近场脉冲型地震动横向激励下附加SCEB双柱式桥墩结构易损性分析  

Fragility Analysis of the Double-column Bent With the SCEB Under Near-field Pulse-like Ground Motions in Transverse Direction

作　　者：董慧慧[1] 李辉[1] 杜修力[1] DONG Huihui;LI Hui;DU Xiuli(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《北京工业大学学报》2023年第5期532-546,共15页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51908325)。

摘　　要：为了研究桥墩结构的震后功能可恢复性,针对附加自复位耗能支撑(self-centering energy dissipation braces,SCEB)双柱式桥墩结构进行基于增量动力分析方法的地震易损性分析,采用最大侧移率和残余侧移率作为性能指标,系统探讨其在近场脉冲型地震动作用下的失效概率.为了对比分析,同时选取60条远场无脉冲型地震动记录对附加SCEB桥墩结构进行了易损性分析.结果表明:在小震作用下,SCEB仅为桥墩结构提供刚度和承载力,在大震作用下还可提供耗能能力,同时可以提供良好的自复位能力;附加SCEB可有效降低桥墩结构在近场脉冲型地震动作用下的失效概率(最大侧移率和残余侧移率),特别是残余侧移率;附加SCEB桥墩结构在近场脉冲型地震动作用下的失效概率大于远场无脉冲型地震动作用下的失效概率.自复位耗能支撑可有效减小桥墩结构的失效概率,提高桥墩结构的抗震性能.To investigate the seismic resilience of the bridge piers,the seismic fragility analysis of double-column bent with additional SCEB was carried out based on incremental dynamic analysis method,and the maximum drift ratio and residual drift ratio were selected as performance indicators to systematically study the failure probability of the bent under near-field pulse-like ground motions.For comparative analysis,60 far-field non-pulse-like ground motion records were also selected.Results show that SCEB only provides stiffness and strength for the bent under minor earthquakes,and it can also provide the stable energy dissipation capacity and good self-centering capacity under major earthquakes.The SCEB can effectively reduce the failure probability(maximum drift ratio and residual drift ratio)of the bent under near-field pulse-like ground motions,especially the residual drift ratio.The failure probability of the double-column bent with SCEB under near-field pulse-like ground motion was greater than that under far-field non-pulse-like ground motion.SCEB can effectively reduce the failure probability of the bent and enhance the seismic performance.

关 键 词：近场脉冲型地震动 自复位耗能支撑 双柱式桥墩 最大侧移率 残余侧移率 易损性分析 

分 类 号：TU37[建筑科学—结构工程]