根据模型试验的成果发现,实际结构混凝土开裂与试件开裂有明显的差异,分析实际结构的受力特点,提出了一种基于应变空间的本构模型和开裂准则。经过与模型试验对比计算,认为对于孔口等复杂结构,采用极限应变作为混凝土开裂准则比采用最大主拉应力准则更合理,在考虑了结构特性后,采用此准则计算结果与试验成果基本一致。

According to test results,the obvious differences between the cracks of a concrete sample and a practical concrete structure are understood,and a constitutive model based on strain space is proposed.The research results show that for orifice structure to take limit strain as crack criterion is more rational than to use maximum principle stress.The computed data adopting proposed criterion are good consistent with the results of experiment. 