【摘要】 在借鉴地上结构抗震分析的Pushover方法思想的基础上,提出一种适用于地铁等地下结构抗震分析与设计使用的Pushover分析方法。详细介绍该方法的实施步骤、基本功能与特点,给出适用于该方法的水平荷载分布形式与目标位移的确定方法。该方法能够反映土-结构之间的相互作用;能够进行结构在地震作用下的全过程分析,得到地下结构的能力曲线;目标位移求解原理简单,根据目标位移可以得到结构的地震反应,进而可以对结构在地震作用下的变形与内力进行评估;计算得到的结构能力曲线与地震波的选取关系不大,计算结果具有较好的模拟精度,从而避免对土-结构整体模型进行复杂的动力相互作用分析。结合实际工程与基于黏弹性静-动力统一人工边界的静-动力联合分析方法进行对比研究,验证地下结构Pushover分析方法的可靠性与良好的模拟精度,可以用于地下结构的抗震分析与设计中。更多还原

【Abstract】 Based on the pushover methods for seismic analysis of super-structures, a pushover analysis method for seismic response analysis and design of underground structures is proposed. The implementation procedure, basic functions and special features of the method are introduced in detail, and the solution methods for the distributions of equivalent horizontal inertial acceleration and target displacement are also presented. Dynamic soil-structure interaction can be properly simulated with the method. The full-range seismic response of the structures can be obtained and the capacity spectrum can be calculated with good accuracy. The capacity spectrum has little to do with the choice of seismic waves, thus one may avoid the complicated analysis of dynamic soil-structure interactions. The target displacement can be easily calculated and convenient for use. Seismic response of the structures can be solved from the target displacement, and deformations and internal forces of the structures can then be calculated. Taking a subway station as example, the validity and accuracy of the method are verified by comparing with the static-dynamic coupling analysis method based on a unified viscous-spring artificial boundary. The analysis results have shown that the method is suitable for seismic response analysis and design of underground structures.更多还原