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  • Impact damage identification in composite laminates using vibration testing

     Pérez Martínez, Marco Antonio; Gil Espert, Lluis; Oller Martinez, Sergio Horacio
    Composite structures
    Date of publication: 2014-02
    Journal article

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    Due to the problems arising from impact damage in composite laminates, there is a need to develop fast, accurate, cost-effective and non-destructive testing methods to identify this type of damage at an early stage and thus enhance the service life of composite structures. This paper presents the results of an extensive experimental campaign conducted to investigate the feasibility of using vibration-based meth- ods to identify damages sustained by composite laminates due to low-velocity impacts. The experimental programme included an evaluation of impact damage resistance and tolerance according to ASTM test methods, characterisation of induced damage by ultrasonic testing and quantification of the effects on the vibration response. The damage identification involved the detection, localisation, quantification and estimation of the remaining bearing capacity. Four damage indicators based on modal parameters were assessed by comparing pristine and damaged states. The results allowed for conclusions to be drawn regarding the capability and suitability of each damage indicator, including its ability to detect impact-induced damage, its precision in determining the location of damage, its sensitivity regarding damage extent and pertinent correlations with residual bearing capacity.

  • Experimental assessment of Textile Reinforced Sprayed Mortar strengthening system for brickwork wallettes

     Bernat Maso, Ernest; Escrig Perez, Christian; Aranha, Chrysl Assumpta; Gil Espert, Lluis
    Construction & building materials
    Date of publication: 2014-01-15
    Journal article

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    This work explores the feasibility of strengthening masonry with Textile Reinforced Mortar (TRM) by projecting it to save application time. Nineteen tests on masonry samples strengthened with TRM have been carried out to assess this new application method. Different mortars and fibre grids were considered for studying their influence and applicability with this new technique. Three points bending tests have been performed on the specimens to compare the flexural strength between cases with manually applied mortar (TRM) and sprayed application (TRSM) of the mortar layer. It was noticed that the strengthening mortar has a significant influence on the failure mode. Results show a remarkable (between 2 and 6 times more) productivity increase when using TRSM and a load-bearing capacity rise for the cases with larger grid spacing and projectable mortar when using TRSM instead of TRM. Greater ductility values were also observed for the TRSM cases in comparison with the analogue TRM cases (same grid and mortar). (C) 2013 Elsevier Ltd. All rights reserved.

  • Comparative experimental analysis of the effect caused by artificial and real induced damage in composite laminates

     Pérez Martínez, Marco Antonio; Gil Espert, Lluis; Sanchez Romero, Montserrat; Oller Martinez, Sergio Horacio
    Composite structures
    Date of publication: 2014-06-02
    Journal article

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    This paper presents the results of an extensive experimental campaign aimed to examine the effect upon the vibration response and on the residual load-bearing capacity caused by both: isolated artificially induced interlaminar damage and low-velocity impact induced damage in composite laminates. The experimental programme included modal testing, drop-weight impact testing, ultrasonic inspection, transverse quasi-static loading testing and compression testing conducted on a set of 72 carbon fibre-reinforced composite laminated coupons. Both types of damage caused measurable changes in laminate performance, however marked divergent trends were observed. The results allowed for conclusions to be drawn regarding the adequacy of the artificial damage approach and highlighted the importance and role of other forms of degradation upon damage tolerance of laminated composites containing damage.

  • Analysis of unreinforced and TRM-strengthened brick masonry walls subjected to eccentric axial load

     Bernat Maso, Ernest
    Defense's date: 2014-02-07
    Universitat Politècnica de Catalunya
    Theses

