多塔斜拉桥纵向约束体系研究
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摘要
为确定多塔斜拉桥纵向合理的抗震约束体系,以我国某六塔斜拉桥为研究对象,分析研究了塔梁纵向四种不同固结约束下的结构动力特性和线性地震反应.计算结果表明,对于多塔斜拉桥,仅从调整塔梁纵向固结约束位置的角度出发,部分塔梁固结体系不是理想的抗震体系;塔梁纵向全固结体系和全漂浮体系都有助于减小结构地震反应在各塔的分配差异,但将纵向全漂浮的多塔斜拉桥应用于软土地基时,需关注边塔的抗震设计和结构的纵向位移.
In order to find out the appropriate longitudinal seismic constraint system for multispan cable-stayed bridge,an analysis is made of the dynamic characteristics and linear seismic response of the bridge under four kinds of rigid constraint systems between girder and different pylons in longitudinal direction based on a cable-stayed bridge with six pylons in China.The results indicate that,for a multispan cable-stayed bridge,only changing the positions of rigid constraints,the partial pylons constraint system is not appropriate for seismic performance;the system with all the pylons being constrained by girder or the total floating system can diminish the difference of seismic response of different pylons,but when multispan cable-stayed bridges with total floating system are used in soft soil condition,special attention must be paid to the seismic design of side pylon and structural longitudinal displacement.
In order to find out the appropriate longitudinal seismic constraint system for multispan cable-stayed bridge,an analysis is made of the dynamic characteristics and linear seismic response of the bridge under four kinds of rigid constraint systems between girder and different pylons in longitudinal direction based on a cable-stayed bridge with six pylons in China.The results indicate that,for a multispan cable-stayed bridge,only changing the positions of rigid constraints,the partial pylons constraint system is not appropriate for seismic performance;the system with all the pylons being constrained by girder or the total floating system can diminish the difference of seismic response of different pylons,but when multispan cable-stayed bridges with total floating system are used in soft soil condition,special attention must be paid to the seismic design of side pylon and structural longitudinal displacement.
引文
[1]胡建华,廖建宏,向建军.预应力混凝土多塔斜拉桥设计构思[J].国外公路,1999,19(5):34.HU Jianhua,LIAO Jianhong,XIANG Jianjun.Planning and designof prestressed concrete multispan cable-stayed bridge[J].Journal of Foreign Highway,1999,19(5):34.
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[3]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.YE Aijun,HU Shide,FAN Lichu.Research on aseismatic structuralsystem of cable-stayed bridge[J].Bridge Construction,2002(4):1.
[4]Virlogeux M.Bridges with multiple cable-stayed spans[J].Structural Engineering International,2001(1):61.
[5]Papanikolas.The Rion-antirion multispan cable-stayed bridge[C]∥Proceedings Second MIT Conference on Computational Fluidand Solid Mechanics.[S.l.]:Elsevier Science Ltd,2003:548-552.
[6]郑春,刘晓东.论多塔斜拉桥的刚度[J].公路,2002,6(6):98.ZHENG Chun,LIU Xiaodong.Rigidity of multi-tower cable-stayed bridge[J].Highway,2002,6(6):98.
[7]喻梅,李乔.结构布置对多塔斜拉桥力学行为的影响[J].桥梁建设,2004(2):1.YU Mei,LI Qiao.Effect of structural arrangement on mechanicalbehavior of multispan cable-stayed bridges[J].BridgeConstruction,2004(2):1.
[8]UCBerkeley:Pacific Earthquake Engineering Research Center:NGA Database[DB/OL].[2008-11-27].http://peer.berkeley.edu/nga/
[2]李建中,袁万城.斜拉桥减震、耗能体系非线性纵向地震反应分析[J].中国公路学报,1998,11(1):71.LI Jianzhong,YUAN Wancheng.Nonlinear longitudinal seismicresponse analysis of cable-stayed bridge systems with energydissipation[J].China Journal of Highway and Transport,1998,11(1):71.
[3]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.YE Aijun,HU Shide,FAN Lichu.Research on aseismatic structuralsystem of cable-stayed bridge[J].Bridge Construction,2002(4):1.
[4]Virlogeux M.Bridges with multiple cable-stayed spans[J].Structural Engineering International,2001(1):61.
[5]Papanikolas.The Rion-antirion multispan cable-stayed bridge[C]∥Proceedings Second MIT Conference on Computational Fluidand Solid Mechanics.[S.l.]:Elsevier Science Ltd,2003:548-552.
[6]郑春,刘晓东.论多塔斜拉桥的刚度[J].公路,2002,6(6):98.ZHENG Chun,LIU Xiaodong.Rigidity of multi-tower cable-stayed bridge[J].Highway,2002,6(6):98.
[7]喻梅,李乔.结构布置对多塔斜拉桥力学行为的影响[J].桥梁建设,2004(2):1.YU Mei,LI Qiao.Effect of structural arrangement on mechanicalbehavior of multispan cable-stayed bridges[J].BridgeConstruction,2004(2):1.
[8]UCBerkeley:Pacific Earthquake Engineering Research Center:NGA Database[DB/OL].[2008-11-27].http://peer.berkeley.edu/nga/
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