近场脉冲地震下半刚接钢框架内填暗竖缝RC墙结构易损性分析

Seismic fragility analysis of partially-restrained steel frame with concealed vertical slits RC infill walls subjected to near-fault earthquake

为研究半刚接钢框架内填暗竖缝RC墙结构(简称"PSRCW"结构)在近场脉冲地震作用下的易损性能,基于增量动力时程分析方法建立了4个按MECE能量谱设计的PSRCW结构在不同性态水平下的地震易损性曲线,重点考察了层数的影响。研究结果表明:在近场脉冲地震作用下,PSRCW结构对应于多遇地震水准达到基本完好(IO)状态的超越概率在2.76%~5.98%之间,偶遇地震水准达到中等破坏(LS)状态的超越概率在16.88%~37.35%之间,罕遇地震水准达到倒塌(C)状态的超越概率在4.86%~39.92%之间。层数对PSRCW结构在近场脉冲地震作用下的易损性曲线有显著影响,随着层数的增加PSRCW结构达到某一性态水平的超越概率也呈增大趋势。

In order to investigate the seismic fragility curve of partially-restrained steel frame with concealed vertical slits RC infill wall （PSRCW） subjected to near-fauh earthquake records with velocity pulse effect, the seismic fra- gility curves of four PSRCW structures designed according to MECE energy spectrum at the different structural per- formance levels were developed based on the incremental dynamic analysis （IDA） method, and the effect of storey number was also considered. The results show that the probability of exceedance at frequent earthquake level for four PSRCW structures reaching the Immediately Occupation （I0） structural performance level ranges from 2.76% to 5.98 %, the probability of exceedance at occasionally earthquake level for four PSRCW structures reaching the Life Safety （LS） structural performance level ranges from 16.88% to 37.35% , and the probability of exceedance at rare earthquake level for four PSRCW structures reaching the Collapse （ C ） structural performance level ranges from 4.86% to 39.92%. Additionally, the storey number has an important influence on the seismic fragility curves of PSRCW structures under near-fauh earthquake records with velocity pulse effect, the probability of exceedance for PSRCW structure reaching certain structural performance level shows an increasing tendency with the increase of storey number.