计算力学学报2012，Vol.29Issue(4)：589-593,598,6.
混凝土率型内时损伤本构模型
Rate-dependent endochronic damage constitutive model for concrete
摘要
Abstract
Concrete is a type of rate-dependent material. In order to describe the strength and detormanon characteristics of concrete under impact loads,an endochronic damage constitutive model with the effect of strain rate taken into account is proposed. In this model,the elasto-plasticity of concrete is described by endochronic theory,so that the concept of the yield surface is not needed. And the behavior of stiff- ness degeneration due to microcrack propagation is described by damage theory. Based on the dynamic experiments,incremental evolvement law of damage is introduced. The comparison of numerical and ex- perimental results shows that the model can well represent the uniaxial and biaxial dynamic behavior of concrete. Finally,the proposed model is used to analyze a simply supported beam loaded by an impact dis- placement load at the middle of the span. The analyzing result shows that the strain rate dependence of the material can have a great effect on the strength and stiffness of concrete structures subjected to im- pact loads.关键词
混凝土/应变率/内时损伤/本构模型/非线性分析Key words
concrete/strain rate/endochronic damage/constitutive model/nonlinear analysis分类
建筑与水利引用本文复制引用
宋玉普,刘浩..混凝土率型内时损伤本构模型[J].计算力学学报,2012,29(4):589-593,598,6.基金项目
国家自然科学重点基金（90815026）资助项目. （）
