近远场地震作用下基于摩擦摆支座的高速铁路连续梁桥减隔震研究
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摘要
以1座跨径布置为(60+100+60)m高速铁路预应力混凝土连续梁为研究对象,采用SAP2000软件建立基于CRTSⅡ型板式无砟轨道系统的线桥一体化模型,运用非线性时程分析法,考虑近远场地震动,进行基于摩擦摆支座的高速铁路连续梁桥减隔震研究。结果表明:对于中小跨径高速铁路连续梁桥,在远场地震动下,主墩支座采用摩擦摆支座,联间墩支座采用普通盆式支座,可实现与全桥采用摩擦摆支座相当的减隔震效果;在近场地震动下,采用摩擦摆支座应用于主墩,普通盆式支座配合减震榫应用于联间墩,在避免邻梁碰撞的同时也可达到预期的减隔震效果;轨道约束系统对墩梁相对位移的限制及联间墩支座承担梁体质量较小是造成应用于联间墩的摩擦摆支座减隔震效果不佳的主要原因。
A prestressed concrete continuous beam with the span arrangement of(60+100+60)m for high speed railway was taken as the research object.The integrated model of track and bridge based on CRTSⅡslab ballastless track system was set up by SAP2000 software.The seismic mitigation and isolation of continuous beam bridge for high speed railway based on friction pendulum bearing were studied by using nonlinear time history analysis method and considering near-and-far field ground motions.Results show that,for continuous beam bridges with small and medium spans of high speed railway under far-field ground motions,the main pier bearings adopt friction pendulum bearings and the joint pier bearings adopt ordinary pot bearings,which can achieve the same vibration reduction and isolation effects as the full bridge with friction pendulum bearings.Under near-field ground motions,the main pier bearings adopt the friction pendulum bearings and the joint pier bearings adopt the ordinary pot bearings and vibration absorbers,which can avoid the collision between adjacent beams and at the same time achieve the expected seismic mitigation and isolation effects.The main reasons for the poor seismic mitigation and isolation effects of the friction pendulum bearings applied to the joint pier are the limitation of the rail constraint system to the pier-beam relative displacement and the smaller mass of the beam body of the joint pier bearing.
A prestressed concrete continuous beam with the span arrangement of(60+100+60)m for high speed railway was taken as the research object.The integrated model of track and bridge based on CRTSⅡslab ballastless track system was set up by SAP2000 software.The seismic mitigation and isolation of continuous beam bridge for high speed railway based on friction pendulum bearing were studied by using nonlinear time history analysis method and considering near-and-far field ground motions.Results show that,for continuous beam bridges with small and medium spans of high speed railway under far-field ground motions,the main pier bearings adopt friction pendulum bearings and the joint pier bearings adopt ordinary pot bearings,which can achieve the same vibration reduction and isolation effects as the full bridge with friction pendulum bearings.Under near-field ground motions,the main pier bearings adopt the friction pendulum bearings and the joint pier bearings adopt the ordinary pot bearings and vibration absorbers,which can avoid the collision between adjacent beams and at the same time achieve the expected seismic mitigation and isolation effects.The main reasons for the poor seismic mitigation and isolation effects of the friction pendulum bearings applied to the joint pier are the limitation of the rail constraint system to the pier-beam relative displacement and the smaller mass of the beam body of the joint pier bearing.
引文
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[13]钟铁毅,吕吉应,张常勇.铁路隔震连续梁桥地震碰撞响应研究[J].中国铁道科学,2012,33(3):16-20.(ZHONG Tieyi,LJiying,ZHANG Changyong.Study on the Seismic Pounding Responses of Seismically Isolated Railway Continuous Beam Bridge[J].China Railway Science,2012,33(3):16-20.in Chinese)
[14]王常峰,包仪军,陈兴冲,等.活动支座状态对桥梁弹塑性地震反应的影响[J].公路交通科技,2015,32(3):75-81.(WANG Changfeng,BAO Yijun,CHEN Xingchong,et al.Effect of State of Movable Support on Elasto-Plastic Seismic Response of Bridge[J].Journal of Highway and Transportation Research and Development,2015,32(3):75-81.in Chinese)
[15]王常峰,朱春林,陈兴冲.活动支座摩擦作用对连续梁桥弹塑性地震反应的影响[J].公路交通科技,2013,30(5):67-73.(WANG Changfeng,ZHU Chunlin,CHEN Xingchong.Effect of Friction Effect at Movable Support on ElastoPlastic Seismic Response of Continuous Girder Bridge[J].Journal of Highway and Transportation Research and Development,2013,30(5):67-73.in Chinese)
[16]贾毅,赵人达,廖平等.罕遇地震作用下连续梁桥双曲面摩擦摆支座参数优化及减震效果研究[J].中国铁道科学,2018,39(3):31-39.(JIA Yi,ZHAO Renda,LIAO Ping,et al.Parameter Optimization and Damping Effect of Hyperbolic Surface Friction Pendulum Bearing for Continuous Girder Bridge under Rare Earthquake[J].China Railway Science,2018,39(3):31-39.in Chinese)
[2]贾俊峰,杜修力,韩强.近断层地震动特性及其对工程结构影响的研究进展[J].建筑结构学报,2015,36(1):1-12.(JIA Junfeng,DU Xiuli,HAN Qiang.A State-of-the-Art Review of Near-Fault Earthquake Ground Motion Characteristics and Effects on Engineering Structures[J].Journal of Building Structures,2015,36(1):1-12.in Chinese)
[3] PARK S W,GHASEMI H,SHEN J,et al.Simulation of the Seismic Performance of the Bolu Viaduct Subjected to Near-Fault Ground Motions[J].Earthquake Engineering and Structural Dynamics,2004,33,(13),1249-1270.
