荷麻溪大桥动力特性与地震反应谱分析
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摘要
研究目的:为检验双塔单索面部分斜拉桥的抗震性能,建立荷麻溪大桥的动力特性分析力学模型,运用有限元法进行动力特性与地震反应谱分析。采用标准反应谱作为输入的谱曲线,分别考虑纵向、横向和竖向输入下该桥的地震响应,研究地震作用下结构的内力和变形,分析该桥的抗震性能。研究结论:结构动力特性分析表明:荷麻溪大桥的1阶主振型为对称竖弯,因此大桥受竖向地震响应很大;桥的2阶振型为纵移,在纵向地震作用下,桥墩和主梁连接处将产生较大的弯矩和剪力。地震反应谱分析结果表明,主桥结构关键部位基本保持弹性,满足抗震设计要求。
Research purposes: A three-dimensional finite element model was developed in order to verify the seismic performances of the Hemaxi Cable-stayed Bridge with double towel and single cable plane.The dynamic characteristics and seismic response spectrum of Hemaxi Bridge were analyzed.By using the standard seismic response spectrum as the input spectrum curve and on consideration to the seismic response of the bridge under the effects of the longitudinal,transverse and vertical responses inputs respectively,the research was done on the internal force and deformation of the bridge structure under the seismic effect and the seismic performance of the bridge was analyzed.Research conclusions:The analysis of the dynamic characteristics indicated that the first order vibration mode of the Hemaxi Bridge was of vertically symmetrical bend,so the bridge had much response to the vertical earthquake.The second vibration mode was of move in longitudinal direction,so larger bend and shear forces could appear in the joint of the bridge pier and main girder under longitudinal earthquake.The response spectrum results showed that the important components of bridge still remained the elasticity that could satisfy the requirements of seismic design.
Research purposes: A three-dimensional finite element model was developed in order to verify the seismic performances of the Hemaxi Cable-stayed Bridge with double towel and single cable plane.The dynamic characteristics and seismic response spectrum of Hemaxi Bridge were analyzed.By using the standard seismic response spectrum as the input spectrum curve and on consideration to the seismic response of the bridge under the effects of the longitudinal,transverse and vertical responses inputs respectively,the research was done on the internal force and deformation of the bridge structure under the seismic effect and the seismic performance of the bridge was analyzed.Research conclusions:The analysis of the dynamic characteristics indicated that the first order vibration mode of the Hemaxi Bridge was of vertically symmetrical bend,so the bridge had much response to the vertical earthquake.The second vibration mode was of move in longitudinal direction,so larger bend and shear forces could appear in the joint of the bridge pier and main girder under longitudinal earthquake.The response spectrum results showed that the important components of bridge still remained the elasticity that could satisfy the requirements of seismic design.
引文
[1]范立础.桥梁抗震[M].上海:同济大学出版社,1997.Fan Lichu,Anti-seismic Performance of Bridge[M].Shanghai:Tongji University Press,1997.
[2]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1996.Li Guohao.Stability and Vibration of Bridge Structure[M].Beijing:Chinese Railway Publishing House,1996.
[3]朱宏平,唐家祥.斜拉桥动力分析的三维有限元模型[J].振动工程学报,1998(1):121-126.Zhu Hongping,Tang Jiaxiang.A Three DimensionalFinite Element Model of Cable-stayed Bridges forDynamic Analysis[J].Journal of VibrationEngineering,1998(1):121-126.
[4]苏成,韩大建,王乐文.大跨度斜拉桥结构三维有限元动力模型的建立[J].华南理工大学学报,1999(11):51-56.Su Cheng,Han Dajian,Wang Lewen,TheEstablishment of 3-D Finite Element Dynamic Modelsfor Lang-span Cable-stayed Bridges[J].Journal ofSouth China University of Technology,1999(11):51-56.
[5]闫冬,袁万城.大跨度斜拉桥的抗震概念设计[J].同济大学学报,2004(10):1344-1348.Yan Dong,Yuan Wancheng.Conceptual SeismicDesign for Lang-span Cable-stayed Bridges[J].Journal of Tongji University,2004(10):1344-1348.
