高层钢框架Benchmark模型地震易损性分析  

Seismic fragility analysis of the Benchmark model for high-rise steel frames

作　　者：李永梅[1,2] 胡坤坤 孙俊杰 Li Yong-mei;Hu Kun-kun;Sun Jun-je(Chongqing Research Institute of Bejing University of Technology,Chongqing 401121,China;Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学重庆研究院,重庆401121 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《工程抗震与加固改造》2022年第6期1-8,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：重庆市自然科学基金资助项目(CSTB2022NSCQ-MSX1280)。

摘　　要：为了定量评估中、高层建筑抗震性能,以美国FEMA标准确定结构性态点,以基本自振周期对应的谱加速度作为地震动强度指标、最大层间位移角作为损伤指标,给出基于IDA的地震易损性分析方法。并以当前国际结构振动控制的公共平台Benchmark第3阶段20层非线性钢框架结构作为分析模型,考虑地震动输入不确定性,建立该结构损伤与谱加速度指标之间的线性拟合函数关系式,获得结构地震易损性函数,绘制出结构地震易损性曲线,对结构进行抗震性能评估,把握其在各级地震作用下所具有的抗震能力储备。与我国抗震规范、通则作对比,得出大震作用下我国规范、通则最大层间位移角限值偏于保守等结论,为中、高层钢框架结构地震灾害的损失评估和风险预测提供参考依据。In order to quantitatively evaluate the seismic performance of medium and high-rise buildings, the structural performance points are determined according to the American FEMA standard, the spectral acceleration corresponding to the basic natural vibration period is taken as the seismic strength index, and the maximum inter story displacement angle is taken as the damage index, and the seismic fragility method based on incremental dynamic analysis is given. Taking the 20-storey nonlinear steel frame structure of Benchmark Phase 3, a public platform for the current international structural vibration control, as the analysis model, considering the uncertainty of seismic input, the linear fitting function relationship between the structural damage and the spectral acceleration index is established to obtain the structural seismic fragility function, gain the structural seismic fragility curve, and evaluate the seismic performance of the structure, Grasp the seismic capacity reserve under the action of earthquakes at each level. Compared with the seismic code and general rules of China, it is concluded that the maximum inter story displacement angle limit of the code and general rules of China is tend to somewhat conservative. It provides a reference for the loss assessment and hazard forecast of earthquake disaster of middle and high-rise steel frame structures.

关 键 词：高层钢框架 易损性分析 IDA 抗震性能评估 风险预测 

分 类 号：TU311.3[建筑科学—结构工程] TU375.4