FRCU - GIMCE: Grupo de Investigación de Mecánica Computacional y de Estructuras

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    Simulation of the three edge bearing test : 3D model for the study of the strength capacity of SFRC pipes
    (Asociación Argentina de Mecánica Computacional, 2018-11-06) Ferrado, Facundo Luis; Escalante, Mario Raúl; Rougier, Viviana Carolina
    The use of SFRC as building material, has been expanding its possibilities beyond conventional applications. Among its new applications, SFRC pipes appear as a new reliable alternative to the common pipes which use steel mesh as reinforcement, due to the structural benefits that mean the fiber addition. In spite of the advances achieved regarding the knowledge of the behavior of SFRC as a structural material, a numerical tool which allows to predict the mechanical response of SFRC pipes is needed,this is due to the complexity of the costly experimental campaigns. In this work the mechanical behavior of SFRC pipes is numerically assessed by means of the simulation of the three edge bearing test (TEBT) according to IRAM 11503 standard through a tridimensional model, which is implemented using a finite element analysis tool. SFRC is considered as an homogeneous material described for a damage-plasticity model which consider different behaviors in tension and compression by means of stress-strain uniaxial curves. These curves are obtained from equations arising from theoretical-experimental developments of other authors. Finally the results of the simulations are shown by means of load-deflection curves, ultimate loads charts and strength distribution diagrams, which are compared with those ones obtained in a experimental campaign carried out by the authors themselves. The results are complemented with some pictures depicting the experimental campaign mentioned above, with both the equipment used during the tests as well as the failure modes of the pipes are shown.
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    Numerical simulation of the three edge bearing test of steel fiber reinforced concrete pipes
    (Asociación Argentina de Mecánica Computacional, 2016-11-11) Ferrado, Facundo Luis; Escalante, Mario Raúl; Rougier, Viviana Carolina
    Historically, steel has been the material chosen to improve the tensile behaviour of concrete. Nowadays, the trending of replacing the traditional reinforcement bars with short and slender fibers randomly distributed in the mass concrete, is growing. This composite material made essentially of common concrete reinforced with discrete fibers is called steel fiber reinforced concrete(SFRC). In this work the mechanical behaviour of SFRC pipes is studied, simulating the diametral compression test called three edge bearing test by means of a 2d model in plane strain state. The SFRC is considered as a homogeneous material and its behaviour is represented through some damage - plasticity model (concrete damage plasticity) which takes into account the progressive reduction in the values of the elastic constants due to plastic strain and damage by means of a stiffness degradation variable. The model assumes that the main two failure mechanisms of the concrete are tensile cracking and compressive crushing, thus, the tensile and compression response is characterized through differentiated uniaxial stress-strain curves. This representation, although simplified, captures the most important features of the concrete response. The equations are solved with a commercial computational package. In addition, and as an alternative for the same problem, a case is addressed in which the SFRC is considered as an equivalent homogeneous material too, although a coupled plastic-damaged model is used where the coupling between plasticity and damage is achieved through a simultaneous solution of the plastic and the damage problem. Finally is presented a modified coupled damaged plasticity model that comes from a modification of the LublinerOller yield criterion from the adoption of a yield function of second degree in the components of the stress tensor. For the coupled damage plasticity the contribution of the fibers is considered through the classic mixture theory according to it is performed a modification of the elastic constants depending on the volumetric contribution of the fibers. Here, the problem is solved using the non-linear finite elements code PLastic Crack dynamic (PLCd) The validity of the numerical tool is performed comparing the results of the simulation with experimental data existing in the literature.