基于Ansys的混凝土随机骨料模型及细观力学分析

Random aggregate model and mesomechanics analysis of concrete based on Ansys

基于Ansys平台,采用APDL命令流,对Ansys进行2次开发,实现了从二维随机骨料投放、有限元网格划分,到施加荷载、分析求解,再到结果输出全过程可视化研究,有效避免了建模软件与有限元数值分析软件之间参数传递关系复杂、接口程序编制困难、兼容性差等问题;提出了利用骨料面积参数和布尔运算判断骨料之间的相容性,使建模更为准确、高效和简便,同时也为建立三维随机骨料模型提供了新的思路;采用骨料偏移算法,生成骨料与砂浆基质之间的薄弱界面,方法可靠;采用所提出的方法生成混凝土随机骨料模型,基于损伤力学理论,开展混凝土细观力学研究.结果表明所提出的方法可行且高效.

Based on the Ansys platform and APDL commands flow,the secondary developing function of Ansys is adopted to do visualization research on the whole processes from packing two-dimensional random aggregate,creating finite element(FE)meshes,applying loads,solving,to outputting results;this method has effectively avoided the problems such as the complexity to transfer parameters between modeling software and FE analysis software,the difficulty to compile program interface,and the poor compatibility between two kinds of software.In this paper,the parameter of aggregates’areas and Boolean operation are used to judge the compatibility between aggregates;so that the modeling process is more accurate,efficient and simple;meanwhile,this operation has provided a new thought for generating a three-dimensional random aggregate model.It is reliable to generate the weak interfacial transition zone(ITZ)between cement motor and aggregates by using algorithm of offsetting aggregates;by adopting the method of generating random aggregate model which is proposed in this paper,and based on the theory of damage mechanics;the mesomechanics of concrete has been studied.The research results have verified the feasibility and effectiveness of the method proposed.