自复位预制节段拼装中空夹层钢管混凝土桥墩地震易损性分析  

Seismic Fragility Analysis of Self-centering Precast Segmental Concrete-filled Double Skin Steel Tubular Piers

作　　者：梁晓 姜浩然 李芳芳 Liang Xiao;Jiang Haoran;Li Fangfang(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjian University,Tianjin 300384,China;Sinopec Nanjing Engineering Co.,Ltd.,Nanjing 210049,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津城建大学,天津市土木建筑结构防护与加固重点实验室,天津300384 [2]中石化南京工程有限公司,南京210049 [3]天津大学,建筑工程学院,天津300350

出　　处：《震灾防御技术》2024年第3期613-628,共16页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(52238012、52278515、52308519);天津市科技计划项目(23JCYBJC00750、23JCQNJC00910)。

摘　　要：为评估自复位预制节段拼装中空夹层钢管混凝土(Concrete-filled Double Skin Steel Tubular,CFDST)桥墩在地震动作用下的易损性,本研究基于现有的低周反复荷载试验数据,采用有限元分析方法,选用墩顶水平位移角和残余位移角2个指标作为评估标准进行定量分析。针对3种不同类型地震动(远场、近场无脉冲和近场有脉冲),分别建立了关于水平位移角和残余位移角2个指标的易损性曲线,并分析了不同损伤指标和地震动类型对其地震易损性的影响。研究结果表明,在自复位预制节段拼装CFDST桥墩地震易损性分析中,仅采用水平位移角作为损伤指标是安全可靠的;相比远场地震动和近场无脉冲型地震动而言,近场脉冲型地震动对自复位预制节段拼装CFDST桥墩的变形和自复位有显著影响。This paper evaluates the seismic vulnerability of self-centering precast segmental concrete-filled double skin steel tubular(CFDST)piers by quantitatively assessing their seismic performance under three types of ground motions:far-field,near-field without pulse,and near-field pulse-like motions,based on existing quasi-static tests.Using finite element analysis,vulnerability curves for the self-centering precast segmental CFDST piers are established based on two damage indices:the horizontal displacement angle and the residual displacement angle.The study analyzes the effects of different damage indices and ground motion types on the vulnerability curves of the self-centering precast segmental CFDST piers.The results indicate that utilizing only the horizontal displacement angle as the damage index is both safe and reliable for the seismic vulnerability analysis of these piers.Additionally,it was found that near-field pulse-like ground motions significantly affect the deformation and self-centering behavior of the self-centering precast segmental CFDST piers compared to far-field and near-field non-pulse-like ground motions.

关 键 词：桥梁抗震 预制节段拼装桥墩 中空夹层钢管混凝土 地震动 地震易损性 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.22[交通运输工程—道路与铁道工程]