不同支座约束方式下的斜拉桥抗震性能分析
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摘要
为确定某一独塔双索面斜拉桥合理的抗震约束体系,运用有限元软件Sap,结合该桥的特点,建立了索塔纵向、过渡墩纵横向均自由和索塔纵横向、过渡墩横向均约束两种不同约束的体系下桥梁的有限元模型,这两种约束体系分别视为方案1和方案2,并对其分别进行自振特性以及的地震响应分析。结果表明,方案2和方案1相比,主塔支座处的剪力、塔柱的内力以及过渡墩和主塔支座处的位移都降低了很多,索塔约束可降低主塔的内力,从而提高主塔的安全度,因此推荐采用索塔纵横向、过渡墩横向均约束的方案。
In order to find out the appropriate seismic constraint system for single pylons and double cable planes cable-stayed bridge,the space finite element model of the bridge with different constraint system was established by using the software Sap program:tower is free in longitudinal direction and transition piers is free in longitudinal and lateral directions;tower is constrained in longitudinal and lateral directions and transition piers is constrained in lateral direction.The two kinds of constraint system are regarded as Scheme 1 and Scheme 2.The analysis of the structural natural vibration characteristic and response under earthquake wave were carried out.The results of calculation indicate that,comparing with Scheme 1,the shear at the tower bearing,the force of tower,the displacement at transition piers and tower bearing of scheme 2 are all reduced,and the safety of tower of scheme 2 is enhanced.So Scheme 2 is adopted in the paper.
In order to find out the appropriate seismic constraint system for single pylons and double cable planes cable-stayed bridge,the space finite element model of the bridge with different constraint system was established by using the software Sap program:tower is free in longitudinal direction and transition piers is free in longitudinal and lateral directions;tower is constrained in longitudinal and lateral directions and transition piers is constrained in lateral direction.The two kinds of constraint system are regarded as Scheme 1 and Scheme 2.The analysis of the structural natural vibration characteristic and response under earthquake wave were carried out.The results of calculation indicate that,comparing with Scheme 1,the shear at the tower bearing,the force of tower,the displacement at transition piers and tower bearing of scheme 2 are all reduced,and the safety of tower of scheme 2 is enhanced.So Scheme 2 is adopted in the paper.
引文
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[9]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 design of prestressed concrete multispan cable-stayed bridge[J].Journal of ForeignHighway,1999,19(5):34.
[10]JTG/T B02-01-2008公路桥梁抗震设计细则[S].重庆:重庆交通科研设计院,2008.JTG/T B02-01-2008.Highway bridge aseismic design regulation[S].Chongqing:Chongqing Communications Research and Design Inititute,2008.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Bridge Seismic[M].ShangHai:Tongji University Press,1997.
[3]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 seismic response analysis of cable-stayed bridge systems with energy dissipation[J].Chi-na Journal of Highway and Transport,1998,11(1):71.
[4]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 structural system of cable-stayed bridge[J].Bridge Construction,2002(4):1.
[5]项海帆,李瑞森,杨昌众.悬浮体系斜张桥的近似抗震计算[J].结构工程师,1986(1):64-69.XIANG Haifan,LI Ruisen,YANG Changzong.Calculate on approximate seismic of suspending system bridge[J].Structural Engineers,1986(1):64-69.
[6]黄小国,李建中,郭磊.地震作用下独塔斜拉桥合理约束体系[J].结构工程师,2008(12):29-35.HUANG Xiaoguo,LI Jianzhong,GUO Lei.Appropriate Constraint Systems for Simple-Tower Cable-Stayed Bridges under Earthquake[J].Structural Engineers,2008(12):29-35.
[7]彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究[J].同济大学学报(自然科学版),2009,37(8):1003-1008.PENG Wei,PENG Tianbo,LI Jianzhong.Research on longitudinal constraint systems for multispan cable-stayed Bridges[J].Journd of Tongji Lni-versity Natuand scieice Edition,2009,37(8):1003-1009.
[8]周云,周福霖,李新平.桥梁震害与减震防灾新对策[J].世界地震工程,1997,13(1):32-33.ZHOU Yun,ZHOU Fulin,LI Xinping.Earthquake Hazard of Bridges and the newcountermeasures on its reduction[J].World Earthquake Engi-neering,1997,13(1):32-33.
[9]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 design of prestressed concrete multispan cable-stayed bridge[J].Journal of ForeignHighway,1999,19(5):34.
[10]JTG/T B02-01-2008公路桥梁抗震设计细则[S].重庆:重庆交通科研设计院,2008.JTG/T B02-01-2008.Highway bridge aseismic design regulation[S].Chongqing:Chongqing Communications Research and Design Inititute,2008.
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