关键词: 混凝土, 损伤行为, 物质点法, 蒙特卡罗模拟方法, 椭圆骨料

Abstract: In order to study the macro mechanical response and damage behaviors of concrete structures, the material point method (MPM) was applied to numerical simulation of elliptical aggregate concrete. Based on the Monte Carlo simulation method and considering the mesostructure of concrete, a method of constructing the meso-geometric model of concrete with random elliptical aggregate was proposed. Then, on the basis of the geometric model, a method of fast establishing the meso-material point model of concrete was proposed. The mechanical behaviors of mortar and aggregate were simulated by elastoplastic damage constitutive model and elastic constitutive model respectively. The numerical model of concrete under uniaxial tension and uniaxial compression was tested by the material point method program. The results show that the simulation results obtained by the material point method were similar with those obtained by the design code and the finite element method. It can be seen that the material point method provides a feasible way for numerical simulation of damage behavior of concrete structures.

Key words: concrete, damage behavior, material point method, Monte Carlo simulation, elliptical aggregate