地震作用下斜交连续梁桥碰撞效应分析
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摘要
了解强烈地震下上部梁体结构与桥台间碰撞效应对斜交连续梁桥的地震反应影响十分重要,以唐子河大桥为原型,建立了不同斜度的斜交连续梁桥非线性有限元计算分析模型.利用非线性时程分析方法,对比研究了不考虑碰撞效应和考虑碰撞效应两种情况下的斜交连续梁桥地震反应特征规律.结果表明:梁体与桥台间的碰撞效应会使斜交连续梁桥的上部结构产生扭转位移,且随着斜度的增大而增大;考虑碰撞作用的桥墩最大扭矩明显大于不考虑碰撞作用的桥墩最大扭矩.在斜交连续梁桥的抗震设计过程中如不考虑这种碰撞作用,会低估桥墩的地震扭矩效应,增大下部墩柱结构的设计风险.
In order to study the effect of collision between the superstructure and abutment on the seismic response of skew continuous bridges,the Tangzihe bridge was used as a prototype,nonlinear finite element models of skew continuous bridges with different skew angles were developed.The characteristic of seismic response of skew continuous bridge with the collision effect considered or not were studied using a nonlinear time history analysis method.The results show that the torsional displacement of superstructure will be induced by the collision and increase with the increasing of skew angle.The maximum seismic torques in the piers of the skew continuous bridge calculated with the collision effects considered are obviously larger than that calculated without the collision effects considered.If the collision effect was ignored during the process of seismic design,the seismic torque would be underestimated and the risk of seismic damage might be improved.
In order to study the effect of collision between the superstructure and abutment on the seismic response of skew continuous bridges,the Tangzihe bridge was used as a prototype,nonlinear finite element models of skew continuous bridges with different skew angles were developed.The characteristic of seismic response of skew continuous bridge with the collision effect considered or not were studied using a nonlinear time history analysis method.The results show that the torsional displacement of superstructure will be induced by the collision and increase with the increasing of skew angle.The maximum seismic torques in the piers of the skew continuous bridge calculated with the collision effects considered are obviously larger than that calculated without the collision effects considered.If the collision effect was ignored during the process of seismic design,the seismic torque would be underestimated and the risk of seismic damage might be improved.
引文
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[2]MARGAKIS E A,JENNINGS P C.Analytical mod-els for rigid body motions of skew bridges[J].Earth-quake Engineering and Structural Dynamics,1987,15(2):923-944.
[3]WAKEFIELD R R,NAZMY A S,BILLINGTON DP.Analysis of seismic failure in skew RC bridge[J].Journal of Structural Engineering,1991,117(3):9720-9726.
[4]MENG J Y,LUI E M.Seismic analysis and assess-ment of a skew highway bridge[J].Earthquake Engi-neering and Structural Dynamics,2000,22(11):1433-1452.
[5]何旭辉,盛兴旺,陈政清.高速铁路PC斜交箱梁桥振动特性模型试验研究[J].铁道学报,2002,24(5):89-92.HE Xu-hui,SHEN Xing-wang,CHEN Zheng-qing.Model test study of vibration characteristics on PCskew box girder bridge of civil high speed railway[J].Journal of the China Railway Society,2002,24(5):89-92.
[6]MENG J Y,HAMID G,LUI E M.Analytical andexperimental study of a skew bridge model[J].En-gineering Structures,2004,26(2):1127-1142.
[7]MALEKI S,BISADI V.Orthogonal effects in seis-mic analysis of skewed bridges[J].Journal of BridgeEngineering,2006,11(1):122-129.
[8]MALEKI S.Deck modeling for seismic analysis ofskewed slab-girder bridges[J].Engineering Struc-tures,2002,24(10):1315-1326.
[9]卓秋林.公路简支斜交梁桥地震反应分析[D].福州:福州大学土木工程学院,2004.
[10]陈晋阳.公路连续斜交梁桥地震反应分析[D].福州:福州大学土木工程学院,2007.
[11]张培君.非规则梁桥地震反应分析[D].上海:同济大学土木工程学院,2005.
[12]DIMITRAKOPOULOS E G.Seismic response anal-ysis of skew bridges with pounding deck-abutmentjoints[J].Engineering Structures,2011,33(3):813-826.
[13]重庆交通科研设计院.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[14]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Jun-wen,LI Jian-zhong,FAN Li-chu.Par-ametric study of longitudinal seismic pounding re-sponse for continuous girder bridges[J].ChinaJournal of Highway and Transport,2005,18(4):42-47.
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