基于概率地震需求模型的隔震桥梁易损性对比
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摘要
目前,通常采用确定性方法对桥梁隔震效果进行分析,即通过隔震与非隔震地震响应进行对比得到隔震效果;而概率方法对隔震桥梁进行分析时又大多仅分析其失效概率,很少从失效概率的角度开展隔震与非隔震桥梁对比研究。本文利用概率性地震需求分析模型分别对隔震与非隔震连续梁桥进行了地震易损性分析。在考虑桥梁结构及地震动参数随机性的基础上,以墩柱位移延性比和支座相对位移比作为破坏指标,定义并量化了隔震与非隔震桥梁桥墩和支座的五种极限破坏状态。利用传统可靠度概率分析方法通过非线性时程分析生成了桥墩和支座的易损性曲线,对比分析了隔震与非隔震桥梁墩柱和支座在不同破坏状态下的超越概率。研究结果表明:从易损性对比的角度分析,相比于非隔震连续梁桥,隔震连续梁桥在地震动作用下表现出了较好的抗震性能,各破坏状态下构件的超越概率较小。
Nowadays,definitive method is adopted to analyze the bridge isolation effect by the comparison between isolated and non-isolated earthquake response; the comparison between isolated and non-isolated bridge analysis is rarely researched from the scale of failure probability,which is analyzed when probability method is used to analyze the isolated bridge. The seismic vulnerability analysis of the isolated and non-isolated continuous girder bridge are developed by using probabilistic seismic demand models. Considering the random of bridge structure and ground motion parameter,five different kinds of ultimate damage states of pier and bearing are defined and quantified,in which the displacement ductility ratio of pier and relative displacement ratio of bearing are the damage indexes. The vulnerability curves are generated by the use of the traditional reliability probability method throughout nonlinear transient analysis,and the exceeding probability of pier and bearing in isolated and non-isolated bridge under different damage states is analyzed. The result shows that compared with the non-isolated bridge,the isolated bridge has better anti-seismic property under earthquake effect and the exceeding probability of the components is smaller under different damage conditions from the perspective of vulnerability.
Nowadays,definitive method is adopted to analyze the bridge isolation effect by the comparison between isolated and non-isolated earthquake response; the comparison between isolated and non-isolated bridge analysis is rarely researched from the scale of failure probability,which is analyzed when probability method is used to analyze the isolated bridge. The seismic vulnerability analysis of the isolated and non-isolated continuous girder bridge are developed by using probabilistic seismic demand models. Considering the random of bridge structure and ground motion parameter,five different kinds of ultimate damage states of pier and bearing are defined and quantified,in which the displacement ductility ratio of pier and relative displacement ratio of bearing are the damage indexes. The vulnerability curves are generated by the use of the traditional reliability probability method throughout nonlinear transient analysis,and the exceeding probability of pier and bearing in isolated and non-isolated bridge under different damage states is analyzed. The result shows that compared with the non-isolated bridge,the isolated bridge has better anti-seismic property under earthquake effect and the exceeding probability of the components is smaller under different damage conditions from the perspective of vulnerability.
引文
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[17]Tavares D H,Padgett J E,Paultre P.Fragility curves of typical as-built highway bridges in eastern Canada[J].Engineering Structures,2012,40(16):107-118.
[18]Specifications for Highway Bridges:Part V.Seismic Design[S].Tokyo:Japan Road Association,2002.
[19]JIG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02-01-2008 Guidelines of Seismic Design of Highway Bridges[S].Beijing:China Communication Press,2008.(In Chinese)
[20]Nielson B G.Analytical fragility curves for highway bridges in moderate seismic zones[D].Atlanta,GA:Georgia Institute of Technology,2005.
[21]Cornell C A,Jalayer F,Hamburger R O,et al.Probabilistic basis for 2000 SAC federal emergency management agency steel moment frame guidelines[J].Journal of Structural Engineering-ASCE,2002,128(4):526-533.
[2]Nielson B G,Desroches R.Seismic fragility methodology for highway bridges[C]∥Proceedings of the 2006 Structures Congress,2006.
