FRCU - GIMCE: Grupo de Investigación de Mecánica Computacional y de Estructuras
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Item Estudio numérico probabilístico de la capacidad resistente de tubos de HRFA con distribución aleatoria de fibras(2023-04-10) Ferrado, Facundo Luis; Escalante, Mario Raúl; Rougier, Viviana CarolinaEn este trabajo, se presenta un estudio numérico para evaluar la capacidad de carga de tubos de HRFA considerando una orientación y distribución de fibras aleatoria. Para ello, se simuló el ensayo de tres aristas a través de un modelo de elementos finitos 3D en combinación con el método de Monte Carlo. Las fibras son representadas como elementos discretos distribuidos aleatoriamente en la masa de hormigón. El fenómeno de arrancamiento es considerado a través de una modificación del modelo constitutivo del acero. Además, se realizó un estudio paramétrico considerando variaciones en el dosaje de fibras y la clase de hormigón. Los resultados mostraron que la aleatoriedad en la distribución y orientación de las fibras afecta significativamente la carga máxima alcanzada con los tubos de HRFA. Sin embargo, esta carga máxima no varía sensiblemente cuando la distribución sigue una función de probabilidad uniforme, siendo la clase de hormigón el parámetro predominante.Item Modelo bi fase del HRFA para el estudio de la influencia de la orientación y distribución de fibras de acero en la resistencia mecánica de tubos de drenaje(Asociación Argentina de Mecánica Computacional, 2019-11-05) Ferrado, Facundo Luis; Escalante, Mario Raúl; Rougier, Viviana CarolinaEn este trabajo se propone un modelo 3D para el estudio probabilístico de la capacidad resistente de tubos de Hormigón Reforzado con Fibras de Acero (HRFA), en el cual el HRFA es considerado como un material bi fase en donde las fibras son representadas como elementos discretos y aleatoriamente distribuidas. La contribución de este trabajo radica en que el modelo así propuesto en combinación con el método de Monte Carlo permite realizar un estudio probabilístico de la capacidad resistente de los tubos, así como también de la influencia que tienen sobre ella, la orientación y distribución de fibras de acero dentro de la masa de hormigón. Para ello, se simula el ensayo de tres aristas normalizado por la norma IRAM 11503, el cual es implementado en una herramienta de análisis por elementos finitos (ABAQUS c ). Se utilizan modelos constitutivos distintos para el hormigón simple y para las fibras. Finalmente, se muestran resultados de las simulaciones a través de tablas de cargas máximas, curvas carga-desplazamiento e histogramas.Item 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 CarolinaThe 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.Item 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 CarolinaHistorically, 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.