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    Un nombre significant d'edificis estan suportats per murs de càrrega d'obra de fàbrica. La preservació d¿aquestes estructures que s¿utilitzen arreu del món is una alternativa sostenible. No obstant això, hi ha molt poca recerca en relació a la resposta estructural d¿aquests elements particulars si es compara amb altres com les estructures porticades d¿acer o formigó. Per tant, és necessari un major estudi dels murs de càrrega d¿obra de fàbrica com a punt de partida de les actuacions de preservació.Normalment, els murs de càrrega estan subjectes a patrons de càrrega vertical excèntrica, cosa que està relacionada amb la seva resposta estructural complexa. Aquesta resposta es caracteritza pels efectes de flexió de segon ordre degut a l¿excentricitat de la càrrega, per la resposta no linear a compressió de l¿obra de fàbrica i per la seva, pràcticament negligible, resistència a tracció. Per tant, el reforç d¿aquests murs, per tal d¿augmentar-ne la seva capacitat resistent is una alternativa de millora interessant per allargar la seva vida útil.En aquesta tesi s¿ha dut a terme una campanya experimental. Aquesta ha consistit en centenars d¿assaigs de caracterització de les propietats mecàniques dels materials components utilitzats per construir vint-i-nou murs. Nou d¿aquests es van reforçar amb Textile Reinforced Mortar, TRM, i els altres vint van ser assajats sense reforç. Tots van ser sotmesos a compressió excèntrica. L¿estudi dels murs reforçats ha permès analitzar la influència del tipus de morter de reforç, l¿efecte de disposar ancoratges o la dependència de la capacitat resistent en el tipus de malla de fibra utilitzada. S¿ha implementat un micromodel simplificat bidimensional (2D) per analitzar els casos estructurals proposats. Aquesta eina numèrica ha estat validada utilitzant les dades de la campanya experimental. Finalment, s¿han proposat mètodes analítics per calcular la capacitat portant dels murs sense reforç i dels reforçats amb TRM. De forma semblant, s¿han aplicat dos normes actuals, l¿Eurocodi-6 i l¿ACI-530, als casos d¿estudi per tal de comparar-ne els resultats amb els experimentals.Els resultats mostren que el TRM aporta un augment de la capacitat resistent de més del 100% i homogeneïtza la resposta estructural que esdevé més rígida. En relació a les simulacions, el model numèric proposat obté resultats acurats, els quals són millors pels casos de major esveltesa o més excentricitat de la càrrega. Per acabar, els mètodes analítics que es proposen aporten resultats acceptables, els quals s¿ajusten millor als experimentals que els obtinguts aplicant les formulacions de les normatives.

  • IPT2012-0990-310000-Anualitat 2014

     Gil Espert, Lluis
    Participation in a competitive project

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  • Quasi-homothetic transformation for comparing the mechanical performance of planar models in biological research

     Marce Nogue, Jordi; DeMiguel, Daniel; Fortuny Terricabras, Josep; Esteban Trivigno, Soledad de; Gil Espert, Lluis
    Palaeontologia electronica
    Date of publication: 2013-11
    Journal article

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    The potential of Finite Element Analysis (FEA) as an analytical technique in biological research has been widely highlighted in recent years. In spite of its great power, only in the best of circumstances one can compare the behaviour of models that differ in size and shape. Here, a new and easy procedure to scale FE models of plane elasticity is presented for several species of extant bovids that significantly differ in size and morphology. The method is based on the modification of the values of the forces applied by taking into account the particularities of the elasticity plane models (plane strain and plane stress equations) using quasi-homothetic transformations. This approach is shown to be extremely useful when exploring the effect of the shape in front of the strength and the stiffness of vertebrate bone structures. Thus, the quasi-homothetic concept is a new and interesting proposal to be used in plane elasticity models of biological, and specifically of vertebrate, structures which can be modelled as two-dimensional finite element models.

  • Experimental and numerical analysis of bending-buckling mixed failure of brickwork walls

     Bernat Maso, Ernest; Gil Espert, Lluis; Roca Fabregat, Pedro; Sandoval, Cristian
    Construction & building materials
    Date of publication: 2013-06
    Journal article

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    The eccentric in-plane loading of masonry walls involves complex bending performance that includes second-order effects. In this work, a bidimensional (2D) simplified micro-model for the analysis of this type of failure is developed. An experimental investigation based on 20 tests of full-scale unreinforced masonry walls is performed. The tests are characterised by slenderness and load eccentricity. The analytical methods of Eurocode-6 and ACI-530 are compared with experimental data from the present investigation, other experimental results available in the literature and simulation results from the numerical model.

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    Impact damage prediction in carbon fiber-reinforced laminated composite using the matrix-reinforced mixing theory  Open access

     Pérez Martínez, Marco Antonio; Martinez Garcia, Xavier; Oller Martinez, Sergio Horacio; Gil Espert, Lluis; Rastellini Canela, Fernando Gabriel; Flores, Fernando
    Composite structures
    Date of publication: 2013-10-01
    Journal article

