零屈服应力下混凝土三轴受压塑性模型  

A plastic constitutive model for concrete with zero value of initial yield stress under triaxial compressive loading condition

作　　者：李京爽[1] 王哲[2] 邢义川[3] 

机构地区：[1]中国水利水电科学研究院岩土所,北京100044 [2]北京交通大学土木建筑工程学院,北京100044 [3]中国水利水电科学研究院,北京100044

出　　处：《哈尔滨工业大学学报》2009年第4期173-176,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金重点资助项目(50139010);国家自然科学基金面上资助项目(50479044)

摘　　要：为了模拟混凝土真三轴压缩的力学性质,在分析混凝土真三轴和常规三轴压缩试验结果基础上,以经典塑性力学为理论基础,建立了混凝土的真三轴本构模型.模型考虑了混凝土初始屈服强度为0的实验特性,采用4参数的Hsieh-Ting-Chen作为破坏准则,假定材料强化和软化符合各向同性和非相关联的塑性流动法则,并将混凝土压缩实验中的扩容和塑性功相联系起来,把lode角引入塑性势函数中.模型与两种不同配比的混凝土立方体试件分别在6组不同加载路径下的试验结果进行了验证.In order to model the behavior of concrete under genuine triaxial compression, a plastic constitutive model is constructed on the data analysis of conventional and genuine triaxial compressive experiments on con- crete. In this model, the zero value of initial yield stress is considered, the four - parameter Hsieh - Ting - Chen failure criterion is accepted, and the hardening and softening of materials are assumed to obey the isotropic rule and the non - associated flow rule. The dilation is related to plastic work, and the lode angle is introduced in the plastic potential function. This model is validated against conventional and genuine triaxial compressive experiments conducted on cubic concrete specimens of two different mix proportions, in which six groups of monotonous proportional compression test are included in each proportion.

关 键 词：混凝土 本构关系 非相关流 塑性 扩容 真三轴 

分 类 号：U452[建筑科学—桥梁与隧道工程]