循环荷载作用下基于隶属度函数的边界面模型  

Bounding surface model based on membership function under cyclic loading

作　　者：王喜刚[1] 扶名福[1] 胡小荣[1] 

机构地区：[1]南昌大学工程力学研究所,江西南昌330031

出　　处：《哈尔滨工程大学学报》2015年第12期1560-1564,共5页Journal of Harbin Engineering University

基　　金：国家863计划资助项目(2007AA091101);国家自然科学基金资助项目(61072092;61101205;61401496)

摘　　要：为了反映土体在循环荷载作用下塑性应变的累积特性和连续性,将隶属度函数引入到边界面模型中,在二维临界土力学模型图基础上,构造了一个新三维空间锥体,利用该锥体建立了加载面与隶属度函数的一一对应关系。根据隶属度函数修正了塑性流动法则,使得模型对最大预应力具有部分记忆功能,并引入损伤参数,推导得到了模糊边界面模型,通过动三轴实验确定了该模型的参数。利用有限元的二次开发功能,将该模型引入到有限元中,得到了模型的数值结果,通过与动三轴实验结果对比,发现两者吻合较好,证明了模型的合理性。A membership function was imported into the bounding surface model to solve accumulated and continuous plastic strain under cyclic loading. A new three-dimensional cone was constructed based on the two-dimensional critical soil model figure. The relationship between the membership function and the loading surface was established based on the new three-dimensional cone. The membership function was used to modify the plastic flow criteria, so that the maximum stress of model was partially memorized; the damage parameters were adopted to deduce a fuzzy bounding surface model. A dynamic triaxial experiment was adopted to determine the parameters of the model. The numerical prediction matches the experiment results, proving the model is reasonable.

关 键 词：循环荷载 模糊边界面模型 隶属度函数 部分记忆 动三轴实验 有限单元法 

分 类 号：TU345[建筑科学—结构工程]