[6]杨玉民,袁万城,范立础.大跨斜拉桥横向地震反应及其分形特征[J].同济大学学报,2001(1):15-19.Yang Yumin,Yuan Wancheng,Fan Lichu.TransverseSeismic Response of Long-span Cable-stayed Bridgesand Their Fractal Characteristic[J].Journal of TongjiUniversity,2001(1):15-19.
[7]叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究[J].桥梁建设,2002(4):1-4.Ye Aijun,Hu Shide,Fan Lichu.Research onAseismatic Structural System of Cable0stayed Bridge[J].Bridge Construction,2002(4):1-4.
[8]竹晓华.连续刚构桥地震反应分析[J].铁道工程学报,2008(10):15-21.Zhu Xiaohua.Seismic Analysis of a Continuous RigidBridge[J].Journal of Railway Engineering Society,2008(10):15-21.
[9]董胜利,亓兴军.大跨斜拉桥减震控制分析[J].铁道工程学报,2007(7):47-51.Dong Shengli,Qi Xingjun,Seismic Response ControlAnalysis of Long-span Cable-stayed Bridge[J].Journal of Railway Engineering Society,2007(7):47-51.
[10]J TJ 004—89,公路工程抗震设计规范[S].J TJ004—89,Specifications of Earthquake ResistantDesign for Highway Engineering[S].
[2]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1996.Li Guohao.Stability and Vibration of Bridge Structure[M].Beijing:Chinese Railway Publishing House,1996.
[3]朱宏平,唐家祥.斜拉桥动力分析的三维有限元模型[J].振动工程学报,1998(1):121-126.Zhu Hongping,Tang Jiaxiang.A Three DimensionalFinite Element Model of Cable-stayed Bridges forDynamic Analysis[J].Journal of VibrationEngineering,1998(1):121-126.
[4]苏成,韩大建,王乐文.大跨度斜拉桥结构三维有限元动力模型的建立[J].华南理工大学学报,1999(11):51-56.Su Cheng,Han Dajian,Wang Lewen,TheEstablishment of 3-D Finite Element Dynamic Modelsfor Lang-span Cable-stayed Bridges[J].Journal ofSouth China University of Technology,1999(11):51-56.
[5]闫冬,袁万城.大跨度斜拉桥的抗震概念设计[J].同济大学学报,2004(10):1344-1348.Yan Dong,Yuan Wancheng.Conceptual SeismicDesign for Lang-span Cable-stayed Bridges[J].Journal of Tongji University,2004(10):1344-1348.
[6]杨玉民,袁万城,范立础.大跨斜拉桥横向地震反应及其分形特征[J].同济大学学报,2001(1):15-19.Yang Yumin,Yuan Wancheng,Fan Lichu.TransverseSeismic Response of Long-span Cable-stayed Bridgesand Their Fractal Characteristic[J].Journal of TongjiUniversity,2001(1):15-19.
[7]叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究[J].桥梁建设,2002(4):1-4.Ye Aijun,Hu Shide,Fan Lichu.Research onAseismatic Structural System of Cable0stayed Bridge[J].Bridge Construction,2002(4):1-4.
[8]竹晓华.连续刚构桥地震反应分析[J].铁道工程学报,2008(10):15-21.Zhu Xiaohua.Seismic Analysis of a Continuous RigidBridge[J].Journal of Railway Engineering Society,2008(10):15-21.
[9]董胜利,亓兴军.大跨斜拉桥减震控制分析[J].铁道工程学报,2007(7):47-51.Dong Shengli,Qi Xingjun,Seismic Response ControlAnalysis of Long-span Cable-stayed Bridge[J].Journal of Railway Engineering Society,2007(7):47-51.
[10]J TJ 004—89,公路工程抗震设计规范[S].J TJ004—89,Specifications of Earthquake ResistantDesign for Highway Engineering[S].
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