孔口结构混凝土的开裂准则

摘要

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 concre te sample and a practical concrete structure are understood,and a constitutive m odel based on strain space is proposed.The research results show that for orific e 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.