预应力混凝土大跨连续梁桥隔震设计
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摘要
大跨预应力混凝土连续梁桥由于质量庞大,地震作用往往成为控制该类结构设计的主要因素。理论分析表明,处于地震高烈度地区桥梁的地震反应对结构参数变动十分敏感。加大构件截面或增加固定墩数量虽可提高结构的抗震能力,但同时也会使结构的地震反应迅速增加,反而使结构抗震能力需求缺口进一步扩大,因此按常规抗震设计思路进行抗震设计往往无法达到抗震设防目标。选用具有隔震和耗能双重功能的摩擦摆支座对桥梁进行减隔震设计,可大幅降低墩底内力,并使主梁相对于墩顶的位移控制在可接受范围内,满足结构的抗震需求。通过对摩擦摆支座滑动曲面半径和摩擦面滑动摩擦系数等参数的优化分析,得出了减隔震装置参数选取的基本原则。
Earthquake action is often a major factor of structure design controlling of large-span prestressed concrete continuous girder bridge for their huge mass.Theoretical analysis shows that the seismic response of the bridge in the high-intensity earthquake regions is very sensitive towards the structural parameter change.Although the seismic capacity of the structure can be improved by increasing cross-section area or the number of fixed piers,it will make the seismic effect of the structure increase rapidly which will enlarge the demand of seismic capacity,so seismic design in accordance with conventional thinking is often impossible to meet the goal of seismic fortification.Appling the friction pendulum isolators which have dual function of isolation and energy consumption for seismic design of the bridge can largely reduce the internal force of piers at the bottom and control the relative displacement between the girder and pier top within acceptable range to meet the demand of seismic design.Based on optimization analysis of friction pendulum isolator on the sliding curved surface radius and the sliding friction coefficient in sliding surface parameters,the basic principles of how to select isolator parameters were deduced.
Earthquake action is often a major factor of structure design controlling of large-span prestressed concrete continuous girder bridge for their huge mass.Theoretical analysis shows that the seismic response of the bridge in the high-intensity earthquake regions is very sensitive towards the structural parameter change.Although the seismic capacity of the structure can be improved by increasing cross-section area or the number of fixed piers,it will make the seismic effect of the structure increase rapidly which will enlarge the demand of seismic capacity,so seismic design in accordance with conventional thinking is often impossible to meet the goal of seismic fortification.Appling the friction pendulum isolators which have dual function of isolation and energy consumption for seismic design of the bridge can largely reduce the internal force of piers at the bottom and control the relative displacement between the girder and pier top within acceptable range to meet the demand of seismic design.Based on optimization analysis of friction pendulum isolator on the sliding curved surface radius and the sliding friction coefficient in sliding surface parameters,the basic principles of how to select isolator parameters were deduced.
引文
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[3]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,HU Shide,YE Aijun.Seismic Design for Long-span Bridges[M].Beijing:China Communications Press,2001.
[4]李爱群,高世振.工程结构抗震与防灾[M].南京:东南大学出版社,2003.LI Aiqun,GAO Shizhen.Seismic Resistance and Disaster Pre-vention of Engineering Structure[M].Nanjing:SoutheastUniversity Press,2003.
[5]DICLELI M,MANSOUR M Y.Seismic Retrofitting of HighwayBridges in Illinois Using Friction Pendulum Seismic IsolationBearings and Modeling Procedures[J].Engineering Struc-tures,2003(25):1139-1156.
[6]徐秀丽,刘伟庆,李龙安,等.斜拉桥结构减震设计优化研究[J].地震工程与工程振动,2006,26(2):122-123.XU Xiuli,LIU Weiqing,LI Long’an,et al.Optimized Earth-quake Reduction of Cable-stayed Bridge[J].EarthquakeEngineering and Engineering Vibration,2006,26(2):122-123.
[7]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37-41.WANG Zhiqiang,HU Shide,FAN Lichu.Research on ViscousDamper Parameters of Donghai Bridge[J].China Journal ofHighway and Transport,2005,18(3):37-41.
[8]蒋建军,李建中,范立础.桥梁板式橡胶支座与粘滞阻尼器组合使用的减震性能研究[J].公路交通科技,2005,22(8):44-48.JIANG Jianjun,LI Jianzhong,FAN Lichu.Study on AseismicPerformance of Combination of Laminated Rubber Bearing andViscous Damper for Bridge[J].Journal of Highway andTransportation Research and Development,2005,22(8):44-48.
[9]刘延芳,叶爱君.减隔震技术在桥梁结构中的应用[J].世界地震工程,2008,24(2):131-136.LIU Yanfang,YE Aijun.Seismic Isolation in Bridge Engineer-ing[J].World Earthquake Engineering,2008,24(2):131-136.
[10]王常峰,陈兴冲.竖向地震动对桥梁结构地震反应的影响[J].振动与冲击,2007,26(6):31-35.WANG Changfeng,CHEN Xingchong.Effect of Vertical Exci-tation on the Seismic Performance of Bridge Structure[J].Journal of Vibration and Shock,2007,26(6):31-35.
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu,Earthquake Resistance of Bridges[M].Shang-hai:Tongji University Press,1997.
[12]M J N普瑞斯特雷,F塞勃勒,G M卡尔维,等.桥梁抗震设计与加固[M].北京:人民交通出版社,1999.PRIESTLEY M J N,SEIBLE F,CALVI G M,et al.SeismicDesign and Retrofit of Bridges[M].Beijing:China Commu-nications Press,1999.
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