • Predicting the response of FRP-strengthened reinforced-concrete flexural members with nonlinear evolutive analysis models

     Mari Bernat, Antonio Ricardo; Oller Ibars, Eva; Bairan Garcia, Jesus Miguel
    Journal of composites for construction
    Date of publication: 2011-10
    Journal article

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    Análisis del comportamiento sísmico de los edificios de obra de fábrica, típicos del distrito Eixample de Barcelona  Open access

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel
    Informes de la construcción
    Date of publication: 2011-12-15
    Journal article

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    En este trabajo se realiza un estudio para evaluar la vulnerabilidad y el riesgo sísmico de los edificios de obra de fábrica de ladrillo ampliamente existentes en el distrito Eixample de Barcelona, España. Los edificios analizados son reales y se dispone de planos e informes específicos. El análisis del riesgo sísmico se lleva a cabo mediante un método mecánico basado en el Método del Espectro de Capacidad. La demanda sísmica se define a partir del espectro elástico de respuesta definido por el Eurocódigo-8. Las curvas de fragilidad se obtienen a partir de un análisis no lineal, teniendo en cuenta los espectros de capacidad. El daño sísmico esperado se consigue con las matrices de probabilidad de daño. La modelización de los edificios se realiza con el programa TreMuri mediante un modelo de macroelementos. Los resultados obtenidos muestran una vulnerabilidad importante, teniendo en cuenta el escenario sísmico considerado, el riesgo sísmico esperado es alto. // In this work a study about the vulnerability and seismic risk of the unreinforced masonry buildings, widely, existent in the Eixample district of Barcelona, Spain, is carried out. The buildings, here, analyzed are real and detailed structural drawings and reports have been used to model them. The seismic risk is evaluated by means of a mechanical model, based in the Capacity Spectrum Method. The seismic demand is described by elastic response spectrum defined by the Eurocode-8. Fragility curves are obtained from a nonlinear analysis, considering the capacity spectra. Expected seismic damage is gotten with the damage probability matrices. The analysis of the buildings has been performed by TreMuri program by means of a macro-element model. The results shown a considerable vulnerability in this type of buildings, therefore, in spite of the seismic hazard, the expected seismic risk is significant.

  • Manejo de los residuos de construcción y demolición de la comunidad cubana

     Etxeberria Larrañaga, Miren; Pardo Trafach, Patricia Teresa; Garola Crespo, Alvaro; Bairan Garcia, Jesus Miguel
    Participation in a competitive project

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  • Estudio comparativo de los métodos de diseño sísmico basado en fuerzas y desplazamientos aplicados a un edificio de hormigón armado de mediana altura

     Moreno González, Rosángel; Bairan Garcia, Jesus Miguel; Huaman Cevallos, Victor
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    Presentation's date: 2011-10-26
    Presentation of work at congresses

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    Se presenta un estudio comparativo de dos métodos de diseño sismorresistente: Método Basado en Fuerzas y Método Basado en Desplazamientos, aplicados a un edificio porticado de hormigón armado de 6 pisos localizado en España en una zona de alta sismicidad. El edificio es dimensionado por ambos métodos para satisfacer los requisitos de aceleración basal y desplazamiento máximo de la normativa sísmica española. Para evaluar el comportamiento sísmico de ambos diseños se utiliza el Método del Espectro de Capacidad, que permite estimar la respuesta sísmica máxima de la estructura mediante un análisis estático no-lineal a partir del cual se obtienen los espectros de capacidad. Los resultados muestran que la estructura dimensionada mediante el método de las fuerzas no alcanza el nivel de ductilidad considerado y con el método de los desplazamientos alcanza la fuerza y el desplazamiento para la que fue dimensionada.