基于摩擦摆支座的城市大跨连续梁桥减震性能研究
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摘要
为研究摩擦摆支座在提高城市大跨连续梁桥抗震性能上的适用性,以位于8度区的(90+170+90)m某城市大跨连续梁桥为研究对象,对该桥摩擦摆支座进行设计,并采用非线性时程反应分析法研究摩擦摆支座的减震效果。结果表明:摩擦摆支座对城市大跨连续梁桥下部结构的纵、横向内力减震效果显著;从自复位能力的角度,摩擦摆支座的摩擦系数取值不宜过大,应根据非线性时程反应分析获得的支座最大位移量验算摩擦摆支座的自复位能力;由于该桥上部结构恒载较大,摩擦摆固定支座的静摩擦力远大于全桥的制动力,因此在不设置剪力键的条件下,也能满足桥梁的正常使用功能。
To study the applicability of friction pendulum bearings in enhancing the seismic performance of urban long-span continuous girder bridge,a bridge with span arrangement of(90+170+90)m in the area of 8degree seismic intensity is taken as the study background.Designs were undertaken to the friction pendulum bearings of the bridge,and the non-linear timehistory response analysis method was used to study the seismic mitigation effect of the friction pendulum bearings.The results of the analysis indicate that friction pendulum bearings exhibit remarkable seismic mitigation effect on the longitudinal and transverse internal force of the substructures of the urban long-span continuous girder bridges.From the perspective of self-reset ability,the values of friction coefficient of the friction pendulum bearings should not be very great,and the self-reset ability of the friction pendulum bearings should be checked according to the maximum displacement amount of the bearings gained by the non-linear time-history response analysis.Because the dead load of the superstructure of the bridge is great,the static friction force of the fixed friction pendulum bearings is far greater than the braking force of the whole bridge,which is able to satisfy the requirements of the normal operation of the bridge in the context that no shear stud connectors are installed.
To study the applicability of friction pendulum bearings in enhancing the seismic performance of urban long-span continuous girder bridge,a bridge with span arrangement of(90+170+90)m in the area of 8degree seismic intensity is taken as the study background.Designs were undertaken to the friction pendulum bearings of the bridge,and the non-linear timehistory response analysis method was used to study the seismic mitigation effect of the friction pendulum bearings.The results of the analysis indicate that friction pendulum bearings exhibit remarkable seismic mitigation effect on the longitudinal and transverse internal force of the substructures of the urban long-span continuous girder bridges.From the perspective of self-reset ability,the values of friction coefficient of the friction pendulum bearings should not be very great,and the self-reset ability of the friction pendulum bearings should be checked according to the maximum displacement amount of the bearings gained by the non-linear time-history response analysis.Because the dead load of the superstructure of the bridge is great,the static friction force of the fixed friction pendulum bearings is far greater than the braking force of the whole bridge,which is able to satisfy the requirements of the normal operation of the bridge in the context that no shear stud connectors are installed.
引文
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[2]张永亮,孙建飞,徐家林.高速铁路大跨连续梁桥地震反应分析及抗震校核[J].地震工程学报,2013,35(2):226-231.
[3]张永亮,孙建飞,徐家林.京沪高速铁路沧德特大桥地震反应分析[J].世界桥梁,2013,41(6):43-47.
[4]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桥中的应用[J].结构工程师,2009,25(4):102-107.
[5]王晓黎.某高速铁路连续梁桥桥墩地震反应分析[J].世界桥梁,2012,40(4):38-41.
[6]宋松林,武星.应用摩擦摆支座的连续梁桥地震响应分析[J].公路,2013,(6):115-118.
[7]夏修身.铁路连续梁拱组合桥基于摩擦摆支座的减隔震研究[J].西北地震学报,2012,34(4):350-354.
[8]陆树荣.基于摩擦摆系统模型的桥梁地震响应[J].防灾减灾工程学报,2010,(1):32-35.
[9]王葆茜,王冲.强震作用下连续梁桥的减隔震控制研究[J].工程抗震与加固改造,2013,35(3):71-76.
[10]庄军生.桥梁减震、隔震支座和装置[M].北京:中国铁道出版社,2012.
[11]龚健,邓雪松,周云.摩擦摆隔震支座理论分析与数值模拟研究[J].防灾减灾工程学报,2011,31(1):56-62.
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