超高墩多塔混凝土斜拉桥纵向约束体系研究
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摘要
为探讨不同纵向约束体系对超高墩多塔混凝土斜拉桥地震响应的影响,以墩高178m的赤石特大桥为研究对象,建立全桥有限元模型并进行非线性时程分析,研究了一致和非一致2种纵向约束方式下约束刚度对结构地震反应的影响,并综合对比了各类典型纵向约束体系下结构的抗震效果,最后根据分析结果确定该新桥型的合理纵向约束体系。研究结果表明:一致纵向约束方式下,约束刚度对结构变形的影响较内力更加突出,设计时应以控制结构变形为主,设置较刚性的纵向约束对改善结构抗震性能更加有利;非一致纵向约束方式下,边塔约束刚度对各塔地震反应的分布有重要影响,合理设置边塔纵向约束刚度对平衡结构的响应分布非常关键;对于超高墩多塔斜拉桥而言,采用全漂浮体系和弹性约束体系,抗震效果均不是十分理想,而采用固结体系和弹性-固结体系,可在不显著增大结构内力的同时大幅降低结构变形,是比较合理的纵向约束体系。
To explore the influences of different longitudinal constraint systems on seismic response S of super highpier multi-span concrete cable-stayed bridges,the 178 m height Chishi bridge is taken as an object bridge. The finite element model is built to conduct the nonlinear time-history analysis. The influence of the longitudinal stiffness on the seismic behavior is analyzed,both of the uniform and non-uniform longitudinal restraint systems are considered. Then,the effects of various longitudinal constraint systems are compared to propose the reasonable longitudinal restraint system for this new type cable-stayed bridge. The analysis results indicate that the effect of the longitudinal restraint system on the displacement is more remarkable than internal force under uniform constraints and it's better to control the deformation for the bridge design; Setting up the reasonable restraint stiffness of edge towers is critical to balance the response distribution of structure under non-uniform longitudinal constraint. The floating system and elastic constraints system should not recommend to be used,while the consolidation system and elastic-consolidation system is suitable to super high-pier multi-span concrete cable-stayed bridges because they can greatly reduce the structure deformation and will not observably increase the internal force at the same time.
To explore the influences of different longitudinal constraint systems on seismic response S of super highpier multi-span concrete cable-stayed bridges,the 178 m height Chishi bridge is taken as an object bridge. The finite element model is built to conduct the nonlinear time-history analysis. The influence of the longitudinal stiffness on the seismic behavior is analyzed,both of the uniform and non-uniform longitudinal restraint systems are considered. Then,the effects of various longitudinal constraint systems are compared to propose the reasonable longitudinal restraint system for this new type cable-stayed bridge. The analysis results indicate that the effect of the longitudinal restraint system on the displacement is more remarkable than internal force under uniform constraints and it's better to control the deformation for the bridge design; Setting up the reasonable restraint stiffness of edge towers is critical to balance the response distribution of structure under non-uniform longitudinal constraint. The floating system and elastic constraints system should not recommend to be used,while the consolidation system and elastic-consolidation system is suitable to super high-pier multi-span concrete cable-stayed bridges because they can greatly reduce the structure deformation and will not observably increase the internal force at the same time.
引文
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[2]郭安辉,张门哲.沪蓉高速公路铁罗坪大桥设计[J].桥梁建设,2012(4):64-68.GUO Anhui,ZHANG Menzhe.Design of Tieluoping bridge on Shanghai-Chengdu expressway[J].Bridge Construction,2012(4):64-68.(in Chinese)
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[8]焦驰宇,李建中,彭天波.塔梁连接方式对大跨斜拉桥地震反应的影响[J].振动与冲击,2009,10:179-184,233-234.JIAO Chiyu,LI Jianzhong,PENG Tianbo.The influence of tower-girder connection on the long-span cable-stayed bridge.Journal of Vibration and Shock,2009,10:179-184,233-234.(in Chinese)
[9]李立峰,刘本永,张晨熙,等.中等跨径斜拉桥塔梁弹性约束装置的减震效应研究[J].地震工程与工程振动,2013,33(1):146-152.LI Lifeng,LIU Benyong,ZHANG Chenxi,et al.Research on the seismic performance of mid-span cable-stayed bridges with elastic constraints between tower and beam[J].Earthquake Engineering and Engineering Dynamics,2013,33(1):146-152.(in Chinese)
[10]蒋望.具有自加劲板的多塔斜拉桥双曲线索塔研究[D].长沙:湖南大学,2012.JIANG Wang.Research on hyperbolic tower with self-stiffened plate of multi-span cable-stayed bridge[D].Changsha:Hunan University,2012.(in Chinese)
[11]卢立志.多塔斜拉桥空间双曲线超高墩索塔精细化分析及试验[D].长沙:湖南大学,2011.LU Lizhi.Precise detailed analysis and experimental research on cable-tower with space hyperbolic ultra-high pier of multi-span cable-stayed bridge[D].Changsha:Hunan University,2011.(in Chinese)
[12]JTG B02-2013公路工程抗震规范[S].北京:人民交通出版社,2013.JTG B02-2013 Specification of Seismic Design for Highway Engineering[S].Beijing:China Communications Press,2013.(in Chinese)
[13]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,2009,8:1003-1009.PENG Wei,PENG Tianbo,LI Jianzhong.Research on longitudinal lonstraint systems for multi span cable-stayed bridges[J].Journal of Tongji University:Natural Science,2009,8:1003-1009.(in Chinese)
[14]陈常松,颜东煌,陈政清.岳阳洞庭湖大桥模型动力特性分析[J].中外公路,2002(6):66-69.CHEN Changsong,YAN Donghuang,CHEN Zhenqing.The dynamic characteristics analysis to the model of Yueyang Dongting Lake Bridge[J].Journal of China and Foreign Highway,2002(6):66-69.(in Chinese)
[2]郭安辉,张门哲.沪蓉高速公路铁罗坪大桥设计[J].桥梁建设,2012(4):64-68.GUO Anhui,ZHANG Menzhe.Design of Tieluoping bridge on Shanghai-Chengdu expressway[J].Bridge Construction,2012(4):64-68.(in Chinese)
[3]Gautier Y,Moretti O,Cremona C.Dynamic tests on the Millau viaduct[J].Actes des journées scientifiques du LCPC,2005:441-448.
