铁路连续梁桥减隔震设计方案研究
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摘要
为了对铁路连续梁桥减隔震设计方案进行对比研究,基于通用有限元软件SAP2000,以某三跨铁路连续梁桥为例,建立该桥的全桥有限元模型。对该桥采用铅芯橡胶支座进行减隔震设计,在7条典型地震波激励下对2种设计方案的减隔震效果进行计算分析,并将2种方案的结果进行比较。结果表明,2种隔震方案都能取得较好的隔震效果,但全桥隔震时制动墩地震响应隔震率优于制动墩隔震,且全桥隔震时梁体位移小于制动墩隔震。对铁路连续梁桥进行全桥减隔震设计,可以在较小梁体位移的前提下得到较好的隔震率,更有利于桥梁上部结构的安全。
To make a comparative study of isolation plans,a 3-span railway continuous beam bridge was chosen as the example and the finite element model of the bridge was established based on general FEA program SAP2000.The isolation effects of two design plans under seven typical earthquake waves were calculated and analyzed with the bridge isolated by lead-rubber bearings.The comparison results show that both isolation plans have good isolation efficiencies.But the isolation ratios of seismic responses for the whole bridge-isolated plan are better than those for the fixed pier-isolated plan,and the girder displacement responses for the whole bridge-isolated plan are smaller than those for the fixed pier-isolated plan.Better isolation ratios can be obtained with smaller girder displacement in whole bridge-isolated plan,which is good for the safety of the superstructure of the railway continuous beam bridge.
To make a comparative study of isolation plans,a 3-span railway continuous beam bridge was chosen as the example and the finite element model of the bridge was established based on general FEA program SAP2000.The isolation effects of two design plans under seven typical earthquake waves were calculated and analyzed with the bridge isolated by lead-rubber bearings.The comparison results show that both isolation plans have good isolation efficiencies.But the isolation ratios of seismic responses for the whole bridge-isolated plan are better than those for the fixed pier-isolated plan,and the girder displacement responses for the whole bridge-isolated plan are smaller than those for the fixed pier-isolated plan.Better isolation ratios can be obtained with smaller girder displacement in whole bridge-isolated plan,which is good for the safety of the superstructure of the railway continuous beam bridge.
引文
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[7]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):138-140.WU Bin,ZHUANG Jun-sheng.Study on mechanical characteristics of lead--rubber bearing and its application forshock reduction/Isolation in bridge engineering[J].China Railway Science,2004,25(4):138-140.
[8]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.ZHONG Tie-yi,YANG Feng-li,WU Bin.Bidirectional seismic response analysis of railway simple supporeted beambridge[J].China Railway Science,2007,28(3):38-43.
[9]杨风利,钟铁毅,夏禾.铁路简支梁桥减隔震支座设计参数的优化研究[J].铁道学报,2006,28(3):128-132.YANG Feng-li,ZHONG Tiey-i,XIA He.Study on optimization of the design parameter of seismic absorption and isolationbearing for railway simple supported beam bridges[J].Journal of the China Railway Society,2006,28(3):128-132.
[10]曾攀,阎贵平.铅芯橡胶支座动力特性对连续梁桥地震响应的影响[J].铁道学报,2001,23(5):96-101.ZENG Pan,YAN Gui-ping.Influence of dynamic characteristics of lead--rubber bearing on seismic response of continu-ous beam bridge[J]:.Journal of the China Railway Society,2001,23(5):96-101.
[2]江辉,朱晞.近断层强震速度脉冲效应及连续梁桥减隔震特性分析[J].中国安全科学学报,2003,13(12):57-62.JIANG Hui,ZHU Xi.Velocity pulse effects of near fault earthquakes and isolation characteristic of continuous girderbridge[J].China Safety Science Journal,2003,13(12):57-62.
[3]彭伟,李建中.减隔震连续梁桥非经典阻尼问题与地震响应简化分析[J].振动与冲击,2009,28(1):146-151.PENG Wei,LI Jian-zhong.Simplified analysis of seismic response for an isolated continuous girder bridge with non-classi-cal damping[J].Journal of Vibration and Shock,2009,28(1):146-151.
[4]王统宁,刘健新,于泳波.近断层地震动作用下减隔震桥梁空间动力分析[J].交通运输工程学报,2009,9(5):20-25.WANG Tong-ning,LIUJian-xin,YUYong-bo.Spatial dynamic analysis of isolated bridges subjected to near-fault groundmotion[J].Journal of Traffic and Transportation Engineering,2009,9(5):20-25.
[5]彭天波,李建中,范立础.双曲面球型减隔震支座的开发及应用[J].同济大学学报:自然科学版,2007,35(2):176-180.PENG Tian-bo,LI Jian-zhong,FANLi-chu.Development and application of double spherical aseismic bearing[J].Jour-nal of Tongji University∶Natural Science,2007,35(2):176-180.
[6]朱东生,劳远昌,沈大元,等.隔震桥梁设计参数研究[J].土木工程学报,2000,33(5):52-56.ZHU Dong-sheng,LAO Yuan-chang,SHENDa-yuan,et al.Research on some design of seismically isolated bridges[J].China Clvil Engineering Journal,2000,33(5):52-56.
[7]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):138-140.WU Bin,ZHUANG Jun-sheng.Study on mechanical characteristics of lead--rubber bearing and its application forshock reduction/Isolation in bridge engineering[J].China Railway Science,2004,25(4):138-140.
[8]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.ZHONG Tie-yi,YANG Feng-li,WU Bin.Bidirectional seismic response analysis of railway simple supporeted beambridge[J].China Railway Science,2007,28(3):38-43.
[9]杨风利,钟铁毅,夏禾.铁路简支梁桥减隔震支座设计参数的优化研究[J].铁道学报,2006,28(3):128-132.YANG Feng-li,ZHONG Tiey-i,XIA He.Study on optimization of the design parameter of seismic absorption and isolationbearing for railway simple supported beam bridges[J].Journal of the China Railway Society,2006,28(3):128-132.
[10]曾攀,阎贵平.铅芯橡胶支座动力特性对连续梁桥地震响应的影响[J].铁道学报,2001,23(5):96-101.ZENG Pan,YAN Gui-ping.Influence of dynamic characteristics of lead--rubber bearing on seismic response of continu-ous beam bridge[J]:.Journal of the China Railway Society,2001,23(5):96-101.
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