ABSTRACT

Pushover analysis as an efficient nonlinear static analysis method has been widely applied to the seismic inelastic performance evaluation of above-ground structures. Although it has the main advantage of high computational efficiency compared to nonlinear dynamic time-history analysis (THA), the assumption that the fundamental mode dominates structural response limits its application to long-period structures. Improved pushover analysis has been developed to consider the higher mode effect, named modal pushover analysis (MPA), but all research mainly focused on buildings and bridges. Since the mechanical behaviors of the underground structures and above-ground structures under seismic exaction are not exactly the same, so far, MPA suitable for seismic performance assessment of underground structures still has not been developed. Therefore, the aim of this investigation is to develop MPA for the seismic performance assessment of underground structures. A prototype subway station structure and a soft site are used to study the applicability of the developed MPA and compare it with the traditional pushover analysis procedure and nonlinear THA. Numerical analysis results of the subway station illustrate the applicability and potential of the developed MPA for underground structures.

摘要

Pushover分析作为一种高效的非线性静力分析方法，被广泛应用于地上结构的抗震非弹性性能评价。尽管与非线性动态时程分析 (THA) 相比，它具有计算效率高的主要优势，但基模主导结构响应的假设限制了其在长周期结构中的应用。已开发改进的 Pushover 分析以考虑更高模态效应，称为模态 Pushover 分析 (MPA)，但所有研究主要集中在建筑物和桥梁上。由于地下结构和地上结构在地震作用下的力学行为并不完全相同，因此迄今为止，还没有开发出适用于地下结构抗震性能评估的MPA。所以，本次调查的目的是开发用于地下结构抗震性能评估的 MPA。原型地铁站结构和软场地用于研究开发的 MPA 的适用性，并将其与传统的 Pushover 分析程序和非线性 THA 进行比较。地铁站的数值分析结果说明了开发的 MPA 在地下结构中的适用性和潜力。