基于多尺度分析的混凝土随机损伤本构关系

通过多尺度能量积分与能量损伤表达建立宏-细观尺度之间的联系,即混凝土宏观尺度的损伤演化可以通过细观单元的分析获得.根据随机细观单元的数值分析结果,积分得到基本细观单元能量的演化,分别计算受拉与受剪损伤的演化曲线.建议了实用的损伤演化公式,并基于基本单元分析获得随机损伤发展参数的均值、标准差及其概率密度分布.混凝土宏观试验的模拟结果验证了多尺度随机损伤本构模型的正确性.

A multi-scale analysis based stochastic damage model of concrete

The relationship between mesoscopic and macroscopic material properties are presented based on the multi-scale method. It is equal to say that the macroscopic damage evolution can bee obtained from the micro-cell simulation results. Then, two kinds of typical micro-cells are generated for the macroscopic tensile and shear damage evolution. To apply the damage evolution from the micro-cell analysis to the engineering simulations, a pragmatic damage evolution law is put forwards for the tensile and shear damage and the damage evolution parameters can be obtained. Comparison between simulation and the experimental results are given to testify the validity of the present model. It is demonstrated that the model agrees well with the experimental results.