地震作用下大跨度悬索桥纵向破坏模式研究
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摘要
地震作用下结构破坏模式研究是合理保证结构震后安全性的基础,而目前对大跨度悬索桥破坏模式的研究还很少。在大跨度悬索桥中,主缆、加劲梁、吊索等构件组成柔性悬吊体系一般采用钢结构,而主塔为核心支撑构件,且目前在我国修建的大跨度悬索桥中,基本都是门式或框架式的钢筋混凝土桥塔。因此,地震破坏模式的研究重点为大跨度悬索桥的钢筋混凝土桥塔。借助大型有限元分析程序,以润扬大跨度悬索桥的设计方案为背景,对地震作用下大跨度悬索桥纵向破坏模式及其特征展开探讨,发现其桥塔地震破坏模式为具有同时性特征的双塑性铰破坏模式,此失效模式表明此时塑性铰依次形成机制不存在,其屈服后的塑性性能是否能如中小桥梁一样被大幅利用以及如何利用,应由桥塔的塑性动力稳定决定。
Research on structural failure patterns forms the basis for structures to survive serious earthquakes.However,study of the failure patterns of long span suspension bridges under earthquake is rarely seen in the literature.For long span suspension bridges in China,the suspension part,consisting of main cables,stiffening girds and hanger ropes,is usually made of steel,and the pylon towers,as the core structural support components,are usually composed of reinforced concrete frames.Therefore,the focus of the study on the failure patterns of long span suspension bridges is on the reinforced concrete pylon towers.The longitudinal failure pattern and corresponding characteristics of long span suspension bridges under earthquake are investigated through finite element analysis with the Runyang long span suspension bridge as the example.The failure pattern is found to be in the form of synchronal double plastic-hinges.This implies that such mechanism in which the plastic hinges generate successively does not exist.Hence,whether or not the stiffness,after yielding of the pylon towers,can be used just like short or middle span reinforced concrete bridge depends on the structure's plastic buckling behavior under earthquake.
Research on structural failure patterns forms the basis for structures to survive serious earthquakes.However,study of the failure patterns of long span suspension bridges under earthquake is rarely seen in the literature.For long span suspension bridges in China,the suspension part,consisting of main cables,stiffening girds and hanger ropes,is usually made of steel,and the pylon towers,as the core structural support components,are usually composed of reinforced concrete frames.Therefore,the focus of the study on the failure patterns of long span suspension bridges is on the reinforced concrete pylon towers.The longitudinal failure pattern and corresponding characteristics of long span suspension bridges under earthquake are investigated through finite element analysis with the Runyang long span suspension bridge as the example.The failure pattern is found to be in the form of synchronal double plastic-hinges.This implies that such mechanism in which the plastic hinges generate successively does not exist.Hence,whether or not the stiffness,after yielding of the pylon towers,can be used just like short or middle span reinforced concrete bridge depends on the structure's plastic buckling behavior under earthquake.