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    The impact damage tolerance of fiber-reinforced laminated composite materials is a source of concern, mainly due to internal induced damage which causes large reductions on the strength and stability of the structure. This paper presents a procedure based on a finite element formulation that can be used to perform numerical predictions of the impact induced internal damage in composite laminates. The procedure is based on simulating the composite performance using a micro-mechanical approach named matrix-reinforced mixing theory, a simplified version of the serial/parallel mixing theory that does not require neither the iterative procedure nor the calculation of the tangent stiffness tensor. The numerical formulation uses continuum mechanics to simulate the phenomenon of initiation and propagation of interlaminar damage with no need to formulate interface elements, resulting in a computationally less demanding formulation. To demonstrate the capability of numerical procedure when applied to a low-velocity impact problem, numerical results are compared with the experimental ones obtained in a test campaign performed on 44 laminates specimens subjected to an out-of-plane and concentrated impact event, according to ASTM test method. Results are in good agreement with experimental data in terms of delamination onset and the internal spatial distribution of induced damage.

    The impact damage tolerance of fiber-reinforced laminated composite materials is a source of concern, mainly due to internal induced damage which causes large reductions on the strength and stability of the structure. This paper presents a procedure based on a finite element formulation that can be used to perform numerical predictions of the impact induced internal damage in composite laminates. The procedure is based on simulating the composite performance using a micro-mechanical approach named matrix-reinforced mixing theory, a simplified version of the serial/parallel mixing theory that does not require neither the iterative procedure nor the calculation of the tangent stiffness tensor. The numerical formulation uses continuum mechanics to simulate the phenomenon of initiation and propagation of interlaminar damage with no need to formulate interface elements, resulting in a computationally less demanding formulation. To demonstrate the capability of numerical procedure when applied to a low-velocity impact problem, numerical results are compared with the experimental ones obtained in a test campaign performed on 44 laminates specimens subjected to an out-of-plane and concentrated impact event, according to ASTM test method. Results are in good agreement with experimental data in terms of delamination onset and the internal spatial distribution of induced damage.

  • Flexural reinforcement of concrete with textile reinforced mortar TRM  Open access

     Gil Espert, Lluis; Escrig Perez, Christian; Bernat Maso, Ernest
    Jornada de la Recerca i la Innovació Tecnològica al Campus de la UPC a Terrassa
    Presentation's date: 2013-06
    Presentation of work at congresses

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    This work presents a method of strengthening concrete structures based on textiles of high strength and mortars. The combination of textiles and mortars produces a new composite material of cementitic matrix. This material can be used for the reinforcement of concrete beams under bending loads. We tested several combinations of fibers: glass, PBO, steel and carbon fibers with mortar and we used them to reinforce precast concrete beams. All the specimens were tested with a four-point load test. We discuss the performance of the specimens and we compare the ultimate results with the formulae from FRP code.

    This work presents a method of strengthening concrete structures based on textiles of high strength and mortars. The combination of textiles and mortars produces a new composite material of cementitic matrix. This material can be used for the reinforcement of concrete beams under bending loads. We tested several combinations of fibers: glass, PBO, steel and carbon fibers with mortar and we used them to reinforce precast concrete beams. All the specimens were tested with a four-point load test. We discuss the performance of the specimens and we compare the ultimate results with the formulae from FRP code

  • Bending performance of concrete beams strengthened with textile reinforced mortar TRM

     Gil Espert, Lluis; Escrig Perez, Christian; Bernat Maso, Ernest
    Symposium on Experimental Stress Analysis and Materials Testing
    Presentation's date: 2013-05-24
    Presentation of work at congresses

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    This work presents a method of strengthening concrete structures based on textiles of high strength and mortars. The combination of textiles and mortars produces a new composite material with cementitious matrix. This material can be used for the reinforcement of concrete beams under bending loads. We tested several combinations of fibers: glass, Poliparafenil Benzobisoxazol (PBO), steel and carbon fibers with mortar and we used them to reinforce precast concrete beams. All the specimens were tested with a four-point load test. We discuss the performance of the specimens and we compare the ultimate results with the formulae from FRP codes.

  • Computational and experimental approach of the phenomenology in the impact of a hen eggshell  Open access

     Marce Nogue, Jordi; Pérez Martínez, Marco Antonio; Gil Espert, Lluis; Vila, Bernat; Fortuny, Josep; G. Sellés, Albert; Galobart, Àngel
    International Conference on Computational Mechanics
    Presentation's date: 2013-07-08
    Presentation of work at congresses

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    An impact test of the crash of a hen egg and a computational simulation using Finite Element Analysis (FEA) have been implemented to determine the different types of failure occurred correlating with the values and the stress maps obtained in the computational simulation. The experimental procedure consists in releasing seventeen eggs from a height which determines the incident kinetic energy and hence the incident velocity while a Transitory Analysis was developed to simulate the dynamical impact of the eggshell on the floor. With the results obtained, a newly classification for the types of failure the eggshells was proposed.

