隔震连续梁桥地震作用下梁间碰撞响应的研究
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摘要
铅芯橡胶支座隔震的桥梁在地震作用下相邻梁体间容易产生碰撞。以3等跨连续梁桥为对象,建立了考虑隔震支座非线性的桥梁碰撞模型,通过非线性时程分析研究了纵向地震作用下相邻联梁体间的碰撞响应。计算结果表明,隔震桥梁在地震作用下更容易发生梁间碰撞,碰撞产生相当大的撞击力,使主梁的轴力响应巨幅增大,但主梁的位移及墩的剪力、位移响应增大不明显。影响碰撞响应的主要因素是相邻联的周期比和基本周期的大小、伸缩缝间隙的大小。铅芯橡胶支座在桥梁地震碰撞中能消耗碰撞能量,可以有效地减小碰撞响应,对桥梁起到一定保护作用。
The adjacent girders of isolated bridge with lead rubber bearings are easy to collide with each other under earthquake excitation.A three equal spans continuous girder bridge model was created with consideration of impact element and the nonlinearity of lead rubber bearings.Nonlinear time-history analysis was used to investigate the response of the longitudinal seismic impact between girders.The calculation result shows that(1)the pounding action easily leads to significant impact forces between the girders of isolated bridge which increases the girder axial force response evidently but has little effect on the horizontal displacement of girder as well as the shear force and displacement at pier bottom;(2) the primary factors that affect the pounding response are the period ratio and the values of natural periods of adjacent bridge segments,and gap at expansion joint;(3) the lead rubber bearing has the function of dissipate the pounding energy and reduce the impact force between the adjacent girders to protect the bridge from damage.
The adjacent girders of isolated bridge with lead rubber bearings are easy to collide with each other under earthquake excitation.A three equal spans continuous girder bridge model was created with consideration of impact element and the nonlinearity of lead rubber bearings.Nonlinear time-history analysis was used to investigate the response of the longitudinal seismic impact between girders.The calculation result shows that(1)the pounding action easily leads to significant impact forces between the girders of isolated bridge which increases the girder axial force response evidently but has little effect on the horizontal displacement of girder as well as the shear force and displacement at pier bottom;(2) the primary factors that affect the pounding response are the period ratio and the values of natural periods of adjacent bridge segments,and gap at expansion joint;(3) the lead rubber bearing has the function of dissipate the pounding energy and reduce the impact force between the adjacent girders to protect the bridge from damage.
引文
[1]江宜城,叶志雄,聂肃非,等.方形铅芯橡胶支座力学性能试验研究及隔震桥梁地震响应分析[J].公路交通科技,2007,24(10):94-98.JIANG Yicheng,YE Zhixiong,NIE Sufei,et al.Experimen-tal Study of Mechanical Properties of Square Lead Rubber Bear-ing and Seismic Response Analysis of Isolated Bridge[J].Journal of Highway and Transportation Research and Develop-ment,2007,24(10):94-98.
[2]李忠献,张勇,岳福青.地震作用下隔震简支梁桥碰撞反应的振动台试验[J].地震工程与工程振动,2007,27(2):152-157.LI Zhongxian,ZHANG Yong,YUE Fuqing.Shaking TableTest on Pounding Responses of Simply Supported IsolatedBridges under Earthquake Excitation[J].Earthquake Engi-neering and Engineering Vibration,2007,27(2):152-157.
[3]陈学喜,朱晞,高学奎.地震作用下桥梁梁体间的碰撞响应分析[J].中国铁道科学,2005,26(6):75-78.CHENXuexi,ZHUXi,GAO Xuekui.Analysis onthe Pound-ing Responses between Adjacent Bridge Beams under Earth-quakes[J].China Railway Science,2005,26(6):75-78.
[4]CHOUWN,HONG H.Study of SSI and Non-uniform GroundMotion Effect on Pounding between Bridge Girders[J].SoilDynamics and Earthquake Engineering,2005,25:717-728.
[5]WANG C J.Failure Study of a Bridge Subjected to Poundingand Sliding under Severe Ground Motions[J].InternationalJournal of Impact Engineering,2007,34(2):216-231.
[6]谢旭,高博青,吴善幸,等.柔性橡胶支座上的桥梁结构地震碰撞响应分析[J].浙江大学学报:工学版,2004,38(6):725-741.XIE Xu,GAO Boqing,WUShanxing,et al.Earthquake Re-sponse of Bridges Bearing on Flexible Rubber ConsideringPounding of Girders[J].Journal of Zhejiang University:En-gineering Science Edition,2004,38(6):725-741.
