Abstract
Abstract Concrete is a widespread material all over the world. Due to this material’s heterogeneity and structural complexity, predicting the behavior of concrete structures under extreme environmental conditions is a very challenging task. High temperatures lead to microstructural changes which affect the macrostructural performance. In this context, computational tools that allow the simulation of structures may assist the analysis, by reproducing varied situations of thermal and mechanical loading and boundary conditions. In order to contribute to this scenario, this study proposes a numerical methodology to simulate the thermomechanical behavior of concrete under temperature gradients, through inverse analyses and a user subroutine implemented in Abaqus software. Thermal loading effects were considered as loading data for a damage model. Experimental data available in the literature was adopted for adjustment and validation purposes. The preliminary results presented herein encourage further improvements so as to allow realistic simulations of such an important aspect of concrete’s behavior.
Highlights
According to ASTM (American Society of Tests and Materials), it is possible to define concrete as a composite material, which comprises a binding agent medium in which are incorporated different aggregates
Mazars [2] proposed an isotropic damage model based on a single scalar variable in which the concrete has a damaged elastic behavior
Thelandersson [3] described the thermomechanical response of concrete considering the thermal strain rate as a function of both rate of temperature change and the current state of stress
Summary
According to ASTM (American Society of Tests and Materials), it is possible to define concrete as a composite material, which comprises a binding agent medium in which are incorporated different aggregates. According to Mehta and Monteiro [1], concrete is one of the most widely adopted construction materials, with world consumption of the order of 33 billion tons per year in 2016 In spite of this fact, the prediction of concrete behavior is rather complex, especially under extreme situations such as large displacements and high temperatures. The evaluation of the behavior of concrete when subjected to high temperatures has increasingly aroused the interest of the scientific community In this context, several constitutive models based on the continuum mechanics have been developed with this objective in mind. Mazars [2] proposed an isotropic damage model based on a single scalar variable in which the concrete has a damaged elastic behavior. Pituba and Lacerda [6], on the other hand, admitted concrete as an initially isotropic medium that starts to present plastic deformations, bimodularity and damage-induced anisotropy
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