[4]龙海滨,胡建华.汝郴高速公路赤石特大桥设计与关键技术研究[J].中外公路,2013(1):181-185.LONG Haibin,HU Jianhua.The design and research on the key technology of Chishi bridge on Ruchen highway[J].Journal of China and Foreign Highway,2013,(1):181-185.(in Chinese)
[5]范立础,胡世德,叶爱君.大跨度桥梁抗震设[M]计.北京:人民交通出版社,2001FAN Lichu,HU Shide,YE Aijun.Sesmic design of large span bridge[M].Beijing:China Communications Press,2001.(in Chinese)
[6]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):1-4.YE Aijun,HU Shide,FAN Lichu.The research on the seismic structure system of cable-stayed bridge[J].Bridge Construction,2002(4):1-4.(in Chinese)
[7]蒋伟,李洞明,李杨.塔梁间纵向弹性约束对斜拉桥抗震性能的影响[J].现代交通技术,2007(5):50-52.JIANG Wei,LI Dongming,LI Yang.The influence of longitudinal elastic constraints between the tower and girder on the seismic performance of cable-stayed bridges[J].Modern Transportation Technology,2007(5):50-52.(in Chinese)
[8]焦驰宇,李建中,彭天波.塔梁连接方式对大跨斜拉桥地震反应的影响[J].振动与冲击,2009,10:179-184,233-234.JIAO Chiyu,LI Jianzhong,PENG Tianbo.The influence of tower-girder connection on the long-span cable-stayed bridge.Journal of Vibration and Shock,2009,10:179-184,233-234.(in Chinese)
[9]李立峰,刘本永,张晨熙,等.中等跨径斜拉桥塔梁弹性约束装置的减震效应研究[J].地震工程与工程振动,2013,33(1):146-152.LI Lifeng,LIU Benyong,ZHANG Chenxi,et al.Research on the seismic performance of mid-span cable-stayed bridges with elastic constraints between tower and beam[J].Earthquake Engineering and Engineering Dynamics,2013,33(1):146-152.(in Chinese)
[10]蒋望.具有自加劲板的多塔斜拉桥双曲线索塔研究[D].长沙:湖南大学,2012.JIANG Wang.Research on hyperbolic tower with self-stiffened plate of multi-span cable-stayed bridge[D].Changsha:Hunan University,2012.(in Chinese)
[11]卢立志.多塔斜拉桥空间双曲线超高墩索塔精细化分析及试验[D].长沙:湖南大学,2011.LU Lizhi.Precise detailed analysis and experimental research on cable-tower with space hyperbolic ultra-high pier of multi-span cable-stayed bridge[D].Changsha:Hunan University,2011.(in Chinese)
[12]JTG B02-2013公路工程抗震规范[S].北京:人民交通出版社,2013.JTG B02-2013 Specification of Seismic Design for Highway Engineering[S].Beijing:China Communications Press,2013.(in Chinese)
[13]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,2009,8:1003-1009.PENG Wei,PENG Tianbo,LI Jianzhong.Research on longitudinal lonstraint systems for multi span cable-stayed bridges[J].Journal of Tongji University:Natural Science,2009,8:1003-1009.(in Chinese)
[14]陈常松,颜东煌,陈政清.岳阳洞庭湖大桥模型动力特性分析[J].中外公路,2002(6):66-69.CHEN Changsong,YAN Donghuang,CHEN Zhenqing.The dynamic characteristics analysis to the model of Yueyang Dongting Lake Bridge[J].Journal of China and Foreign Highway,2002(6):66-69.(in Chinese)
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