Análise numérica e experimental de concreto submetido a esforços de compressão

Abstract

The literature shows that for materials with almost brittle behavior, such as concrete, the simple compression test on prisms will have a lower resistance than higher the height. This work presents a study of the influence of height on concrete prisms and the restriction in the boundary conditions on resistance to axial compression. First, an experimental study was carried out in which concrete prisms with 10 cm sides and variable heights (5, 10, 20 and 40 cm) were molded and ruptured. The tests were conducted in two situations, one with the loading faces restricted by the bonding of a 2 mm thick metal plate and another with the faces the of free specimen by the application of grease on the loading face. The rupture of the test specimens occurred by simple compression, where the cracks were mapped in each test configuration and the loads and deformations were also obtained, through correlation of images. In the second stage of the work, numerical simulations were carried out using the same configurations using the finite element method (FEM) and the discrete lattice element method (LDEM), applied in the commercial software Abaqus / Explicit. To analyze all the results, a statistical analysis was performed for better understanding of results. After the analysis of the results, it is observed that for the test specimen of 40 cm in height the resistance is much smaller, when compared with the test body of 50 cm of height, this for the two conditions of contour. It has also been found that when image correlation is performed correctly, good results are obtained, so that the deformation of the sample can be measured without coming into contact with it and can be measured anywhere on the specimen.