地震作用下大跨度斜拉桥和引桥间碰撞分析
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摘要
强烈地震作用下大跨度斜拉桥和引桥(一般是简支梁桥或多跨连续梁桥)的纵向振动是耦合的,可能发生碰撞及落梁。采用非线性时程地震反应方法分析了梁端的纵向碰撞效应对体系整体反应的影响,其中对碰撞接触单元的刚度进行了比较分析,然后分别讨论了影响碰撞的几种因素,主要是伸缩缝初始间隙大小、相邻结构周期比等的影响。结果表明碰撞对引桥影响相对较大。
Vibrations of long-span cable-stayed bridge and its approach bridges are usually coupled under severe earthquake excitations.Longitudinal coupling motion may cause pounding between main and approach bridges or even falling down of main girders.The analysis was conducted with a specific model of cable-stayed bridge.The pounding effects at the movement joints were discussed and the influences of different impact stiffness were evaluated.The effects of some parameters including structural period ratio of adjacent bridge segments and initial gap size at expansion joints were investigated.The results show that the pounding effects on approach bridges are more evident.
Vibrations of long-span cable-stayed bridge and its approach bridges are usually coupled under severe earthquake excitations.Longitudinal coupling motion may cause pounding between main and approach bridges or even falling down of main girders.The analysis was conducted with a specific model of cable-stayed bridge.The pounding effects at the movement joints were discussed and the influences of different impact stiffness were evaluated.The effects of some parameters including structural period ratio of adjacent bridge segments and initial gap size at expansion joints were investigated.The results show that the pounding effects on approach bridges are more evident.
引文
[1]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
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[4]Anagnostopoulos S A.Earthquake induced pounding:State of the art[C].Proceedings of the10th European conference.Austria,1995,897-905.
[5]Anagnostopoulos S A.Building pounding re-examined:How serious a problem is it-[C].Proceedings of the11th WCEE,Acapulco,Mexico,1996,23-28.
[6]Davis R O.Pounding of buildings modelled by an impact os-cillator[J].Earthquake Engineering and Structural Dynam-ics,1992,21:253-274.
[7]Chau K T,Wei X X.Pounding of structures modeled as non-linear impacts of two oscillators[J].Earthquake Engineering and Structural Dynamics,2001,30.
[8]Chau K T,Wei X X,Guo X,et al.Experimental and theoret-ical simulations of seismic poundings between two adjacent structures[J].Earthquake Engineering and Structural Dynamics,2003,32:537-554.
[9]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.
[10]Roches R D,Fenves G L.Design procedures for hinge restrainers and hinge sear width for multiple-frame bridges[S].MCEER-98-0013.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[3]Maison B F,kasai K.Analysis for type of structural pounding[J],Struct.Eng.ASCE,1990,116(4):957-977.
[4]Anagnostopoulos S A.Earthquake induced pounding:State of the art[C].Proceedings of the10th European conference.Austria,1995,897-905.
[5]Anagnostopoulos S A.Building pounding re-examined:How serious a problem is it-[C].Proceedings of the11th WCEE,Acapulco,Mexico,1996,23-28.
[6]Davis R O.Pounding of buildings modelled by an impact os-cillator[J].Earthquake Engineering and Structural Dynam-ics,1992,21:253-274.
[7]Chau K T,Wei X X.Pounding of structures modeled as non-linear impacts of two oscillators[J].Earthquake Engineering and Structural Dynamics,2001,30.
[8]Chau K T,Wei X X,Guo X,et al.Experimental and theoret-ical simulations of seismic poundings between two adjacent structures[J].Earthquake Engineering and Structural Dynamics,2003,32:537-554.
[9]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.
[10]Roches R D,Fenves G L.Design procedures for hinge restrainers and hinge sear width for multiple-frame bridges[S].MCEER-98-0013.
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