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• Experiments on reinforced brick masonry vaulted light roofs

  F. López-Almansa, P. Roca, V. Sarrablo, X. Cahís, J. Canet

  Structural Journal (2010). Vol. 107 (3), pp. 355-363

  
  

  Abstract

  This paper describes structural tests of thin vaults made of reinforced brick masonry. The experiments consist of concentrated loading tests of 14 full-scale laboratory vaults. These vaults are designed to include common situations such as short- to midspan length, low-mid-high rise, rigid-flexible-sliding supports, instantaneous-sustained loading, low-high strength mortar, point-line loading, central-eccentric loading, point-line supports, hinged-clamped supports, symmetric-asymmetric shape, double layer versus single layer reinforcement, and uniaxial-biaxial bending, among others. The tests mainly aim to obtain the collapse loads and to characterize the pre- and post-peak response. The results show satisfactory structural performance, both in terms of ductility and strength. Moreover, it is possible to predict the structural response with numerical models developed specifically for this purpose. Flat specimens were also tested to determine the punching shear strength of the vaults. This work is part of a larger research project aimed at promoting innovative semi-prefabrication techniques for reinforced brick masonry vaulted light roofs.

  Abstract
  This paper describes structural tests of thin vaults made of reinforced brick masonry. The experiments consist of concentrated loading tests of 14 full-scale laboratory vaults. [...]

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• A numerical-experimental method for characterizing recycled asphalt mixtures

  R. Miró, F. Pérez, S. Oller, J. Canet, J. González

  Road materials and pavement design (2008). Vol. 9 (4), pp. 711-730

  
  

  Abstract

  Experimental techniques usually employed in the characterization of conventional mixes are not able to clearly describe some specific properties of the recycled mixes, which are determinant in the material's mechanical response like cracking strength or tenacity. These new specific properties demands new methods of testing to know the really conditioning mechanical variables taking part in the process, so that being able to characterize and design new recycled mixes in an optimum way. In this paper, the direct tensile test is analyzed as a suitable method for evaluating the properties of recycled asphalt mixtures for different percentages of reclaimed asphalt pavement. A constitutive formulation has been developed to simulate the experimental results and can be used in conjunction with the experimental analysis of the recycled asphalt properties to provide an accurate characterization of the material.

  Abstract
  Experimental techniques usually employed in the characterization of conventional mixes are not able to clearly describe some specific properties of the recycled mixes, which [...]

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• Limit analysis of reinforced masonry vaults

  P. Roca, F. López-Almansa, J. Canet, A. Hanganu

  Engineering Structures (2007). Vol. 23 (3), pp. 431-439

  
  

  Abstract

  Reinforced brick masonry has experienced only scarce use as a fully structural material due to, among other reasons, the lack of design criteria and calculation tools allowing a scientific, but also practical, engineering approach to design and assessment. Aiming at contributing to a more widespread use of this material, a simplified method for the ultimate analysis of reinforced masonry arches and cylindrical vaults, based on the lower-bound theorem (or static approach) of plasticity, has been developed. This approach has been satisfactorily validated by comparison with experimental and numerical results obtained by more accurate numerical models.

  Abstract
  Reinforced brick masonry has experienced only scarce use as a fully structural material due to, among other reasons, the lack of design criteria and calculation tools [...]

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• A viscoplastic constitutive model with strain rate variables for asphalt mixtures—numerical simulation

  J. González, J. Canet, S. Oller, R. Miró

  Computational Materials Science (2007). Vol. 38 (4), pp. 543-560

  
  

  Abstract

  The study and development of recycling techniques for pavements is an increasing activity in engineering nowadays. This research line demands a more realistic characterization of the material properties with the aim of simulate the asphalt mixture’s response placed into a multilayered system over granular bases, under dynamic loads, considering also temperature variation or strength reduction for cyclic loads. In order to improve the current formulations, a new viscoplastic model has been developed assuming the strain rate dependency of the material’s response observed in the experimental tests. The strain rate variable affects in a significant way the Young modulus and the viscosity parameter of the model. According to this hypothesis a constitutive equations have been formulated. The mechanical variables involved have been calibrated according to experimental results, developing new expressions for the strain rate dependent parameters. The new viscoplastic model permits us to characterize the material’s response with a few mechanical values, easily obtained from standard laboratory tests. The results obtained show a good approximation to experimental laboratory curves for different rates of loading and temperatures. The model has been applied to simulate the response of a real flexible pavement structure conformed by two asphalt layers over two granular bases, that’s materials with different constitutive behaviors. Experimental tests in the recycled track have been made obtaining the horizontal strain evolution under dynamic load. Different loading rates and temperatures, as well as cracked and continuum pavement responses have been considered in the study. Strains were measured in the interface between the two asphalt layers and simulated using the here proposed model offering a fairly good approximation of the real response observed in the track, although the degree of variation even in the experimental curves is quite high. The results of this study represent a proper base for further developments in structural analysis of pavement layers, considering more complex phenomena, determinant in the long term material’s response, to develop a numerical tool for pavements’ design and lifetime prediction.

