大坝混凝土试件三维细观力学并行计算研究

基于混凝土材料基本特性及其有关试验研究结果,给出了混凝土材料的损伤演化关系、及其抗拉强度和弹性模量的应变率强化定律,建立了既考虑细观损伤弱化又计及应变率强化效应的混凝土非线性有限元静动力学虚功方程。根据FEPG有限元语言的规则,编写了混凝土试件细观静、动力学方程的描述文件及位移、应力场的算法文件,并基于PFEPG软件平台开发了混凝土试件的三维细观数值并行计算程序。利用三维随机骨料随机参数模型对混凝土试件弯折损伤破坏过程进行了细观数值模拟。其计算结果与试验结果相吻合,显示了该算法及所编并行程序的有效性。

PARALLEL COMPUTATION STUDY ON 3D MESO-MECHANICS OF DAM CONCRETE

Based on the primary features and existing experimental results of concrete, the dynamic strength and elastic modulus related to strain rate, as well as a bilinear damage evolution model linked to strain are formulated. The static and dynamic nonlinear equations on the principle of virtual work for concrete specimens are set up as well. The codes for the equations and the proposed iteration algorithm according to the grammar rules of the Finite Element Program Generator (FEPG), and the parallel computation program are finally developed on the platform of the Parallel Finite Element Program Generator (PFEPG) system. Three dimension random aggregate and random mechanics parameter model (RAPM) are applied to numerically simulate the fracture processes of rupture test of dam concrete specimens. The presented algorithm and parallel computing program are verified by the comparison between analytical and experimental results.