轻轨列车和地震作用下公轨两用桥的动力响应分析
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摘要
针对跨座式单轨列车过桥时行车的舒适性、安全性及桥梁结构完整性问题,本文以重庆菜园坝公轨两用桥为例,分析了轻轨列车和地震作用下公轨两用桥的动力响应,建立了桥梁结构的三维模型,并将轻轨列车荷载进行了适当的简化,通过特征值分析获得了桥梁结构的模态及频率,分别考虑了地震和移动荷载单独作用下桥梁结构的动力响应,并考虑了两种作用同时存在时桥梁结构的动力响应。分析结果表明,轻轨列车荷载对桥梁结构局部性能影响比较大;车速的提升对桥梁结构的振动影响并不显著;地震作用与移动荷载单独作用下引起桥梁结构的振动存在耦合。该研究对地震作用下公轨两用桥的运营安全及设计具有现实指导价值。
As we know,the problem that comfort and security of moving train and integrity of bridge structure can occur when Straddle-type Monorail Car cross bridge.As for this problem,Caiyuanba railwayhighway combined bridge will be taken as an example in this paper.Dynamic response of a railway-highway bridge under light rail train and earthquake action is studied.A 3-dimensional calculation model of the bridge structure is established.Load of light rail train is simplified appropriately.Vibration mode and frequency of the model are firstly obtained by modal analysis.And then dynamic response of bridge structure under earthquake action and moving load separately is studied.Finally,dynamic response of bridge structure under earthquake action and moving load together is analyzed.The result shows that light-rail train load has more influence on partial performance of bridge structure.Vibration of bridge structure is not obvious with the speed increasing.Vibration of bridge under earthquake excitation and train moving load is coupled.It can be seen that these conclusions have practical guide to the safe operation and design of railway-highway combined bridge under earthquake action.
As we know,the problem that comfort and security of moving train and integrity of bridge structure can occur when Straddle-type Monorail Car cross bridge.As for this problem,Caiyuanba railwayhighway combined bridge will be taken as an example in this paper.Dynamic response of a railway-highway bridge under light rail train and earthquake action is studied.A 3-dimensional calculation model of the bridge structure is established.Load of light rail train is simplified appropriately.Vibration mode and frequency of the model are firstly obtained by modal analysis.And then dynamic response of bridge structure under earthquake action and moving load separately is studied.Finally,dynamic response of bridge structure under earthquake action and moving load together is analyzed.The result shows that light-rail train load has more influence on partial performance of bridge structure.Vibration of bridge structure is not obvious with the speed increasing.Vibration of bridge under earthquake excitation and train moving load is coupled.It can be seen that these conclusions have practical guide to the safe operation and design of railway-highway combined bridge under earthquake action.
引文
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[2]刘春,刘长宏,宋俊杰.地震对桥梁的危害、抗震措施及结构振动控制[J].北方交通,2011(11):59-61.
[3]陈洁.简述桥梁结构抗震设计与设防措施[J].价值工程,2013(10):109-110.
[4]陈令坤,蒋丽忠.地震作用下高速铁路列车—无砟轨道—桥梁系统动力响应及列车走行安全研究[J].中国铁道科学,2013,34(1):131-133.
[5]张媛,董春敏,李静.车轨桥振动系统垂向模型和空间模型的比较[J].陕西理工学院学报(自然科学版),2010,26(3):46-51.
[6]雷虎军,李小珍.非一致地震激励下列车-轨道-桥梁耦合振动模型[J].西南交通大学学报,2013,48(5):803-809.
[7]夏禾,张楠.车辆与结构动力相互作用[M].北京:科学出版社,2002.
[8]刘安双,刘雪山,刘国祥,等.重庆菜园坝长江大桥结构细节设计[J].公路,2007(4):65-68.
[9]蔺鹏臻,刘世忠.桥梁结构有限元分析[M].北京:科学出版社,2008.
[10]王宁波,任伟新,肖祥.列车桥梁耦合振动研究综述[J].力学进展,2012,42(5):634-643.
[11]沈敏,林雪飞,刘多贵.基于Midas Civil的简易车桥耦合振动分析[J].西部交通科技,2012(8):68-71.
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