大跨径悬索桥液体黏滞阻尼器参数敏感性研究
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摘要
为研究液体黏滞阻尼器参数变化对大跨径悬索桥地震响应的控制效果,以某悬索桥为例,基于ANSYS有限元软件建立梁端设置液体黏滞阻尼器的结构有限元分析模型,采用非线性动力时程方法,对液体黏滞阻尼器的阻尼系数和阻尼指数进行参数敏感性分析,并与未设置液体黏滞阻尼器的结构地震响应进行对比,在此基础上研究液体黏滞阻尼器参数变化对结构地震响应的影响。结果表明:对于大跨度悬索桥,液体黏滞阻尼器的设置应以控制地震作用下梁端位移响应为首要目标,阻尼指数对减震效果影响最为显著,其值宜选取在0.8～1.0范围,并根据设计阻尼力来选择适当的阻尼系数值。设置恰当参数的液体黏滞阻尼器,可有效降低悬索桥梁端位移,且不会显著增加结构地震内力响应。
Based on nonlinear dynamic time history method,the effect of variation of fluid viscous damper's parameters on seismic response of long suspension bridge is studied in this paper.A long span suspension bridge is taken as an example,and the FEA(Finite Element Analysis) model of the bridge is established by considering the effect of fluid viscous damper by ANSYS.Parametric sensitivity study on damping coefficient and damping exponent is carried out.Compared with the seismic response of the bridge without using the damper,the effect of fluid viscous damper on the seismic response of the bridge is studied.The results show that,for long span suspension bridge,the primary objective of the fluid viscous damper is to reduce the beam displacement under earthquake.And the damping exponent plays a dominant role and should be set from 0.8 to 1.0,while the damping coefficient is defined by design force and the damping exponent of fluid viscous damper.By setting fluid viscous dampers in longitudinal direction of suspension bridge with suitable damping parameters,the beam displacement can be reduced effectively and little additional seismic force is introduced in the bridge.
Based on nonlinear dynamic time history method,the effect of variation of fluid viscous damper's parameters on seismic response of long suspension bridge is studied in this paper.A long span suspension bridge is taken as an example,and the FEA(Finite Element Analysis) model of the bridge is established by considering the effect of fluid viscous damper by ANSYS.Parametric sensitivity study on damping coefficient and damping exponent is carried out.Compared with the seismic response of the bridge without using the damper,the effect of fluid viscous damper on the seismic response of the bridge is studied.The results show that,for long span suspension bridge,the primary objective of the fluid viscous damper is to reduce the beam displacement under earthquake.And the damping exponent plays a dominant role and should be set from 0.8 to 1.0,while the damping coefficient is defined by design force and the damping exponent of fluid viscous damper.By setting fluid viscous dampers in longitudinal direction of suspension bridge with suitable damping parameters,the beam displacement can be reduced effectively and little additional seismic force is introduced in the bridge.
引文
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[2]江辉,朱熹.近断层地震动考虑能量损伤效应的非弹性强度需求[J].中国安全科学学报,2005,15(5):8-12.JIANG Hui,ZHU Xi.Inelastic strength demand of near-fault ground motions considering energy damage effect[J].ChinaSafety Science Journal,2005,15(5):8-12.
[3]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006:16.XIE Xu.Seismic Response and Earthquake Resistant Design of Bridges[M].Beijing:China Communications Press,2006:16.
[4]卢桂臣,胡雷挺.西堠门大桥液体粘滞阻尼器参数分析[J].世界桥梁,2005,38(2):43-45.LU Gui-chen,HU Lei-ting.Analysis of parametric sensitivity of fluid viscous dampers for Xihoumen bridge[J].WorldBridge,2005,38(2):43-45.
[5]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37-42.WANG Zhi-qiang,HU Shi-de,FAN Li-chu.Research on viscous damper parameters of Donghai Bridge[J].China Journalof Highway and Transport.2005,18(3):37-42.
[6]Lee D,Taylor D P.Viscous damper development and future trends[J].Structural Design of Tall Buildings,2001,10(5):311-320.
[7]聂利英,李建中,胡世德.任意荷载作用下液体粘滞阻尼器在桥梁工程中减震作用探讨[J].计算力学学报,2007,24(2):197-202.NIE Li-ying,LI Jian-zhong,HU Shi-de.Investigation of decreasing vibration effects of fluid viscous damper in bridgeengineering under random loads[J].Chinese Journal of Computational Mechanics,2007,24(2):197-202.
[8]Liu Wei,Tong Mai,George C.Optimization methodology for damper configuration based on building performanceindices[J].Journal Structure of Engineering,2005,131(11):1 746-1 756.
[9]Pekcan G,Mander JB,Chen SS.Fundamental consideration for the design of nonlinear viscous dampers[J].EarthquakeEngineering and Structural Dynamics,1999,28(11):1 405-1 425.
[10]Lin WH,Chopra Anil K.Earthquake response of elastic SDOF system with nonlinear fluid viscous dampers[J].Earth-quake Engineering and Structural Dynamics,2002,31(9):1623-1642.
[11]Martinez-Rodrigo M,Romero M L.An optimum retrofit strategy for moment resisting frames with nonlinear viscous damp-ers for seismic applications[J].Engineering Structure,2003,25(7):913-925.
[12]Miranda E,Bertero V.Evaluation of strength reduction factors for earthquake resistant design[J].Earthquake Spectra,1994,10(2):357-379.
[13]张立明.ALgor、Ansys在桥梁工程中的应用方法与实例[M].北京:人民交通出版社,2003.7:36-42.ZHANG Li-ming.Application Methods and Examples of Algor and Ansys in Bridge Engeering[M].Beijing:ChinaCommunications Press,2003.7:36-42.
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