    An impact test of the crash of a hen egg and a computational simulation using Finite Element Analysis (FEA) have been implemented to determine the different types of failure occurred correlating with the values and the stress maps obtained in the computational simulation. The experimental procedure consists in releasing seventeen eggs from a height which determines the incident kinetic energy and hence the incident velocity while a Transitory Analysis was developed to simulate the dynamical impact of the eggshell on the floor. With the results obtained, a newly classification for the types of failure the eggshells was proposed.

    Postprint (author’s final draft)

  • Feasibility study of strengthening unreinforced masonry structures with shotcrete and textile

     Aranha, Chrysl Assumpta; Bernat Maso, Ernest; Gil Espert, Lluis; Escrig Perez, Christian
    International Conference on Rehabilitation and Restoration of Structures
    Presentation's date: 2013-02-14
    Presentation of work at congresses

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  • Finite element comparison of 10 orthodontic microscrews with different cortical bone parameters

     Marce Nogue, Jordi; Walter Solana, Andy; Gil Espert, Lluis; Puigdollers Pérez, Andreu
    International journal of oral and maxillofacial implants
    Date of publication: 2013-07-15
    Journal article

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    Purpose: Unlike standard dental implants, the stabilization of orthodontic microscrews removed after treatment is done without osseointegration and achieved by several components: cortical bone thickness (CBT), microscrew geometry, and drilling depth. The purpose of this study was to evaluate 10 different microscrews and the influence of their geometric parameters with different CBT and drilling depths. Materials and Methods: The influence of geometric parameters in cortical bone was analyzed with a series of computational simulations with finite element models to obtain von Mises stresses and deformations in the microscrew when loaded with a perpendicular traction force of 1 N and considering the angle of incidence as a random parameter. Results: There was variability in the angle of incidence, with less clinical influence. Biomechanical parameters such as microscrew diameter, CBT, and drilling depth had significant influences on the results. At a drilling distance of 8 mm, narrow microscrews (Abso Anchor 1.2) showed maximum von Mises stress of 500.698 MPa and maximum deformation in the shank of 0.08549 mm. Microscrews with a diameter of 1.5 mm (Dentaurum, Jeil, Mondeal, Tekka, Spider) showed von Mises stresses ranging from 56.97 to 136 MPa and deformation between 0.0062055 and 0.0476 mm. Microscrews with a diameter of 2.0 mm (Jeil, Mondeal, Tekka) showed von Mises stresses ranging from 17.172 to 54.861 MPa and deformation of 0.000172 to 0.0161 mm. Conclusions: The shape and geometry of an orthodontic microscrew are highly important in its behavior. Optimal characteristics of a microscrew would include a diameter of 2.0 mm, a cylindric shape, a short and wide head, a short and wide shank, and threads of an appropriate size.

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    Self-assessment exercises in continuum mechanics with autonomous learning  Open access

     Marce Nogue, Jordi; Gil Espert, Lluis; Pérez Martínez, Marco Antonio; Sanchez Romero, Montserrat
    Journal of technology and science education
    Date of publication: 2013-03-19
    Journal article

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  • Experimental and analytical study of TRM strengthened brickwork walls under eccentric compressive loading

     Bernat Maso, Ernest; Gil Espert, Lluis; Roca Fabregat, Pedro; Escrig Perez, Christian
    Construction & building materials
    Date of publication: 2013-07
    Journal article

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    The strengthening of load-bearing masonry walls against out-of-plane failure is needed to enhance the life cycle of existing buildings in a sustainable way. In this work, the efficiency of Textile Reinforced Mortar (TRM) for the strengthening of masonry walls is shown by means of an experimental campaign on full scale brick masonry walls. In addition, this campaign has allowed the study of the influence of different mortar and fibre types and the possible benefit of using anchors to improve the connection between the walls and the external reinforcement. The application of TRM has provided an increase of over 100% of the initial load bearing capacity under eccentric axial load. Moreover, a stiffer and more homogeneous behaviour is noticed when TRM is applied. An analytical method to calculate the ultimate axial¿bending combination for TRM strengthened brick masonry walls, in agreement with the experiments, is presented.

