碰撞刚度与间隙对大跨减隔震铁路连续梁桥防落梁设计的影响分析
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摘要
传统的桥梁防落梁装置设计采用规范规定按照构造措施进行处理,多由设计人员凭经验设计,设计不当往往容易导致梁体局部损坏甚至落梁事故的发生。当前越来越多的大跨重要性桥梁采用了减隔震技术进行设计,然而规范并没有对该类桥梁的防落梁装置设计给出相关规定,给防落梁装置的设计造成了一定的困难。本文以一联四跨铁路连续梁桥的防落梁装置设计过程为例,采用非线性时程分析法,分析了碰撞刚度、纵、横向间隙大小对撞击力及防落梁设计的影响规律。最后本文提出了强震下某大跨连续梁桥防落梁设计的原则,计算结果可为大跨减隔震桥梁防落梁的设计提供参考。
The conventional collapse-proof system design is taken as conformation measures based on designer's experiences,and a bad design often leads to the damages even or collapse of the bridges. Now more and more important and large span bridges which applied isolated devices are designed,however the codes haven't given clear rules about how to design collapse-proof system for these kinds of bridges,which bring puzzles for designers. Take a four spans railway continuous girder bridge as example,nonlinear time-history method is used to analyze the influence laws of pounding stiffness and the longitudinal or transverse gap for pounding force and collapse-proof system design. Finally the design rules of collapse-proof system of the large span continuous girder bridge are brought forward; these results could be clues for the collapse-proof system design of large span isolated bridge.
The conventional collapse-proof system design is taken as conformation measures based on designer's experiences,and a bad design often leads to the damages even or collapse of the bridges. Now more and more important and large span bridges which applied isolated devices are designed,however the codes haven't given clear rules about how to design collapse-proof system for these kinds of bridges,which bring puzzles for designers. Take a four spans railway continuous girder bridge as example,nonlinear time-history method is used to analyze the influence laws of pounding stiffness and the longitudinal or transverse gap for pounding force and collapse-proof system design. Finally the design rules of collapse-proof system of the large span continuous girder bridge are brought forward; these results could be clues for the collapse-proof system design of large span isolated bridge.
引文
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[8]冯亚成.高速铁路桥梁支座系统[J].世界桥梁,2011,150(2):15-17.FENG Yacheng.High speed railway bridge bearing system[J].World Bridges,2011,150(2):15-17.(in Chinese)
[2]GB50111-2006,铁路工程抗震设计规范(2009年版)[S].北京:中国计划出版社,2008.GB50111-2006 Code for Seismic Design of Railway Engineering(2009)[S].Beijing:Chinese Planning Press,2008.(in Chinese)
[3]孟杰,刘钊.汶川地震中的桥梁落梁震害分析及启示[J].结构工程师,2010,26(2):95-100.MENG Jie,LIU Zhao.Analysis and apocalypses of girder collapse in Wen-Chuan earthquake[J].Structural Engineer,2010,26(2):95-100.(in Chinese)
[4]朱万旭,黄颖,杨帆,等.地震区简支梁桥防落梁装置的设计[J].特种结构,2011,28(3):66-70.ZHU Wanxu,HUANG Yin,YANG Fan,et al.The design of collapse-proof equipment for simple-supported bridges in earthquake zone[J].The special structure of Journal,2011,28(3):66-70.(in Chinese)
[5]石岩,王军文,王东升,等.地震作用下高速铁路简支箱梁桥横向偏心碰撞反应分析[J].铁道学报,2013,35(2):99-105.SHI Yan,WANG Junwen,WANG Dongshen,et al.Analysis on eccentric pounding responses of simply-supported box girder bridges on highspeed railways under transverse earthquake[J].Journal of the China Railway Society,2013,35(2):99-105.(in Chinese)
[6]李承根,高日.高速铁路桥梁减震技术研究[J].中国安全科学,2009,11(1):81-86.LI Chenggen,GAO Ri.Study on the shock absorbing technique of high speed railway bridges[J].China Safety Science Journal,2009,11(1):81-86.(in Chinese)
[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):71-80.WANG Junwen,LI Jianzhong,FAN Lichu.State of art of current studies on the effect of seismic induced pounding between adjacent bridge decks and falling-off prevention measures[J].Highway Traffic Science and Technology,2007,24(5):71-80.(in Chinese)
[8]冯亚成.高速铁路桥梁支座系统[J].世界桥梁,2011,150(2):15-17.FENG Yacheng.High speed railway bridge bearing system[J].World Bridges,2011,150(2):15-17.(in Chinese)
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