  Abstract
  The study and development of recycling techniques for pavements is an increasing activity in engineering nowadays. This research line demands a more realistic characterization [...]

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• Composite material behavior using a homogenization double scale method

  S. Oller, J. Canet, F. Zalamea

  Journal of Engineering Mechanics (2005). Vol. 131 (1), pp. 65-79

  
  

  Abstract

  In this paper, we present a two-scale numerical method in which structures made up of composite materials are simulated. The method proposed lies within the context of homogenization theory and assumes the periodicity of the internal structure of the material. The problem is divided into two scales of different orders of magnitude: A macroscopic scale in which the body and structure of the composite material is simulated, and a microscopic scale in which an elemental volume called a “cell” simulates the material. In this work, the homogenized strain tensor is related to the transformation of the periodicity vectors. The problem of composite materials is posed as a coupled, two-scale problem, in which the constitutive equation of the composite material becomes the solution of the boundary-value problem in the cell domain. Solving various examples found in the bibliography on this subject demonstrates the validity of the method.

  Abstract
  In this paper, we present a two-scale numerical method in which structures made up of composite materials are simulated. The method proposed lies within the context of homogenization [...]

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• Numerical study of the behaviour of concrete reinforced with short fibers

  S. Oller, A. Barbat, J. Canet

  Hormigón y Acero (2004). Vol. 55 (232), pp. 113-123

  
  

  Abstract

  An approach for the short fibers reinforced concrete behavior is presented in this work. A formulation based on a modification of the classical mixing theory to obtain the composite mechanical properties starting from the single compounding characteristics (concrete−short fibers) is developed. Numerical results obtained by means of the finite element method are also shown and the possibilities of using a simplified analytical method in the study of the short fibers reinforced concrete are commented. The development of the work studies the behavior of the concrete reinforced with short fibers and the characteristics that justify its use. It studies the internal balance and the stress transmission mechanism between the concrete and the short fibers as well as the general formulation of the problem and its insertion within the frame of the finite element technique. A brief comment is made on the simplified treatment of the behavior of the concrete reinforced with short fibers and a validation example is presented.

  Abstract
  An approach for the short fibers reinforced concrete behavior is presented in this work. A formulation based on a modification of the classical mixing theory to obtain the [...]

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• Use of dampers and seismic connectors in bridges

  J. Forment, J. Canet, A. Aparicio

  Hormigón y Acero (2000). Vol. 51 (217), pp. 81-100

  
  

  Abstract

  The earthquakes have always represented on of the most dread destructive phenomena, for they affect the last stability of the structures. The modern societies are not prepared any more to accept then as a fatility, and the trend is now to provide, for structures situated in critical seismic zones, specific devices which nullify, or at least reduce the effect of the earthquakes. In this paper we are going to present the effects that the establishment of two similar seismic devices - the dampers and the seismic connectors - produces in different kinds of bridges. 

  Abstract
  The earthquakes have always represented on of the most dread destructive phenomena, for they affect the last stability of the structures. The modern societies are not prepared [...]

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• Damage interpretation in historical masonry vaults and domes. Lessons on the structural response

  P. Roca

  Videos of Plenary Lectures presented at FORM and FORCE - IASS Symposium 2019 and Structural Membranes 2019.

  
  

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• Architecture and structure

  M. Grohmann

  Videos of Plenary Lectures presented at FORM and FORCE - IASS Symposium 2019 and Structural Membranes 2019.

  
  

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• Ancient building masters' Form and Force

  G. Arun

  Videos of Plenary Lectures presented at FORM and FORCE - IASS Symposium 2019 and Structural Membranes 2019.

  
  

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