    The strengthening of load-bearing masonry walls against out-of-plane failure is needed to enhance the life cycle of existing buildings in a sustainable way. In this work, the efficiency of Textile Reinforced Mortar (TRM) for the strengthening of masonry walls is shown by means of an experimental campaign on full scale brick masonry walls. In addition, this campaign has allowed the study of the influence of different mortar and fibre types and the possible benefit of using anchors to improve the connection between the walls and the external reinforcement. The application of TRM has provided an increase of over 100% of the initial load bearing capacity under eccentric axial load. Moreover, a stiffer and more homogeneous behaviour is noticed when TRM is applied. An analytical method to calculate the ultimate axial–bending combination for TRM strengthened brick masonry walls, in agreement with the experiments, is presented.

  • Structural characterisation of textile ceramic technology used as a curtain wall

     Bernat Maso, Ernest; Gil Espert, Lluis; Roca Fabregat, Pedro; Sarrablo Moreno, Vicenç; Escrig Perez, Christian
    Engineering structures
    Date of publication: 2013-12
    Journal article

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    Textile Ceramic Technology (TCT) is a system composed of ceramic units installed in a grid of steel wires. TCT application as a curtain wall which allows ventilation is expected to be an inexpensive, aesthetic and sustainable solution. In order to use TCT as a curtain wall, experimental research about the mechanical response of hanged TCT panels is required. The main aim of this paper is to present the results of this experimental work. Different loading conditions corresponding to gravity and wind forces have been applied on typical TCT panels and the results point out that TCT is sufficiently mechanically competent to be used as a curtain wall. The application range and limitations are summarised. © 2013 Elsevier Ltd.

  • Aided diagnosis of structural pathologies with an expert system

     Bernat Maso, Ernest; Gil Espert, Lluis
    Advances in structural engineering
    Date of publication: 2013-02
    Journal article

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    Sustainability and safety are social demands for long-life buildings. Suitable inspection and maintenance tasks on structural elements are needed for keeping buildings safely in service. Any malfunction that causes structural damage could be called pathology by analogy between structural engineering and medicine. Even the easiest evaluation tasks require expensive training periods that may be shortened with a suitable tool. This work presents an expert system (called Doctor House or DH) for diagnosing pathologies of structural elements in buildings. DH differs from other expert systems when it deals with uncertainty in a far easier but still useful way and it is capable of aiding during the initial survey 'in situ', when damage should be detected at a glance. DH is a powerful tool that represents complex knowledge gathered from bibliography and experts. Knowledge codification and uncertainty treatment are the main achievements presented. Finally, DH was tested and validated during real surveys.

  • SISTEMA DE INSPECCIÓN A DISTANCIA PARA TORRES ELÉCTRICAS

     Gil Espert, Lluis
    Participation in a competitive project

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  • REVALORACIÓN DE RESIDUOS SECUNDARIOS DE NFU's

     Gil Espert, Lluis
    Participation in a competitive project

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  • Interferometría autorrealimentada para la medición de deformación en materiales estructurales sometidos a cargas dinámicas

     Azcona Guerrero, Francisco Javier; Atashkhooei, Reza; Royo Royo, Santiago; Gil Espert, Lluis; Pladellorens Mallofre, Josep
    Reunión Nacional de Óptica
    Presentation's date: 2012-09-04
    Presentation of work at congresses

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  • A strategy case to facilitate the technology transfer between universities-enterprise

     Sanchez Romero, Montserrat; Gil Espert, Lluis; Segura Vicente, Sonia
    Congresso Científico da Semana Nacional de Ciência e Tecnologia no IFSP
    Presentation's date: 2012-10-18
    Presentation of work at congresses

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  • Optical Feedback Interferometry for Measuring Dynamic Stress Deformation of Beams

     Atashkhooei, Reza; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago; Gil Espert, Lluis
    Internatinal Conference on Vibration Measurements by Laser and Noncontact Techniques and Short Course
    Presentation's date: 2012
    Presentation of work at congresses

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  • New equations and methods for solving the size effects in the comparison of 2D Finite Element Analysis

     Marce Nogue, Jordi; DeMiguel, Daniel; De Esteban Trivigno, Soledad; Gil Espert, Lluis; Fortuny Terricabras, Josep
    Annual Meeting of the Association of Vertebrate Palaeontologists
    Presentation's date: 2012-06-22
    Presentation of work at congresses

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  • Estudio numérico-experimental de la interfaz hormigón-epoxi-FRP para una estructura reforzada sometida a doble corte

     Molina, Maritzabel; Cruz Solis, Juan Jose; Oller Martinez, Sergio Horacio; Barbat Barbat, Horia Alejandro; Gil Espert, Lluis
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2012-02
    Journal article

