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Fast fragility analysis of plan-asymmetric structures considering soil-structure interaction using flexible base 2 degrees of freedom Modal Pushover Analysis (F2MPA)
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.soildyn.2020.106270
Mohammad S. Birzhandi , Amir M. Halabian

Abstract As an alternative to the very time consuming Non-Linear Response History Analysis (NLRHA) approach, this research aimed to employ the F2MPA (Flexibly-supported 2 DOF Modal Pushover Analysis) approach in developing fragility curves of flexibly-supported plan-asymmetric structures. To do this task, the F2MPA approach is employed to approximately calculate the seismic non-linear response of soil-RC plan asymmetric building systems considering the eccentricity and soil structure interaction (SSI) simultaneously with lower computational costs. Using an appropriate hysteretic model, the F2MPA-based IDA (Incremental Dynamic Analysis) procedure, developed in this study, can accurately estimate the seismic response of the superstructure considering stiffness deterioration, strength loss and pinching behavior of RC members. To examine the applicability of the proposed method, an 8-story RC dual lateral load resistant building under an ensemble of near-fault pulse-like events is used. The comparison of the NLRHA-based and F2MPA-based fragility functions showed a good agreement. Considering the time effectiveness of the proposed approximate method (less than the 0.01 of the NLRHA method), the method is found to be very attractive for practical soil-asymmetric structures. Negligence of the SSI effect for a given structure could be taken into consideration if this approximate fragility analysis does not highlight major SSI effects.

中文翻译:

使用柔性基 2 自由度模态推覆分析 (F2MPA) 对考虑土-结构相互作用的平面非对称结构进行快速脆弱性分析

摘要 作为非常耗时的非线性响应历史分析 (NLRHA) 方法的替代方法,本研究旨在采用 F2MPA(柔性支撑 2 DOF 模态推覆分析)方法开发柔性支撑平面非对称结构的脆性曲线。 . 为了完成这项任务,F2MPA 方法被用来近似计算土壤-RC 平面非对称建筑系统的地震非线性响应,同时考虑偏心距和土壤结构相互作用 (SSI),同时计算成本较低。本研究中开发的基于 F2MPA 的 IDA(增量动态分析)程序使用适当的滞后模型,可以准确估计上部结构的地震响应,考虑 RC 构件的刚度退化、强度损失和挤压行为。为了检验所提出方法的适用性,使用了一个 8 层的 RC 双侧向抗荷载建筑物,该建筑物是在近故障类脉冲事件的集合下进行的。基于 NLRHA 和基于 F2MPA 的脆性函数的比较显示出良好的一致性。考虑到所提出的近似方法的时间有效性(小于 NLRHA 方法的 0.01),发现该方法对于实际的土壤非对称结构非常有吸引力。如果这种近似脆性分析没有突出主要的 SSI 效应,则可以考虑忽略给定结构的 SSI 效应。考虑到所提出的近似方法的时间有效性(小于 NLRHA 方法的 0.01),发现该方法对于实际的土壤非对称结构非常有吸引力。如果这种近似脆性分析没有突出主要的 SSI 效应,则可以考虑忽略给定结构的 SSI 效应。考虑到所提出的近似方法的时间有效性(小于 NLRHA 方法的 0.01),发现该方法对于实际的土壤非对称结构非常有吸引力。如果这种近似脆性分析没有突出主要的 SSI 效应,则可以考虑忽略给定结构的 SSI 效应。
更新日期:2020-11-01
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