超大跨悬索桥地震响应的综合最优控制研究
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摘要
超大跨缆索支承桥梁通常选择隔震体系以减小桥塔的地震内力,但隔震体系会使得结构在强震下的梁端位移很大,必须采取控制措施以保证整体结构的抗震安全性。本文以主跨1 490 m的润扬悬索桥为研究对象,在对其地震响应特性进行分析的基础上,从振动控制的原理出发,探讨了控制超大跨悬索桥地震响应的具体的措施及参数选择,结合改进的层次分析法提出了地震响应综合最优控制的概念,构造了综合最优控制效果评估模型,并给出了该桥在给定地震输入下的综合最优控制措施。结果表明,对于超大跨悬索桥,在塔、梁间设置弹性连接装置或阻尼器都能减小梁端位移响应,但综合考虑其它部位的响应,阻尼器的减震效果更为全面。
In order to reduce the seismic force of the towers,the seismic isolation system is commonly adopted in super-long-span suspension bridges.But in this system,the seismic displacement at the end of the main girder may exceed the allowance,so suitable devices should be employed between the towers and the main girder to control the displacement.Based on the mechanism of vibration control,this paper investigated the selection of practical connection devices and the determination of their parameters,and the concept of compositive optimal control was proposed combined with modified AHP method.The Runyang Suspension Bridge with a main span of 1 490 m was taken as an example.After 3-dimensional nonlinear seismic analyses using different parameters of connection devices were carried out,the compositive optimal parameters of the connection devices were achieved.Results showed that both the elastic connection devices and the dampers with rational parameters could significantly reduce the seismic displacement of the bridge,but the dampers were better if all factors were considered.
In order to reduce the seismic force of the towers,the seismic isolation system is commonly adopted in super-long-span suspension bridges.But in this system,the seismic displacement at the end of the main girder may exceed the allowance,so suitable devices should be employed between the towers and the main girder to control the displacement.Based on the mechanism of vibration control,this paper investigated the selection of practical connection devices and the determination of their parameters,and the concept of compositive optimal control was proposed combined with modified AHP method.The Runyang Suspension Bridge with a main span of 1 490 m was taken as an example.After 3-dimensional nonlinear seismic analyses using different parameters of connection devices were carried out,the compositive optimal parameters of the connection devices were achieved.Results showed that both the elastic connection devices and the dampers with rational parameters could significantly reduce the seismic displacement of the bridge,but the dampers were better if all factors were considered.
引文
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[8]孙光亮.多层次综合评判模型及其应用[J].系统工程,1996,14(2):64-67.SUN G L.A Muti-hierarchical co-mprehensive evaluation sodel anditplication[J].System Engineering,1996,14(2):64-67.(inChinese)
[2]MURPHY,THOMAS P,COLLINS,et al.Retrofitting suspen-sion bridges using distributed dampers[J].Journal of StructuralEngineering,2004,130(10):1466-1474.
[3]FANG,You-liang.Active seismic response robustness control ofcable-stayed-suspension bridges[J].Process in Safety Science andTechnology Part A,2002(3):513-518.
[4]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN L C.Seismic analysis of bridge[M].Shanghai:Tongji Uni-versity Press,1997.(in Chinese)
[5]CHARLES SEIM P E.The seismic retrofit of the golden gatebridge[A].PRC-USWorkshop on seismic analysis and design ofspecial bridges,Shanghai,October 2002.
[6]叶爱君,胡世德,范立础.超大跨度斜拉桥的地震位移控制[J].土木工程学报,2004,37(12):38-43.YE A J,HU S D,FAN L C.Ssismic displacement control for su-per-long-span cable-stayed bridges[J].China Civil EngineeringJournal,2004,37(12),38-43.(in Chinese)
[7]叶正强,李爱群,程文氵襄,等.采用粘滞流体阻尼器的工程结构减振设计研究[J].建筑结构学报,2001,22(4):61-66.YE Z Q,LI A Q,CHENG W R,et al.Study on vibration energydissipation design of structures with fluid viscous damper[J].Journal of Building Structures,2001,22(4),61-66.(in Chi-nese)
[8]孙光亮.多层次综合评判模型及其应用[J].系统工程,1996,14(2):64-67.SUN G L.A Muti-hierarchical co-mprehensive evaluation sodel anditplication[J].System Engineering,1996,14(2):64-67.(inChinese)
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