拉索减震支座的抗震性能分析
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摘要
研制的拉索减震支座的原理为滑板支座的摩擦耗能效应和拉索的限位作用相结合,其力学特性由相关的实验结果模拟得出.以一座实际连续梁结构为背景,建立了不同支座布置形式的模型并进行比较,重点讨论了采用此拉索减震支座后的减震效果,分析了拉索减震支座计算模型中2个参数(拉索松弛的自由程和支座上下板之间摩擦系数)的合理选取问题.结果表明采用此支座能有效减小连续梁中固定墩墩底地震内力,墩、梁相对位移也在可控制范围内.适当增加支座的初始自由程或摩擦系数能提高支座的减震效果.
The developed cable-sliding friction aseismic bearing was designed by using the concept of friction energy dissipation and displacement restriction device.Numerical model of this bearing was simulated based on experimental results.Different continuous beam bridge models with different support restraints were established.The effects of seismic mitigation were compared.Some parameters including the initial free movement and the friction coefficient in the bearing model were analyzed.The results show that application of the cable-sliding friction aseismic bearing can reduce the earthquake internal force of fixed pier.The initial free movement and the friction coefficient can be properly increased to improve the effect of seismic mitigation.
The developed cable-sliding friction aseismic bearing was designed by using the concept of friction energy dissipation and displacement restriction device.Numerical model of this bearing was simulated based on experimental results.Different continuous beam bridge models with different support restraints were established.The effects of seismic mitigation were compared.Some parameters including the initial free movement and the friction coefficient in the bearing model were analyzed.The results show that application of the cable-sliding friction aseismic bearing can reduce the earthquake internal force of fixed pier.The initial free movement and the friction coefficient can be properly increased to improve the effect of seismic mitigation.
引文
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[5]吴陶晶,李建中,管仲国.减隔震装置作用机理及其在大跨度连续梁中的应用[J].结构工程师,2009,25(4):102.WU Taojing,LI Jianzhong,GUAN Zhongguo.Mechanism ofseismic isolation devices and applications in a long-spancontinuous bridge[J].Structural Engineers,2009,25(4):102.
[6]中华人民共和国交通部.JTJ391—1999公路桥梁盆式橡胶支座[S].北京:人民交通出版社,1999.Ministry of Transport of the People’s Republic of China.JTJ391—1999 Pot-type elastomeric pad bearing for highwaybridge[S].Beijing:China Communications Press,1999.
[7]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 largebridges[D].Shanghai:Tongji University,2009.
[8]Computers and Structures Inc.CSI analysis reference manualfor SAP 2000[M].Berkeley:Computers and StructuresInc,2004.
[9]雷昕弋.典型大跨度连续梁桥地震反应规律与抗震性能[D].上海:同济大学,2009.LEI Xinyi.Seismic response and performance for typical long-span continuous bridge[D].Shanghai:Tongji University,2009.
[2]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81.GUO Lei,LI Jianzhong,FAN Lichu.Research on seismicisolation design for long-span continuous bridges[J].China CivilEngineering Journal,2006,39(3):81.
[3]Tsopelas P,Constantinou M C.Experimental study of FPSsystem in bridge seismic isolation[J].Earthquake Engineeringand Structural Dynamics,1996,25:65.
[4]Almazan Jose L,De la Llera Juan C.Analytical model ofstructures with frictional pendulum isolators[J].EarthquakeEngineering and Structural Dynamics,2002,31:305.
[5]吴陶晶,李建中,管仲国.减隔震装置作用机理及其在大跨度连续梁中的应用[J].结构工程师,2009,25(4):102.WU Taojing,LI Jianzhong,GUAN Zhongguo.Mechanism ofseismic isolation devices and applications in a long-spancontinuous bridge[J].Structural Engineers,2009,25(4):102.
[6]中华人民共和国交通部.JTJ391—1999公路桥梁盆式橡胶支座[S].北京:人民交通出版社,1999.Ministry of Transport of the People’s Republic of China.JTJ391—1999 Pot-type elastomeric pad bearing for highwaybridge[S].Beijing:China Communications Press,1999.
[7]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 largebridges[D].Shanghai:Tongji University,2009.
[8]Computers and Structures Inc.CSI analysis reference manualfor SAP 2000[M].Berkeley:Computers and StructuresInc,2004.
[9]雷昕弋.典型大跨度连续梁桥地震反应规律与抗震性能[D].上海:同济大学,2009.LEI Xinyi.Seismic response and performance for typical long-span continuous bridge[D].Shanghai:Tongji University,2009.
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