支座摩擦效应对大跨度连续梁桥的受力影响
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摘要
大跨度桥梁由于恒载较大,纵向滑动墩支座处往往存在较大的滑动摩擦力,同时由于其结构体系相对较柔,在地震作用下支座相对位移一般也较大,由此产生的摩阻耗能效应将可能对结构的抗震性能产生较大的影响。针对典型大跨度连续梁桥,应用非线性时程地震反应分析方法,研究了不同场地类型地震输入下,连续梁桥纵向活动支座摩擦效应对连续梁桥地震反应的影响,结果表明:总体上,考虑纵向活动支座摩擦效应后,活动墩的地震反应增加、固定墩的地震反应减小,但不同场地地震动输入对于增加或减小效果有较大影响。
Because of a heavier superstructure and its relatively flexible structural system of long-span continuous bridges,the sliding friction and relative displacement of sliding bearings under earthquake is often so large that the resulting energy dissipating effects of friction often have a great influence on the seismic performance of the structure.The work focuses on the effect of sliding bearing friction on the seismic behavior of typical long-span continuous girder bridges.Nonlinear time history analysis was conducted for a typical bridge model with variations on ground motion.The results shows that the seismic response of the fixed pier may increase while that of the sliding piers decrease,in general,when accounting for the friction actions of sliding bearings;however,it can also be found that different ground motions result in quite different changing amplitude.
Because of a heavier superstructure and its relatively flexible structural system of long-span continuous bridges,the sliding friction and relative displacement of sliding bearings under earthquake is often so large that the resulting energy dissipating effects of friction often have a great influence on the seismic performance of the structure.The work focuses on the effect of sliding bearing friction on the seismic behavior of typical long-span continuous girder bridges.Nonlinear time history analysis was conducted for a typical bridge model with variations on ground motion.The results shows that the seismic response of the fixed pier may increase while that of the sliding piers decrease,in general,when accounting for the friction actions of sliding bearings;however,it can also be found that different ground motions result in quite different changing amplitude.
引文
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[5]Priestley M J N.Myths and fallacies in earthquakeengineering-conflicts between design and reality,Bulletin of the New Zealand National Society forEarthquake Engineering,1993,26(3):329-341.
[6]吴陶晶,李建中,管仲国.减隔震装置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.Wu TG,Li J Z,Guan Z G.Mechanism of SeismicIsolation Devices and Applications in a Long-SpanContinuous Bridge[J].Structural Engineers,2009,25(4):104-107.(in Chinese)
[7]苏红,胡世德.连续梁桥的抗震性能分析[J].结构工程师,2002(2):36-40.Su H,Hu S D.Seismic Analysis of the Continuous BeamBridges[J].Structural Engineers,2002(2):36-40.(inChinese)
[8]黄小国,敬大德,宋小平.桥墩扭转刚度对连续梁桥横桥向地震反应的影响[J].结构工程师,2008,24(6):96-99.Huang X G,Jing D D,Song X P.The Influence of PiersTorsion Stiffness on the Earthquake Response forContinuous Bridges in the Transverse Direction[J].Structural Engineers,2008,24(6):96-99.(in Chinese)
[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):81-85.Guo L,Li J Z,Fan L C.Research on Seismic IsolationDesign for Long-Span Continuous Bridges[J].ChinaCivil Engineering Journal,2006,39(3):81-85.(inChinese)
[3]李建中,范立础.高架桥梁抗震设计[M].北京:人民交通出版社,2001.Li J Z,Fan L C.Seismic design for viaduct bridges[M].Beijing:China Communication Press,2001.(inChinese)
[4]中华人民共和国交通部.JTG D63—2007公路桥涵地基与基础设计规范[S].北京:人民交通出版社,2007.State Criteria of China.JTG D63—2007 Code forDesign of Ground Base and Foundation of HighwayBridges and Culverts[S].Beijing:China CommunicationPress,2007.(in Chinese)
[5]Priestley M J N.Myths and fallacies in earthquakeengineering-conflicts between design and reality,Bulletin of the New Zealand National Society forEarthquake Engineering,1993,26(3):329-341.
[6]吴陶晶,李建中,管仲国.减隔震装置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.Wu TG,Li J Z,Guan Z G.Mechanism of SeismicIsolation Devices and Applications in a Long-SpanContinuous Bridge[J].Structural Engineers,2009,25(4):104-107.(in Chinese)
[7]苏红,胡世德.连续梁桥的抗震性能分析[J].结构工程师,2002(2):36-40.Su H,Hu S D.Seismic Analysis of the Continuous BeamBridges[J].Structural Engineers,2002(2):36-40.(inChinese)
[8]黄小国,敬大德,宋小平.桥墩扭转刚度对连续梁桥横桥向地震反应的影响[J].结构工程师,2008,24(6):96-99.Huang X G,Jing D D,Song X P.The Influence of PiersTorsion Stiffness on the Earthquake Response forContinuous Bridges in the Transverse Direction[J].Structural Engineers,2008,24(6):96-99.(in Chinese)
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