Comportamento tração-compressão de estacas de concreto convencional e concreto UHPFRC através do software ABAQUS

Abstract

The present work shows the study on the behavior of the concrete C30 and UHPFRC modeled and simulated with the software ABAQUS. The objective is to model within the main mechanical characteristics of both materials, so that the applied models in the ABAQUS software are able to show the elements working as close as possible to reality. The tests count with the addition of Concrete Damage Plasticity for the characterization of the non-linearityof the concrete, and it was used different meshes for soil solids and the stake, being the used meshes Hex and Tet, respectively. The first simulations happen around conventional concrete (C30), it is then analyzed the responses to an displacement applied one meter away of the top of the stake, representing the amplitudes of traction and compression. The results of compression comprehend a characteristic elastic performance with the limit close to expected given the tye of material and following behavioral stipulations already proven by Carreira and Chu (1985) with the linear behavior (elastic) followed by the plastic behavior showing loss of resistance to compression over three times higher than the ones found on C30 in the same conditions, besides, the response tensions of the UHPFRC show better distribution in area and a lower value, like its deformation, that can be down to 25% lower than the C30 until its rupture. The tensile stresses appear in a similar way to both concrete, but, with a difference of internal values and the ones distributed to the ground. The behavior to compression presents itself differently to the two stakes in response to tension, seen that the C30 stake has a stress concentration in the bottom part and shows tension bulbs right underneath it, meanwhile the UHPFRC concrete shows milder and better ditributed tensions along its length.