主塔塔形对独塔斜拉桥主塔横向地震反应影响
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摘要
随着中国基础建设的发展,大跨度斜拉桥越来越在震后救灾生命线中扮演着枢纽的角色。但目前国内外对于斜拉桥抗震性能的研究多集中于纵向飘浮体系的合理约束装置及其参数的选取上。对于斜拉桥横桥向地震反应的研究则鲜有涉及,讨论桥塔造型对于横向地震动影响的更是几乎没有。以实际桥梁为背景,从斜拉桥整体构造的角度,利用非线性时程方法分析了倒Y型、A型、H型及宝石型4种常见斜拉桥主塔塔形对横向地震反应的影响。结果显示,H型桥塔横向抗震性能最优,宝石型桥塔最不利,其余两种桥塔构型介于这两者之间。并且注意到,对于某些构型的桥塔,进行抗震设计时同时需要注意恒载的影响。
With fast development of Chinese infrastructure construction,long- span cable stayed bridge is playing a more important role as hub of relief lifeline after earthquake. However,existing researches for seismic response of cable- stayed bridge focus mainly on choosing appropriate restraint devices of longitudinal floating system,and reasonable parameters of them. Among few studies on transverse response of cable- stayed bridge,almost none of them discussed anything about the influence of tower type. Present study,which focused on transverse seismic response,utilized nonlinear time history method to analyze four bridges with common tower types,namely inverted Y type,A type,H type and gem type. The results show that bridge with H type tower performs best in transverse seismic excitation,followed with inverted Y type and A type,while the gem type one ranking the last. It is noted that seismic design should also take dead load into consideration when relating to some certain types of tower.
With fast development of Chinese infrastructure construction,long- span cable stayed bridge is playing a more important role as hub of relief lifeline after earthquake. However,existing researches for seismic response of cable- stayed bridge focus mainly on choosing appropriate restraint devices of longitudinal floating system,and reasonable parameters of them. Among few studies on transverse response of cable- stayed bridge,almost none of them discussed anything about the influence of tower type. Present study,which focused on transverse seismic response,utilized nonlinear time history method to analyze four bridges with common tower types,namely inverted Y type,A type,H type and gem type. The results show that bridge with H type tower performs best in transverse seismic excitation,followed with inverted Y type and A type,while the gem type one ranking the last. It is noted that seismic design should also take dead load into consideration when relating to some certain types of tower.
引文
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[8]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报(自然科学版),2012,40(6):132-138.XU Yan,DUAN Xinzhi,LI Jianzhong.Analysis of Nonlinear Seismic Response of Cable-Stayed Bridge Subjected to Longitudinal Strong Ground Motions[J].Journal of South China University of Technology(Natural Science Edition),2012,40(6):132-138.
[9]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(自然科学版),2001,1:003.YANG Yumin,YUAN Wancheng,FAN Li-chu.Transverse Seismic Response of Long—span Cable-stayed Bridges and Thei r Fracta I Characteristic[J].Journal of Tongji University(Natural Science),2001,1:003.
[10]叶爱君.桥梁抗震[M].北京:人民交通出版社,2008:1-143.YE Aijun.Seismic Design of Bridges[M].Beijing:People’s Traffic Press,2008:1-143.
[2]辛兵,王克海,徐升桥.京新高速上地斜拉桥抗震设计分析[J].铁道勘察,2012,38(6):79-84.XIN Bing,WANG Kehai,XU Shengqiao.A seismic Design Analysis of Cable-stayed Bridge in Beijing-Xinjiang Highway[J].Investigation and Surveying,2012,38(6):79-84.
[3]LIANG D,SHEN H C,LI Y F.Influence of Cable Dampers on Cable-Stayed Bridges[J].Applied Mechanics and Materials,2013,256:1474-1479.
[4]ZHANG Y,YANG J X.Analysis of Seismic Response of the Single Tower Cable-Stayed Bridge with Seismicity Mitigation and Energy Dissipation Devices[J].Applied Mechanics and Materials,2012,166:2092-2099.
[5]QIU W L,JIANG M,ZHANG X B.Seismic Response Analysis of Cable-Stayed Bridges[J].Advanced Materials Research,2012,446:2290-2294.
[6]QIU W L,JIANG M,ZHANG X B.Seismic Response Reduction of Cable-Stayed Bridge with Viscous Dampers[J].Applied Mechanics and Materials,2012,137:154-158.
[7]QIAO XS,JI WG,ZHAONG TY,Hu B.Influence of Cable Arragement Types on the Seismic Performance of Cable-stayed Bridge[J].New Technologies of Railway Engineering,2012,765-771.
[8]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报(自然科学版),2012,40(6):132-138.XU Yan,DUAN Xinzhi,LI Jianzhong.Analysis of Nonlinear Seismic Response of Cable-Stayed Bridge Subjected to Longitudinal Strong Ground Motions[J].Journal of South China University of Technology(Natural Science Edition),2012,40(6):132-138.
[9]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(自然科学版),2001,1:003.YANG Yumin,YUAN Wancheng,FAN Li-chu.Transverse Seismic Response of Long—span Cable-stayed Bridges and Thei r Fracta I Characteristic[J].Journal of Tongji University(Natural Science),2001,1:003.
[10]叶爱君.桥梁抗震[M].北京:人民交通出版社,2008:1-143.YE Aijun.Seismic Design of Bridges[M].Beijing:People’s Traffic Press,2008:1-143.
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