引文
[1]Seismic design criteria[S].Version 1.3.Sacramento,California:California Department of Transportation(CALTRANS),2004
[2]JTG/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—2008Guidelines for seismic design of highway bridges[S].Beijing:China Communication Press,2008(in Chinese))
[3]Nazmy A S,Abdel-Ghaffar A M.Non-linear earthquake-response analysis of long-span cable-stayed bridges:theory[J].Earthquake Engineering and Structural Dynamics,1990,19(1):45-62
[4]Nazmy A S,Abdel-Ghaffar A M.Non-linear earthquake-response analysis of long-span cable-stayed bridges:applications[J].Earthquake Engineering and StructuralDynamics,1990,19(1):63-76
[5]肖汝诚,项海帆.大跨径悬索桥结构分析理论及其专用程序系统的研究[J].中国公路学报,1998,11(4):42-50(Xiao Rucheng,Xiang Haifan.Research on thestructural analysis theory and special program of long-spansuspension bridge[J].China Journal of Highway andTransport,1998,11(4):42-50(in Chinese))
[6]秦权,楼磊.非经典阻尼对悬索桥地震反应的影响[J].土木工程学报,1999,32(3):17-22(Qin Quan,Lou Lei.Effect of non-proportional damping on seismic responses ofsuspension bridges[J].China Civil Engineering Journal,1999,32(3):17-22(in Chinese))
[7]Ingham T J,Rodriguez S,Nader M.Nonlinear analysis ofthe Vincent Thomas Bridge for seismic retrofit[J].Computers&Structures,1997,64(5/6):1221-1238
[8]王浩,李爱群,郭彤.超大跨悬索桥地震响应的综合最优控制研究[J].湖南大学学报:自然科学版,2006,33(3):6-10(Wang Hao,Li Aiqun,Guo Tong.Compositiveoptimal control of the seismic response for super-long-spansuspension bridges[J].Journal of Hunan University:Natural Sciences Edition,2006,33(3):6-10(inChinese))
[9]Nazmy A S,Abdel-Ghaffar A M.Effects of ground motionspatial variability on the response of cable-stayed bridges[J].Earthquake Engineering and Structural Dynamics,1992,21(1):1-20
[10]张亚辉,李丽媛,陈艳,等.大跨度结构地震行波效应研究[J].大连理工大学学报,2005,45(4):480-486(Zhang Yahui,Li Liyuan,Chen Yan,et al.Wave passageeffect on random seismic response of long-span structures[J].Journal of Dalian University of Technology,2005,45(4):480-486(in Chinese))
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001
[2]JTG/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—2008Guidelines for seismic design of highway bridges[S].Beijing:China Communication Press,2008(in Chinese))
[3]Nazmy A S,Abdel-Ghaffar A M.Non-linear earthquake-response analysis of long-span cable-stayed bridges:theory[J].Earthquake Engineering and Structural Dynamics,1990,19(1):45-62
[4]Nazmy A S,Abdel-Ghaffar A M.Non-linear earthquake-response analysis of long-span cable-stayed bridges:applications[J].Earthquake Engineering and StructuralDynamics,1990,19(1):63-76
[5]肖汝诚,项海帆.大跨径悬索桥结构分析理论及其专用程序系统的研究[J].中国公路学报,1998,11(4):42-50(Xiao Rucheng,Xiang Haifan.Research on thestructural analysis theory and special program of long-spansuspension bridge[J].China Journal of Highway andTransport,1998,11(4):42-50(in Chinese))
[6]秦权,楼磊.非经典阻尼对悬索桥地震反应的影响[J].土木工程学报,1999,32(3):17-22(Qin Quan,Lou Lei.Effect of non-proportional damping on seismic responses ofsuspension bridges[J].China Civil Engineering Journal,1999,32(3):17-22(in Chinese))
[7]Ingham T J,Rodriguez S,Nader M.Nonlinear analysis ofthe Vincent Thomas Bridge for seismic retrofit[J].Computers&Structures,1997,64(5/6):1221-1238
[8]王浩,李爱群,郭彤.超大跨悬索桥地震响应的综合最优控制研究[J].湖南大学学报:自然科学版,2006,33(3):6-10(Wang Hao,Li Aiqun,Guo Tong.Compositiveoptimal control of the seismic response for super-long-spansuspension bridges[J].Journal of Hunan University:Natural Sciences Edition,2006,33(3):6-10(inChinese))
[9]Nazmy A S,Abdel-Ghaffar A M.Effects of ground motionspatial variability on the response of cable-stayed bridges[J].Earthquake Engineering and Structural Dynamics,1992,21(1):1-20
[10]张亚辉,李丽媛,陈艳,等.大跨度结构地震行波效应研究[J].大连理工大学学报,2005,45(4):480-486(Zhang Yahui,Li Liyuan,Chen Yan,et al.Wave passageeffect on random seismic response of long-span structures[J].Journal of Dalian University of Technology,2005,45(4):480-486(in Chinese))
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001
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