基于性能的基础隔震钢筋混凝土框剪结构的倒塌可靠度分析

Performance-based Collapse Reliability Analysis ofBase-isolated Frame-wall Structures

摘要:

利用基于性能的结构可靠度分析方法，对基础隔震钢筋混凝土框剪结构进行分析研究。选取20条实际地震动记录，以0.2g为步长对结构地震动参数PGA进行调幅后，建立了140个结构—地震动样本空间。选取上部结构的最大层间位移角、隔震层位移为量化指标，对每一个样本进行动力非线性时程分析后，将结构响应进行统计得到结构在各地震动强度下超越极限破坏状态的概率，将其绘制成基础隔震钢筋混凝土框剪结构的易损性曲线并利用整体可靠度方法分析结构发生倒塌的可靠度指标。该方法直观地反映了结构发生倒塌的概率，为结构的地震损失评估提供依据。

Abstract:

Using the performance-based fragility analysis method, this paper analyzes a base-isolated RC frame-wall structure. This paper selects 20 actual ground motion records with 0.2 g as the step length, adjusts the ground motion parameter PGA, and sets up 140 structure-ground motion sample spaces. The peak inter-story drift ratio of a super structure and the displacement of the isolation layer are then selected as structural performance indices. After dynamic nonlinear time history analysis of each sample, statistics of the structural responses are obtained, and the probability of collapse of the structure beyond each limit damage state is determined. A global reliability method is then used to calculate the collapse reliability indices of the structures and draw them into a base isolation RC frame structural fragility curve. The collapse probability and collapse reliability indices can reflect the performance of base-isolated frame-wall structures and provide a reliable basis for structural earthquake damage assessment.