斜拉桥合理墩形及墩梁约束体系抗震研究
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摘要
过渡墩、辅助墩墩顶设置平衡重是斜拉桥一种常见设计方式,此设计的特点是墩顶所受质量大、但重力小,由此导致过渡墩、辅助墩在地震作用下受到的地震力大、而轴压力小,进而引发过渡墩、辅助墩的动轴拉力、支座动反拉力以及支座剪力过大等抗震问题。以某斜拉桥为背景,针对其过渡墩、辅助墩墩高小的特点,以及纵向+竖向地震作用下,竖向地震作用使辅助墩墩顶支座以及墩底截面产生较大动反拉力和动轴拉力的现象,提出过渡墩以墙式墩取代门式框架墩、辅助墩墩顶支座改为双向滑动支座、过渡墩墩梁之间横向设置速度型动力锁定装置的比选方案。分析表明,此比选方案可有效解决墩中的动轴拉力、支座动反拉力以及支座剪力过大的问题。但是,由于锁定力需求较大,速度型动力锁定装置的选取需根据进一步的经济比选决定。
Setting the balanced weights on the top of the transition piers and the auxiliary piers is a common design in cable-stayed bridge and its characteristics are the large mass and the light gravity at the top of the piers. The design can lead to the large horizontal earthquake force and the low axial pressure of the transition piers and auxiliary piers under earthquake,and can cause more further seismic problems,such as dynamic axial tension of the transition piers and the auxiliary piers,dynamic vertical tension of bearings and too large horizontal shear of bearings.Taken a cable-stayed bridge as the engineering background,according to the transition piers and auxiliary piers are short and the large dynamic reaction tension of bearings and the large dynamic axial tension at the bottom section of the auxiliary piers when the bridge is subject to the longitudinal and vertical ground motion,the renewal designs are proposed that changing the frame pier to the wall-type pier,changing the bearings at the top of the auxiliary piers to the bidirectional sliding bearings and setting lateral LUDs between the transition piers and the main girder. The seismic responses exhibit that renewal design can solve the former problems effectively. But because of the excessive demand of locking force of LUD,the selection of LUD or not should base on its economic efficiency.
Setting the balanced weights on the top of the transition piers and the auxiliary piers is a common design in cable-stayed bridge and its characteristics are the large mass and the light gravity at the top of the piers. The design can lead to the large horizontal earthquake force and the low axial pressure of the transition piers and auxiliary piers under earthquake,and can cause more further seismic problems,such as dynamic axial tension of the transition piers and the auxiliary piers,dynamic vertical tension of bearings and too large horizontal shear of bearings.Taken a cable-stayed bridge as the engineering background,according to the transition piers and auxiliary piers are short and the large dynamic reaction tension of bearings and the large dynamic axial tension at the bottom section of the auxiliary piers when the bridge is subject to the longitudinal and vertical ground motion,the renewal designs are proposed that changing the frame pier to the wall-type pier,changing the bearings at the top of the auxiliary piers to the bidirectional sliding bearings and setting lateral LUDs between the transition piers and the main girder. The seismic responses exhibit that renewal design can solve the former problems effectively. But because of the excessive demand of locking force of LUD,the selection of LUD or not should base on its economic efficiency.
引文
1 范立础.大跨度桥梁抗震设计.北京:人民交通出版社,2001Fan Lichu.Earthquake resistant design of long-span bridges.Beijing:China Conmunication Press,2011
2 叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究.桥梁建设,2002;(4):1—4Ye Aijun,Hu Shide,Fan Lichu.Research on aseismatic tructural system of cable-stayed bridge.Bridge Construction,2002;(4):1—4
3 彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究.同济大学学报(自然科学版),2009;37(8):1003—1009Peng Wei,Peng Tianbo,Li Jianzhong.Research on longitudinal constraint systems for multi-span cable-stayed bridge.Journal of Tongji University:Natural Science,2009;37(8):1003—1009
4 艾闯.斜拉桥结构体系的抗震性能分析及优化.西安:西安建筑科技大学硕士学位论文,2011Ai Chuang.Seismic performance analysis and optimization of the structural system of the cable-stayed bridge.Xi’an:Master's Degree Thesis of Xi'an University of Architecture and Technology,2011
