连续梁桥隔震方案比较
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摘要
连续梁桥一般采用减隔震支座组成隔震支座体系进行抗震设计,不同的支座布置方式决定着结构的抗震性能与工程造价两个工程建设中主要关注的因素。在简要介绍铅芯橡胶支座的基础上,针对所有支座均设置铅芯橡胶支座以及组合使用铅芯橡胶支座与滑板支座的隔震方案,脉冲与非脉冲的两组不同地震动下,采用两种不同墩高,对墩高一致的三跨连续梁桥建立三维有限元模型进行地震响应计算,并对抗震性能与经济性进行了分析研究。结果表明,采用普通的滑板支座与铅芯橡胶联合使用同样能够获得较好的抗震性能,能有效地减少工程造价,节约成本;并且隔震支座的布置位置、墩高以及地震动输入的脉冲特性对隔震性能与经济性影响较大,对于墩高不大以及墩高基本一致的连续梁桥,当边墩设置隔震支座而中墩采用普通支座的情况下能获得良好的抗震性能与经济效益。
The use of isolation bearing in supporting system is the main seismic isolation measures used in multi-span continuous girder bridges.It will lead to different seismic performance and economical efficiency for bridges when the bearing arrangement is different.This paper makes an introduction to the lead rubber bearing,and an analytical study on the performance and economical efficiency of seismically isolated bridge structures under the condition that all or part of bearings are lead rubber bearings subjected to earthquake excitation,with pulse and non-pulse,is conducted.The change of pier height is taken into consideration.The study shows that the scheme,in which part of bearing is lead rubber bearing,performs as well as all bearing is lead rubber bearing,and furthermore it has high economical efficiency;The location of seismic bearing,height of pier and pulse characteristic are decisive for seismic and economic performance.When the bearing is located on the side pier of bridge with low and about the same height of piers will have high performance.
The use of isolation bearing in supporting system is the main seismic isolation measures used in multi-span continuous girder bridges.It will lead to different seismic performance and economical efficiency for bridges when the bearing arrangement is different.This paper makes an introduction to the lead rubber bearing,and an analytical study on the performance and economical efficiency of seismically isolated bridge structures under the condition that all or part of bearings are lead rubber bearings subjected to earthquake excitation,with pulse and non-pulse,is conducted.The change of pier height is taken into consideration.The study shows that the scheme,in which part of bearing is lead rubber bearing,performs as well as all bearing is lead rubber bearing,and furthermore it has high economical efficiency;The location of seismic bearing,height of pier and pulse characteristic are decisive for seismic and economic performance.When the bearing is located on the side pier of bridge with low and about the same height of piers will have high performance.
引文
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[7]Mori A,Moss P J,Cook N,Carr A.J.,The Behavior of Bearings Used for Seismic Isolation under Shear and Axial Load[J].Earthquake Spectra,1999,15(2):199-224.
[8]JT/T822-2011公路桥梁铅芯隔震橡胶支座[S].北京:人民交通出版社,2012.JT/T 822-2011Lead Rubber Bearing Isolator for Highway Bridge[S].Beijing:China Communications Press,2012.(in Chinese)
[9]叶爱君.桥梁抗震[M].北京:人民交通出版社,2011.YE Aijun.Seismic design for highway bridges[M].Beijing:China Communications Press,2011(in Chinese)
[10]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Lichu,WANG Zhiqiang.Bridge seismic isolation[M].Beijing:China Communication Press,2001.(in Chinese)
[2]郑通彦,李洋,候建盛,等.2008年中国大陆地震灾害损失述评[J].自然灾害学报,2010,25(2):112-117.ZHENG Tongyan,LI Yang,HOU Jiansheng,et al.Loss assessments of earthquake disasters in mainland China in 2008[J].Journal of Natural Disas-ter,2010,25(2):112-117.(in Chinese)
[3]普瑞斯特雷M.J.N,塞勃勒F,卡尔维G.M.桥梁抗震设计与加固[M].袁万城,胡勃,崔飞,等译.北京:人民交通出版社,1997.Preistley M J N,Seible F,Calvi G M.Seismic Design and Retrofit of Bridge[M].Trans.Yuan Wancheng,Hu Bo,Cui Fei,et al.Beijing:ChinaCommunication Press,1997.
[4]曹新建.大型桥梁的抗震能力设计策略[D].上海:同济大学,2009.CAO Xinjian.Design strategy on aseismic capacity of large bridge[D],Shanghai:Tongji University,2009.(in Chinese)
[5]Wei Zhenghua,Yuan Wancheng,Cheung Pak-chiu,et al.Seismic performance of continuous girder bridges using Cable-sliding friction aseismicbearing[C]//The Proceedings of the Twelfth East Asia-Pacific Conference on Structural Engineering and Construction—EASEC12,2011:Pages914-921.
[6]彭天波,李建中,范立础.双曲面球型减隔震支座的开发及应用[J].同济大学学报:自然科学版,2007,35(2):176-181.PENG Tianbo,LI Jian zhong,FAN Lichu.Development and appli-cationof double sphericala.seismci bearing[J].Journal of Tongji University:Natural Science,2007,35(2):176-181.(in Chinese)
[7]Mori A,Moss P J,Cook N,Carr A.J.,The Behavior of Bearings Used for Seismic Isolation under Shear and Axial Load[J].Earthquake Spectra,1999,15(2):199-224.
[8]JT/T822-2011公路桥梁铅芯隔震橡胶支座[S].北京:人民交通出版社,2012.JT/T 822-2011Lead Rubber Bearing Isolator for Highway Bridge[S].Beijing:China Communications Press,2012.(in Chinese)
[9]叶爱君.桥梁抗震[M].北京:人民交通出版社,2011.YE Aijun.Seismic design for highway bridges[M].Beijing:China Communications Press,2011(in Chinese)
[10]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Lichu,WANG Zhiqiang.Bridge seismic isolation[M].Beijing:China Communication Press,2001.(in Chinese)
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