[4] MARTNEZ-RODRIGO M D,FILIATRAULT A.A Case Study on the Application of Passive Control and Seismic Isolation Techniques to Cable-Stayed Bridges:a Comparative Investigation through Non-Linear Dynamic Analyses[J].Engineering Structures,2015,99(9):232-252.
[5]汤虎,李建中.连续梁桥固定墩减震设计方法研究[J].土木工程学报,2011,44(12):64-72.(TANG Hu,LI Jianzhong.Study of Earthquake-Reduction Design for the Fixed Pier of Continuous Bridges[J].China Civil Engineering Journal,2011,44(12):64-72.in Chinese)
[6]石岩,王东升,孙治国.近断层地震动下减隔震桥梁地震反应分析[J].桥梁建设,2014,44(3):19-24.(SHI Yan,WANG Dongsheng,SUN Zhiguo.Analysis of Seismic Response of Seismically Mitigated and Isolated Bridge Subjected to Near-Fault Ground Motion[J].Bridge Construction,2014,44(3):19-24.in Chinese)
[7] GUAN Z G,YOU H,LI J Z.Lateral Isolation System of a Long-Span Cable-Stayed Bridge with Heavy-Weight Concrete Girder in a High Seismic Region[J].Journal of Bridge Engineering,2016,22(1):1-15.
[8]李建中,汤虎,管仲国.中小跨径板式橡胶支座梁桥新型隔震系统[J].中国公路学报,2015,28(3):35-43.(LI Jianzhong,TANG Hu,GUAN Zhongguo.A New Isolation System for Small and Medium Span Bridges on Laminated Rubber Bearing[J].China Journal of Highway and Transport,2015,28(3):35-43.in Chinese)
[9]叶爱君,方家欣,张少为,等.小箱梁桥横向减震体系及其耗能特性[J].中国公路学报,2017,30(12):21-29.(YE Aijun,FANG Jiaxin,ZHANG Shaowei,et al.Transverse Seismic System of Multi-Box Girder Bridge and Its Energy Dissipation Characteristics[J].China Journal of Highway and Transport,2017,30(12):21-29.in Chinese)
[10]高建强,张永亮,陈兴冲,等.无砟轨道系统对铁路减隔震桥梁地震响应的影响[J].世界地震工程,2017,33(1):202-208.(GAO Jianqiang,ZHANG Yongliang,CHEN Xingchong,et al.Effect of Ballastless Track System on Seismic Response of Seismic Isolated Railway Bridges[J]. World Earthquake Engineering,2017,33(1):202-208.in Chinese)
[11]李承根,高日.高速铁路桥梁减震技术研究[J].中国工程科学.2009,11(1):81-86.(LI Chenggen,GAO Ri.Study on the Shock Absorbing Technique of High Speed Railway Bridge[J].Engineering Sciences,2009,11(1):81-86.in Chinese)
[12]石岩,王东升,孙治国.近断层地震动下的高速铁路桥梁减震设计[J].中国铁道科学,2014,35(6),34-40.(SHI Yan,WANG Dongsheng,SUN Zhiguo.Seismic Isolation Design for High Speed Railway Bridge under NearFault Ground Motions[J].China Railway Science,2014,35(6):34-40.in Chinese)
[13]钟铁毅,吕吉应,张常勇.铁路隔震连续梁桥地震碰撞响应研究[J].中国铁道科学,2012,33(3):16-20.(ZHONG Tieyi,LJiying,ZHANG Changyong.Study on the Seismic Pounding Responses of Seismically Isolated Railway Continuous Beam Bridge[J].China Railway Science,2012,33(3):16-20.in Chinese)
[14]王常峰,包仪军,陈兴冲,等.活动支座状态对桥梁弹塑性地震反应的影响[J].公路交通科技,2015,32(3):75-81.(WANG Changfeng,BAO Yijun,CHEN Xingchong,et al.Effect of State of Movable Support on Elasto-Plastic Seismic Response of Bridge[J].Journal of Highway and Transportation Research and Development,2015,32(3):75-81.in Chinese)
[15]王常峰,朱春林,陈兴冲.活动支座摩擦作用对连续梁桥弹塑性地震反应的影响[J].公路交通科技,2013,30(5):67-73.(WANG Changfeng,ZHU Chunlin,CHEN Xingchong.Effect of Friction Effect at Movable Support on ElastoPlastic Seismic Response of Continuous Girder Bridge[J].Journal of Highway and Transportation Research and Development,2013,30(5):67-73.in Chinese)
[16]贾毅,赵人达,廖平等.罕遇地震作用下连续梁桥双曲面摩擦摆支座参数优化及减震效果研究[J].中国铁道科学,2018,39(3):31-39.(JIA Yi,ZHAO Renda,LIAO Ping,et al.Parameter Optimization and Damping Effect of Hyperbolic Surface Friction Pendulum Bearing for Continuous Girder Bridge under Rare Earthquake[J].China Railway Science,2018,39(3):31-39.in Chinese)