5 叶爱君,胡世德,范立础.超大跨度斜拉桥的地震位移控制.土木工程学报,2004;37(12):38—43Ye Aijun,Hu Shide,Fan Lichu.Seismic displacement control for super-long-span cable-stayed bridge.China Civil Engineering Journal,2004;37(12):38—43
6 王志强,胡世德,范立础.东海大桥黏滞阻尼器参数研究.中国公路学报,2005;18(3):37—42Wang Zhiqiang,Hu Shide,Fan Lichu.Research on viscous damper parameters od Donghai Bridge.China Journal of Highway and Transport,2005;18(3):37—42
7 杨喜文,张文华,李建中.大跨度斜拉桥横桥向减震研究.地震工程与工程振动,2012;32(1):86—92Yang Xiwen,Zhang Wenhua,Li Jianzhong.Seismic design for longspan cable-stayed bridges in transverse direction.Journal of Earthquake Engineering And Engineering Vibration,2012;32(1):86—92
8 叶爱君,范立础.超大跨度斜拉桥的横向约束体系.中国公路学报,2007;(2):63—67Ye Ai jun,Fan Lichu.Lateral constraint systems for super-long-span cable-stayed bridge.China Journal of Highway and Transport,2007;(2):63—67
9 刘伟庆,徐秀丽,吴晓兰,等.大跨度斜拉桥结构横向消能减震设计方法.振动工程学报,2006(3):426—432Liu Weiqing,Xu Xiuli,Wu Xiaolan et al.Design method of energydissipated earthquake-reduction a long yransverse of long-span cablestayed bridges.Journal of Vibration Engineering,2006;(3):426 —432
10 刘伟岸,叶爱君,王斌斌.大跨度桥梁桩基抗震简化模式的分析与探讨.结构工程师,2007;23(1):51—55Liu Weian,Ye Aijun Wang Binbin.Discussion on seismic simplified modes of pile foundation in long-span bridges.Structural Engineers,2007;23(1):51—55
11 王志强,葛继平.粘滞阻尼器和Lock-up装置在连续梁桥抗震中应用.石家庄铁道学院学报,2006;19(1):5—9Wang Zhiqiang,Ge Jiping.Application of viscous damper and lockup devices in the seismic design of continuous girder bridges.Journal of Shijiazhuang Railway Institute,2006;19(1):5—9
2 叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究.桥梁建设,2002;(4):1—4Ye Aijun,Hu Shide,Fan Lichu.Research on aseismatic tructural system of cable-stayed bridge.Bridge Construction,2002;(4):1—4
3 彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究.同济大学学报(自然科学版),2009;37(8):1003—1009Peng Wei,Peng Tianbo,Li Jianzhong.Research on longitudinal constraint systems for multi-span cable-stayed bridge.Journal of Tongji University:Natural Science,2009;37(8):1003—1009
4 艾闯.斜拉桥结构体系的抗震性能分析及优化.西安:西安建筑科技大学硕士学位论文,2011Ai Chuang.Seismic performance analysis and optimization of the structural system of the cable-stayed bridge.Xi’an:Master's Degree Thesis of Xi'an University of Architecture and Technology,2011
5 叶爱君,胡世德,范立础.超大跨度斜拉桥的地震位移控制.土木工程学报,2004;37(12):38—43Ye Aijun,Hu Shide,Fan Lichu.Seismic displacement control for super-long-span cable-stayed bridge.China Civil Engineering Journal,2004;37(12):38—43
6 王志强,胡世德,范立础.东海大桥黏滞阻尼器参数研究.中国公路学报,2005;18(3):37—42Wang Zhiqiang,Hu Shide,Fan Lichu.Research on viscous damper parameters od Donghai Bridge.China Journal of Highway and Transport,2005;18(3):37—42
7 杨喜文,张文华,李建中.大跨度斜拉桥横桥向减震研究.地震工程与工程振动,2012;32(1):86—92Yang Xiwen,Zhang Wenhua,Li Jianzhong.Seismic design for longspan cable-stayed bridges in transverse direction.Journal of Earthquake Engineering And Engineering Vibration,2012;32(1):86—92
8 叶爱君,范立础.超大跨度斜拉桥的横向约束体系.中国公路学报,2007;(2):63—67Ye Ai jun,Fan Lichu.Lateral constraint systems for super-long-span cable-stayed bridge.China Journal of Highway and Transport,2007;(2):63—67
9 刘伟庆,徐秀丽,吴晓兰,等.大跨度斜拉桥结构横向消能减震设计方法.振动工程学报,2006(3):426—432Liu Weiqing,Xu Xiuli,Wu Xiaolan et al.Design method of energydissipated earthquake-reduction a long yransverse of long-span cablestayed bridges.Journal of Vibration Engineering,2006;(3):426 —432
10 刘伟岸,叶爱君,王斌斌.大跨度桥梁桩基抗震简化模式的分析与探讨.结构工程师,2007;23(1):51—55Liu Weian,Ye Aijun Wang Binbin.Discussion on seismic simplified modes of pile foundation in long-span bridges.Structural Engineers,2007;23(1):51—55
11 王志强,葛继平.粘滞阻尼器和Lock-up装置在连续梁桥抗震中应用.石家庄铁道学院学报,2006;19(1):5—9Wang Zhiqiang,Ge Jiping.Application of viscous damper and lockup devices in the seismic design of continuous girder bridges.Journal of Shijiazhuang Railway Institute,2006;19(1):5—9
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