Finite Element Modeling of heterogeneous beams considering the viscoelasticity of the cement paste and the elasticity of aggregates
Fernando Martins Ribeiro Filho1; Amanda Araújo da Silva1; Fabiano Campos Macedo2; Francisco Evangelista Júnior3
1 Universidade de Brasília; 2 Universidade de Brasília/ Instituto Federal de Goiás; 3 Programa de Pós-Graduação em Estruturas e Construção Civil, Universidade de Brasília
doi:10.20906/CPS/CILAMCE2017-0799
Resumo
The present work analyzed the time dependent behavior of a three point bending beam using the finite element approach. The initial data was the creep compliance of a cement paste (Jp). Then, a creep test was simulated numerically in which the specimen was composed of a matrix of cement paste in which elastic aggregates were inserted following a particle-size distribution to obtain the creep compliance of the mixture (Jhom). The beam was divided in two zones: a homogenous zone (with compliance Jhom) towards the supports, and a heterogeneous central zone composed of a matrix of cement paste in which aggregates were inserted following a particle-size distribution. Different meshes and different aggregates positioning were analyzed, trying to show their influence on the results. The results showed that with the insertion of aggregates in the cement paste, the beam's displacements, both the initial and the time-dependent ones, significantly decreased. It was also possible to conclude that the distribution of the aggregates inside the viscoelastic matrix is relevant.
Palavras-chave: Viscoelasticity; Finite Elements; Creep Compliance