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Title:: Seismic Resilience Assessment of Long-span,Deck Concrete-filled Steel Tube Arch Bridge

作者:: 张季伟¹; 2; 杜轲¹; 2; (1.中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨 150080; 2.地震灾害防治应急管理部重点实验室,黑龙江哈尔滨 150080)

Author(s):: ZHANG Jiwei¹; 2; DU Ke¹; 2; (1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)(2.Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,Heilongjiang,China)

Keywords:: long-span; deck CFST arch bridge; nonlinear structural response analysis; performance group; seismic resilience index; seismic resilience rating

摘要:: 为评估大跨度上承式钢管混凝土(Concrete-filled Steel Tube,CFST)拱桥在不同地震动强度下的抗震韧性,以一座320 m上承式CFST拱桥为研究对象,利用Midas/Civil软件建立结构有限元模型并进行非线性结构响应分析,定义了拱桥的易损性组和性能组,开展地震易损性分析,分别评估在不同地震动强度作用下拱桥结构的维修费用和维修时间等抗震韧性指标,给出拱桥的抗震韧性评级方法和依据。结果表明:该结构最终抗震韧性评级为一星,其中维修时间是影响拱桥结构综合抗震韧性等级的关键指标,结构构件对拱桥结构的抗震韧性有较大的影响。

Abstract:: As a common type of highway bridge in China,the long-span,deck concrete-filled steel tube(CFST)arch bridge is greatly affected by earthquake disasters.In order to evaluate its seismic resilience subjected to different earthquake intensities,a 300-meter long,deck CFST arch bridge was studied.Midas/Civil software was used to establish the finite element model of the structure to analyze the structure's nonlinear structural response.The “fragility group” and the “performance group” of the arch bridge were defined,to analyze the bridge's seismic fragility.The seismic resilience indexes for the bridge—maintenance cost and maintenance time—were evaluated respectively according to different ground motion intensities.The method and basis of seismic resilience rating for arch bridges were given according to the Standard for Seismic Resilience Assessment of Buildings(GB/T 38591-2020f).The seismic resilience of the bridge is rated as “one star”,in this case the maintenance time is the key index affecting the comprehensive seismic resilience grade of the bridge.Meanwhile,the structural components significantly influence the seismic resilience of the bridge.