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  • Numerical-experimental study of the FRP-epoxy-concrete interface for reinforced structures under double shear

     Molina Herrera, Maritzabel; Cruz Solis, Juan Jose; Oller Martinez, Sergio Horacio; Barbat Barbat, Horia Alejandro; Gil Espert, Lluis
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2012
    Journal article

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  • The structural performance of arches made of few vossoirs with dry-joints

     Bernat Maso, Ernest; Gil Espert, Lluis; Marce Nogue, Jordi
    Structural engineering and mechanics
    Date of publication: 2012-12-25
    Journal article

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  • Simulación de los materiales compuestos como refuerzo en estructuras de hormigón armado

     Molina Herrera, Maritzabel
    Defense's date: 2012-01-12
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Evaluación del daño por impacto en laminados de material compuesto mediante la respuesta dinámica

     Pérez Martínez, Marco Antonio
    Defense's date: 2012-02-06
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Evaluación del daño por impacto en laminados de material compuesto mediante la respuesta dinámica

     Pérez Martínez, Marco Antonio; Gil Espert, Lluis; Oller Martinez, Sergio Horacio
    Date of publication: 2012-04-23
    Book

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  • Determinación del daño por impacto. Empresa Gas Natural

     Puigvert Cobos, Francesc; Gil Espert, Lluis
    Date: 2012-10
    Report

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    En este apartado se estudiará la física del problema de impacto.

  • SISTEMA DE INSPECCION A DISTANCIA PARA TORRES ELECTRICAS

     Sanchez Romero, Montserrat; Pérez Martínez, Marco Antonio; Gil Espert, Lluis
    Participation in a competitive project

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  • Bending test of an inflatable structure

     Neagoe, Catalin Andrei; Gil Espert, Lluis
    Date: 2012-05
    Report

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  • Evaluación experimental de un sistema de inspección a distancia para torres eléctricas

     Pérez Martínez, Marco Antonio; Gil Espert, Lluis
    Date: 2012-12-03
    Report

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  • Estudio numérico modal de la torre eléctrica modelo GE: informe técnico

     Gil Espert, Lluis; Pérez Martínez, Marco Antonio
    Date: 2012-01
    Report

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  • Estudio experimental y numérico para la estimación de los modos propios de una barra roscada: informe técnico

     Pérez Martínez, Marco Antonio; Gil Espert, Lluis
    Date: 2012-01
    Report

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    No 2012 – 002. Proyecto SIDTE

  • Skull mechanics and the evolutionary patterns of the otic notch closure in capitosaurs (Amphibia: Temnospondyli)

     Fortuny Terricabras, Josep; Marce Nogue, Jordi; Gil Espert, Lluis; Galobart Lorente, Àngel
    Anatomical record. Advances in integrative anatomy and evolutionary biology
    Date of publication: 2012-05-09
    Journal article

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  • A bridge inspection system with safe evaluation

     Sanchez Romero, Montserrat; Gil Espert, Lluis
    Ingeniería civil sostenible
    Date of publication: 2012
    Journal article

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  • Anclaje, sistema de fijación y procedimiento para postensar armaduras activas de material compuesto

     Puigvert Cobos, Francesc; Gil Espert, Lluis
    Date of request: 2012-06-05
    Invention patent

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    Anclaje, sistema de fijación y procedimiento para postensar armaduras activas de material compuesto, que comprende un casquillo circular (2) de acero con rosca métrica o Dywidag, con un cilindrado interior (3) de diámetro mayor que un tendón (1) de material compuesto de sección circular, unidos tendón (1) y casquillo circular (2) a través de un adhesivo. La zona de adhesión o cilindrado interior puede ser pasante o dejar un tramo del casquillo circular macizo, en función de si la longitud de adhesión es superior o inferior a la longitud mínima de tensado establecida por el grupo hidráulico. El sistema de fijación de un anclaje para postensar armaduras activas de material compuesto comprende una placa de reparto (5), arandela de contacto (6), tuerca de fijación (7, 8) y anclaje.

  • Using reverse engineering to reconstruct tetrapod skulls and analyse its feeding behaviour

     Marce Nogue, Jordi; Fortuny Terricabras, Josep; Gil Espert, Lluis; Galobart Lorente, Àngel
    International Conference on Civil, Structural and Environmental Engineering Computing
    Presentation's date: 2011-09-09
    Presentation of work at congresses

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