Geometric Modeling and Strain Analysis of Lightweight Concrete Specimens
Amanda Alves1; Rômulo Oliveira1; Flávia Bastos1; Flavio Barbosa1; Michèle Farage1
1 Universidade Federal de Juiz de Fora
doi:10.20906/CPS/CILAMCE2015-0316
Resumo
The study of the resistance of heterogeneous materials, such as concrete, composed of mortar and aggregates, is a common task in Engineering. In the case of concrete made of lightweight aggregates, due to their different characteristics such as density, porosity and water absorption, predicting its mechanical behavior becomes even more challenging. The computer simulation of mechanical tests intends to assist in understanding the behavior of these materials, reducing the apparent expense of experimental analysis, which requires the preparation of many specimens, generating high costs, test time and the instruments deterioration. Geometric modeling, necessary for the computer simulation, is to describe and draw the geometric characteristics of a given object, by a number of methods. Such methods are from the vector calculus, analytic and descriptive geometry, set theory, numerical analysis and matrix mathematics. This paper proposes the improvement of a code in MATLAB for the generation of geometric models of lightweight concrete specimens. This code has as input parameters the relationship between the density matrix and the aggregate, the percentage of aggregate relative to the total weight of the specimen, the diameter and the height of the specimen and data from the grading curve of the aggregates. Then the deformation analysis will be performed in these models, by finite element program, for six types of aggregates, clay and expanded shale, with several tracks of size and density, which are divided into three classes according to their grain size. For these analyzes the mechanical properties of lightweight aggregates that have been predicted as a result of experimental results of the elastic modulus of concrete are used. This prediction was made from previous studies when inverse identification procedures were used for predicting the lightweight aggregate elastic modulus. Authors: Amanda da Silva Franck Alves and Rômulo Murucci Oliveira Advisor: Flávia de Souza Bastos
Palavras-chave: concreto leve; modelagem mecânica; modelagem computacional; elementos finitos; resistência