【摘要】 针对我国地下工程建设项目抗震安全性能设计和评估的需求,并基于目前缺少完善的地下结构抗震分析方法和专门的地下结构抗震设计规范的现状,重点阐述了采用有限元方法进行地下工程数值模拟和分析时需要特别关注的三方面问题:计算范围、土-结构动力相互作用和边界条件。着重分析了有限元网格的划分、土-结非线性接触问题和不同边界条件的适用性,以及这些建模条件对计算结果可靠性的影响。对基于数值手段开展地下工程抗震安全性能的计算、分析和评价,制定地下结构抗震设计规范或规程,可提供有益参考。更多还原

【Abstract】 For lacking of complete seismic analysis methods and special seismic design codes for underground structures,three aspects,namely: calculation range,soil-structure interaction and boundary conditions,to which close attention should be paid when FEM is used to numerically simulate and analyze underground structures during earthquake are elaborated to satisfy the demand for seismic performance design and evaluation of underground projects in China.Discussions are made on finite element meshing,nonlinear soil-structure contact element,the applicability of different boundary conditions and the influence on the results reliability caused by different modeling methods.The research and solution of these problems provide useful references to numerical method based seismic performance calculation,analysis and evaluation,and are also beneficial to establish codes for seismic design of underground structures.更多还原