[7]王军文,李建中,范立础.桥梁结构地震碰撞效应及防落梁措施研究现状[J].公路交通科技,2007,24(5):71-75.WANG Junwen,LI Jianzhong,FAN Lichu.State of Art ofCurrent Studies onthe Effect of Seismic Induced Pounding be-tween Adjacent Bridge Decks and Falling-off Prevention Mea-sures[J].Journal of Highway and Transportation Researchand Development,2007,24(5):71-75.
[8]王东升,杨海红,王国新.考虑邻梁碰撞的多跨长简支梁桥落梁震害分析[J].中国公路学报,2005,18(3):54-59.WANG Dongsheng,YANG Haihong,WANG Guoxin.SeismicAnalysis of Girders Falling down in Multi-span Long SimplySupported Bridges with Adjacent Pounding Effect[J].ChinaJournal of Highway and Transport,2005,18(3):54-59.
[9]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-165.WANG Dongsheng,FENG Qimin,WANG Guoxin.AnalysisModel of Pounding Between Adjacent Bridge Girders duringEarthquakes Based on Collinear Impact between Rods[J].Engineering Mechanics,2004,21(2):157-165.
[10]JANKOWSKI R,WILDE K,FUJINO Y.Reduction of Pound-ing Effectsin Elevated Bridges During Earthquakes[J].Earth-quake Eng.Stru.Dyn.,2000,29(2):195-212.
[2]李忠献,张勇,岳福青.地震作用下隔震简支梁桥碰撞反应的振动台试验[J].地震工程与工程振动,2007,27(2):152-157.LI Zhongxian,ZHANG Yong,YUE Fuqing.Shaking TableTest on Pounding Responses of Simply Supported IsolatedBridges under Earthquake Excitation[J].Earthquake Engi-neering and Engineering Vibration,2007,27(2):152-157.
[3]陈学喜,朱晞,高学奎.地震作用下桥梁梁体间的碰撞响应分析[J].中国铁道科学,2005,26(6):75-78.CHENXuexi,ZHUXi,GAO Xuekui.Analysis onthe Pound-ing Responses between Adjacent Bridge Beams under Earth-quakes[J].China Railway Science,2005,26(6):75-78.
[4]CHOUWN,HONG H.Study of SSI and Non-uniform GroundMotion Effect on Pounding between Bridge Girders[J].SoilDynamics and Earthquake Engineering,2005,25:717-728.
[5]WANG C J.Failure Study of a Bridge Subjected to Poundingand Sliding under Severe Ground Motions[J].InternationalJournal of Impact Engineering,2007,34(2):216-231.
[6]谢旭,高博青,吴善幸,等.柔性橡胶支座上的桥梁结构地震碰撞响应分析[J].浙江大学学报:工学版,2004,38(6):725-741.XIE Xu,GAO Boqing,WUShanxing,et al.Earthquake Re-sponse of Bridges Bearing on Flexible Rubber ConsideringPounding of Girders[J].Journal of Zhejiang University:En-gineering Science Edition,2004,38(6):725-741.
[7]王军文,李建中,范立础.桥梁结构地震碰撞效应及防落梁措施研究现状[J].公路交通科技,2007,24(5):71-75.WANG Junwen,LI Jianzhong,FAN Lichu.State of Art ofCurrent Studies onthe Effect of Seismic Induced Pounding be-tween Adjacent Bridge Decks and Falling-off Prevention Mea-sures[J].Journal of Highway and Transportation Researchand Development,2007,24(5):71-75.
[8]王东升,杨海红,王国新.考虑邻梁碰撞的多跨长简支梁桥落梁震害分析[J].中国公路学报,2005,18(3):54-59.WANG Dongsheng,YANG Haihong,WANG Guoxin.SeismicAnalysis of Girders Falling down in Multi-span Long SimplySupported Bridges with Adjacent Pounding Effect[J].ChinaJournal of Highway and Transport,2005,18(3):54-59.
[9]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-165.WANG Dongsheng,FENG Qimin,WANG Guoxin.AnalysisModel of Pounding Between Adjacent Bridge Girders duringEarthquakes Based on Collinear Impact between Rods[J].Engineering Mechanics,2004,21(2):157-165.
[10]JANKOWSKI R,WILDE K,FUJINO Y.Reduction of Pound-ing Effectsin Elevated Bridges During Earthquakes[J].Earth-quake Eng.Stru.Dyn.,2000,29(2):195-212.
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