轨道交通高架桥预制拼装桥墩的地震易损性分析  

Seismic vulnerability analysis of precast pier in rail transit viaduct

作　　者：葛宁 陈浩 章群[3] 卓为顶 王序 GE Ning;CHEN Hao;ZHANG Qun;ZHUO Weiding;WANG Xu(Nanjing Metro Group Co.Ltd.,Nanjing 210008,China;Nanjing Metro Construction Co.Ltd.,Nanjing 210017,China;The Third Construction Co.Ltd.of China Construction Eighth Engineering Division,Nanjing 210023,China;Nanjing Institute of Technology,Nanjing 211167,China;Southeast University,Nanjing 211189,China)

机构地区：[1]南京地铁集团有限公司,江苏南京210008 [2]南京地铁建设有限责任公司,江苏南京210017 [3]中建八局第三建设有限公司,江苏南京210023 [4]南京工程学院,江苏南京211167 [5]东南大学,南京211189

出　　处：《现代交通与冶金材料》2023年第1期65-70,共6页Modern Transportation and Metallurgical Materials

基　　金：国家重点研发计划项目(2019YFE0119800)。

摘　　要：节段预制拼装技术可加快桥梁建设速度,目前已得到桥梁工程界日益重视。然而,若在城市轨道交通中采用预制桥墩,其拼装接缝对抗震性能的影响必须得到评估。本文提出了预制拼装桥墩的地震易损性评估方法,选取位移延性指标作为评估参数,利用概率地震需求模型进行易损性分析,定义了4种极限损伤状态,用于定量评价混凝土桥墩的损伤状态。同时以南京地铁宁句城际轨道交通预制拼装桥墩为背景,开展了现浇、预制和预制预应力三种桥墩的地震易损性对比研究,理论和试验研究表明,预应力可降低预制桥墩的易损性,在一定范围内预应力轴压比较大的预制桥墩,在强烈地震下更容易生存。研究成果可为中高烈度区的预制桥墩抗震设计提供参考。Segmental precast technology can accelerate bridge construction and has received more attention in bridge industry.However,the impact of interface joints on seismic performance should be evaluated if precast piers are used in rail transit viaduct.A seismic vulnerability assessment method for precast piers is proposed,in which displacement ductility is selected as the evaluation parameter,vulnerability analysis is conducted by probabilistic seismic demand model,and four ultimate damage states are defined to quantitatively evaluate the damage of the concrete bridge piers.Taking the precast piers in the Nanjing Ningju inter-city rail transit as the background,comparative studies on seismic vulnerability of cast-in-place,precast,and precast prestressed pier are carried out in this paper.Theoretical and experimental studies show that prestressing tendon can reduce the vulnerability of precast piers,and the ones with higher axial prestressed pressure in a certain range are more likely to survive in strong earthquake.The presented findings can provide additional input for the design of precast bridge piers in medium to high intensity seismic area.

关 键 词：预制桥墩 地震易损性 城市轨道交通 预应力 

分 类 号：U433.22[交通运输工程—道路与铁道工程] U233