Análise da resistência à tração do concreto utilizando o LDEM no ambiente ABAQUS

Abstract

When the knowledge of concrete tensile strength is needed, the most common practice is to use indirect tests to achieve a certain value, since these tests are simpler than the direct tensile tests. Besides, with the growing of technology, numerical models for structural analysis have been started to become more relevant, highlighting the necessity of studies to develop this field. Taking this into account, this current study aims to verify if the conditions found in the direct tensile, splitting and flexural tensile tests can be reproduced numerically when applying Lattice Discrete Element Method (LDEM), implemented by Abaqus. The inputs, used in the models, were obtained through the experimental tests. Initially there were made a simulation for the uniaxial compression in concrete cylinders with 100 mm diameter and 200 mm height to gauge the model. There were used a material with variable proprieties, following a Weibull distribution. After that, there were made simulations of direct tensile, splitting and flexural tensile tests. There were used samples of, respectively, 25 mm x 100 mm x 400 mm prismatic, cylindrical of 100 mm diameter and 200 mm height and 100 mm x 100 mm x 400 mm prismatic. The numerical results presented a certain agreement with the experimental studies. The tests of uniaxial compression and splitting tensile had maximum tensions and fault mechanism very close from the practical tests. However, the simulations of direct tensile and flexural tensile need more work and adjustment to obtain a higher representativity of field results.