A Stochastic Two scale Model for Mechanical Properties Analysis of Fiber Reinforced Concrete

Abstract:

Short fiber reinforced concrete (Short FRC) is a kind of composite material with fiber distributed randomly and intricately. Its mechanical properties are based on not only the performance of the concrete matrix, but also its micro constitution. To combine the micro constitution with macroscopic mechanical analysis, a stochastic two scale model for mechanics parameters computation of Short FRC is presented. First, a new model for representative element volume (REV) is further described with some random parameters based on the practical configuration. Then, finite element method FEM model of each REV sample with the same probability distribution is established to calculate. A comparative study is conducted of the experimental results and the results by other classical methods, which demonstrates the presented model is a significant precise way to estimate the elastic constants of Short FRC. Finally, the influences of fiber’s type and volume fraction on the elastic constants of Short FRC are investigated.