多跨连续刚构桥梁地震易损性损伤指标计算方法
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摘要
以多跨连续刚构桥梁为例,考虑刚构墩顶约束建立有限元非线性动力分析模型,进行损伤指标计算方法研究及其不确定性分析。研究结果表明,可采用基于柔度法的纤维单元模拟桥墩、非线性连接单元模拟球型支座以及零长度单元模拟桥台;选取相对位移延性比及相对位移量定义桥墩、支座及桥台在地震作用下的破坏状态及对应损伤指标。建立一种基于桥墩弯矩-曲率分析确定不同构件破坏状态、量化其损伤指标并综合考虑地震动和损伤指标不确定性的地震易损性分析方法,该方法可为桥梁地震易损性分析提供参考。
A multi-span and continuous rigid frame bridge was taken as an example, and considering the constraint of rigid frame pier top, the nonlinear finite element model of bridges was modeled and the computational method of damage index and its uncertainty analysis were studied. It is concluded that: the fiber element based on flexibility method, nonlinear connection element and zero-length element are used respectively to simulate the pier, spherical bearing and abutment; the ductility ratio of relative displacement and relative displacement are selected to define failure states of the pier, bearing and abutment and its corresponding damage index under the earthquake action. The seismic fragility analysis method in this paper is based on the moment curvature analysis of piers to determine failure states of different components, quantifying the damage index and take the uncertainties of the seismic oscillation and damage index into consideration can provide reference for seismic fragility analysis of bridges.
A multi-span and continuous rigid frame bridge was taken as an example, and considering the constraint of rigid frame pier top, the nonlinear finite element model of bridges was modeled and the computational method of damage index and its uncertainty analysis were studied. It is concluded that: the fiber element based on flexibility method, nonlinear connection element and zero-length element are used respectively to simulate the pier, spherical bearing and abutment; the ductility ratio of relative displacement and relative displacement are selected to define failure states of the pier, bearing and abutment and its corresponding damage index under the earthquake action. The seismic fragility analysis method in this paper is based on the moment curvature analysis of piers to determine failure states of different components, quantifying the damage index and take the uncertainties of the seismic oscillation and damage index into consideration can provide reference for seismic fragility analysis of bridges.
引文
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[3]吴文朋,李立峰,胡思聪,等.公路桥梁地震易损性分析的研究综述与展望[J].地震工程与工程振动,2017,37(4):85-96.WU Wenpeng,LI Lifeng,HU Sicong,et al.Research review and future prospect of the seismic fragility analysis for the highway bridges[J].Earthquake Engineering and Engineering Dynamics,2017,37(4):85-96.
[4]Tavares D H,Suescun J R,Paultre P,et al.Seismic fragility of a highway bridge in Quebec[J].Journal of Bridge Engineering,2013,18:1131-1139.
[5]CUI Fengkun,ZHANG Haonan,Ghosn Michel,et al.Seismic fragility analysis of deteriorating RC bridge substructures subject to marine chloride-induced corrosion[J].Engineering Structures,2018(155):61-72.
[6]钟剑,庞于涛,曹飒飒,等.基于构件的RC连续梁桥地震体系易损性分析[J].同济大学学报,2015,43(2):193-198.ZHONG Jian,PANG Yutao,CAO Sasa,et al.Seismic fragility methodology for RC continuous bridge based on components corrrelation[J].Journal of Tongji University Science,2015,43(2):193-198.
[7]ZHANG J,HUO Y.Evaluating effectiveness and optimum design of isolation devices for highway bridges using the fragility function method[J].Engineering Structures,2009,31(8):1648-1660.
[8]Nielson B.Analytical fragility curves for highway bridges in moderate seismic zones[D].Atlanta:Georgia Institute of Technology,2005:1-260.
[9]Choi E,DesRoches R,Nielson B.Seismic fragility of typical bridges in moderate seismic zones[J].Engineering Structures,2004(26):187-199.
[10]苑溦.考虑地震动和腐蚀抗力衰减的跨海桥梁抗震性能研究[D].哈尔滨:哈尔滨工业大学,2013.YUAN Wei.Research on seismic performance of coastal bridges considered coupling effects of seismic action and resistance deterioration[D].Harbin:Harbin Industrial University,2013.
[11]李立峰,吴文朋,黄佳梅,等.地震作用下中等跨径RC连续梁桥系统易损性研究[J].土木工程学报,2012,45(10):152-160.LI Lifeng,WU Wenpeng,HUANG Jiamei,et al.Study on system vulnerability of medium span reinforced concrete continuous girder bridge under earthquake excitation[J].China Civil Engineering Journal,2012,45(10):152-160.
[12]郑凯锋,陈力波,庄卫林,等.基于概率性地震需求模型的桥梁易损性分析[J].工程力学,2013,30(5):165-171.ZHENG Kaifeng,CHEN Libo,ZHUANG Weilin,et al.Bridge vulnerability analysis based on probabilistic seismic demand models[J].Engineering Mechanics,2013,30(5):165-171,187.
[13]Nielson B G,Desroches R.Seismic fragility methodology for highway bridges using a component level approach[J].Earthquake Engineering&Structural Dynamics,2007,36(6):823-839.
[14]Choi E.Seismic analysis and retrofit of mid-America bridges[D].Atlanta:Georgia Institute of Technology,2002:1-251.
[15]何双,赵桂峰,马玉宏,等.基于概率地震需求模型的隔震桥梁易损性对比[J].地震工程与工程振动,2014,34(6):1-10.HE Shuang,ZHAO Guifeng,MA Yuhong,et al.Analysis of isolated bridge vulnerability based on probabilistic seismic demand models[J].Earthquake Engineering and Engineering Dynamics,2014,34(6):1-10.
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