【摘要】 利用子结构方法对某超大直径圆形地下连续墙场地进行了动力反应分析.介绍了子结构分析方法的基本原理,探讨了主自由度节点的一般选取原则.采用等效线性化方法考虑土体非线性性质,并运用ANSYS参数化设计语言编制了场地土层模型的子结构方法计算分析程序.建立圆形地下连续墙场地计算模型,分别采用3种主自由度节点选取方法对其进行了动力计算分析.通过对比子结构方法和整体方法计算结果,验证了子结构分析计算方法的合理性及有效性.数值分析结果表明,若合理地选择主自由度节点,采用子结构方法可以在保证计算精度的基础上极大地提高计算效率.更多还原

【Abstract】 Using a substructure method,the dynamic response of a project site is analyzed,in which a circular diaphragm wall with a super-large diameter is built.First,the basic principle of substructure method is introduced briefly,and how to select master degree of freedom(DOF) is also discussed.Then,an equivalent linearity method is applied to consider the soil nonlinearity,and a program based on substructure method is compiled by parametric design language in ANSYS for the dynamic response analysis of the soil site.Finally,the finite element model of the soil site with the circular diaphragm wall is established,and the dynamic response of the soil site is computed by using the whole analysis method and the substructure method,in which three selection ways of master DOF are adapted.Through comparing the results obtained from the two methods,the rationality and effectiveness of the substructure method are verified.The numerical results show that selecting master DOF rationally in substructure analysis can greatly improve the calculation efficiency while ensuring the precision.更多还原