[3]李立峰,吴文朋,黄佳梅,等.板式橡胶支座地震易损性分析[J].湖南大学学报,2011,38(11):1-6.LI Lifeng,WU Wenpeng,HUANG Jiamei,et al.Research on the seismic vulnerability analysis of laminated rubber bearing[J],Journal of Hunan Uiv-ersity(Natural Sciences),2011,38(11):1-6.(in Chinese)
[4]于晓辉,吕大刚,王光远.关于概率地震需求模型的讨论[J].工程力学,2013,30(8):172-179.YU Xiaohui,LU Dagang,WANG Guangyuan.Discussions on probability seismic demand models[J].Engineering Mechanics,2013,30(8):172-179.(in Chinese)
[5]郑凯峰,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.(in Chinese)
[6]Park K S,Jung H J,Lee I W.A comparative study on aseismic performance of base isolation systems for multi-span continuous bridge[J].Engineering Structures,2002,24:1001-1013.
[7]Jangid R S.Optimal friction pendulum system for near-fault motions[J].Engineering Structures,2005,27:349-359.
[8]Jangid R S.Optimal lead-rubber isolation bearings for near-fault motions[J].Engineering Structures,2007,29:2503-2513.
[9]龙晓鸿,杨斌斌,樊剑,等.基于响应面法的隔震连续梁桥地震易损性分析[J].地震工程与工程振动,2014,34(2):172-179.LONG Xiaohong,YANG Binbin,FAN Jian,et al.Seismic fragility analysis of isolated continuous girder bridge using response surface method[J].Journal of Earthquake Engineering and Engineering and Engineering Vibration,2014,34(2):172-179.(in Chinese)
[10]Karim K R,Yamazaki F.Effect of isolation on fragility curves of highway bridges based on simplified approach[J].Soil Dynamics and Earthquake Engineering,2007,27:414-426.
[11]Zhang J,Huo Y L.Evaluating effectiveness and optimum design of isolation devices for highway bridges using the fragility function method[J].Engineering Structures,2009,31:1648-1660.
[12]吕大刚,于晓辉,潘峰,等.基于改进云图法的结构概率地震需求分析[J].世界地震工程,2010,20(1):7-15.LU Dagang,YU Xiaohui,PAN Feng,et al.Probabilistic seismic demand analysis of structures based on an improved cloud method[J].World Earthquake Engineering,2010,20(1):7-15.(in Chinese)
[13]Hwang H,.Liu J B,Chiu Y H.Seismic fragility analysis of highway bridges[R].Memphis:Mid-Ameirica Earthquake Center,2001.
[14]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 under earthquake excitation[J].China Civil Engineering Journal,2012,45(10):152-160.(in Chinese)
[15]Shinozuka M,Feng M Q,Lee J,et al.Statistical analysis of fragility curves[J].Journal of Engineering Mechanics,2000,126(2):1224-1231.
[16]JT/T663-2006公路桥梁板式橡胶支座规格系列[S].北京:人民交通出版社,2007.JT/T663-2006 Series of Elastomeric Pad bearings for Highway Bridges[S].Beijing:China Communication Press,2007.(In Chinese)
[17]Tavares D H,Padgett J E,Paultre P.Fragility curves of typical as-built highway bridges in eastern Canada[J].Engineering Structures,2012,40(16):107-118.
[18]Specifications for Highway Bridges:Part V.Seismic Design[S].Tokyo:Japan Road Association,2002.
[19]JIG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02-01-2008 Guidelines of Seismic Design of Highway Bridges[S].Beijing:China Communication Press,2008.(In Chinese)
[20]Nielson B G.Analytical fragility curves for highway bridges in moderate seismic zones[D].Atlanta,GA:Georgia Institute of Technology,2005.
[21]Cornell C A,Jalayer F,Hamburger R O,et al.Probabilistic basis for 2000 SAC federal emergency management agency steel moment frame guidelines[J].Journal of Structural Engineering-ASCE,2002,128(4):526-533.
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