行波效应对深水连续刚构桥地震响应的影响
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摘要
跨海或库区的大跨度桥梁在地震作用下不仅需要考虑水体与桥墩的动力相互作用,同时由于各桥墩间跨度较大应考虑地震输入的行波效应。该文采用辐射波浪理论求解桥墩地震动水压力,建立了考虑地震动输入空间效应的深水桥梁地震响应分析方法,并考虑行波效应对深水连续刚构桥进行地震响应分析。研究表明:动水压力增大了桥梁结构的地震响应,其影响程度随着输入地震波和墩梁约束条件的不同而有所差异;考虑行波效应时地震动水压力对桥梁结构动力响应的影响较一致激励而言有所差别,同时地震动水压力对桥梁地震响应的影响随着视波速的不同而变化。由此得出结论,为合理评价地震动水压力对深水长大桥梁动力响应的影响应考虑地震动输入的行波效应。
Water-bridge-pier dynamic interactions should be considered in the earthquake response analysis of bridges located in the sea or reservoir area,and the traveling wave effect also cannot be ignored for long-span bridge structures.The hydrodynamic pressure formulary of bridge piers is solved using radiation wave theory,and a seismic response analysis method of bridges in deep water is established,which can consider the spatial effect of a ground motion input.The earthquake response analysis about a continuous rigid-framed bridge is made,considering the traveling wave effect.The results indicate that: dynamic responses of a bridge in deep water is augmented because of hydrodynamic pressure action,and the influence of hydrodynamic pressure on seismic responses of a bridge in deep water is changed with different earthquake wave excitations and constraint conditions about a pier-box girder.The effect of hydrodynamic pressure on the earthquake response of a bridge in deep water is different,considering traveling waves relative to a uniform excitation,which is also changed with apparent wave velocity when the traveling wave effect is considered.In conclusion,the traveling wave effect should be considered in seismic response analyses of long and huge bridges in deep water under hydrodynamic pressure actions.
Water-bridge-pier dynamic interactions should be considered in the earthquake response analysis of bridges located in the sea or reservoir area,and the traveling wave effect also cannot be ignored for long-span bridge structures.The hydrodynamic pressure formulary of bridge piers is solved using radiation wave theory,and a seismic response analysis method of bridges in deep water is established,which can consider the spatial effect of a ground motion input.The earthquake response analysis about a continuous rigid-framed bridge is made,considering the traveling wave effect.The results indicate that: dynamic responses of a bridge in deep water is augmented because of hydrodynamic pressure action,and the influence of hydrodynamic pressure on seismic responses of a bridge in deep water is changed with different earthquake wave excitations and constraint conditions about a pier-box girder.The effect of hydrodynamic pressure on the earthquake response of a bridge in deep water is different,considering traveling waves relative to a uniform excitation,which is also changed with apparent wave velocity when the traveling wave effect is considered.In conclusion,the traveling wave effect should be considered in seismic response analyses of long and huge bridges in deep water under hydrodynamic pressure actions.
引文
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[11]刘振宇,李乔,赵灿晖,等.深水连续刚构桥地震响应分析[J].地震工程与工程振动,2009,29(4):119―124.Liu Zhengyu,Li Qiao,Zhao Canhui,et al.Analysis ofseismic responses of continuous rigid-frame bridge indeep water[J].Earthquake Engineering and EngineeringVibration,2009,29(4):119―124.(in Chinese)
[12]张国明,宋波.动水压力对深水桥梁性能设计的影响[J].北京科技大学学报,2009,31(9):1086―1094.Zhang Guoming,Song Bo.Effect of hydrodynamicpressure on performance-based design of a deepwaterbridge[J].Journal of University of Science andTechnology Beijing,2009,31(9):1086―1094.(inChinese)
[2]Dumanogluid A A,Soyluk K.A stochastic analysis oflong span structures subjected to spatially varying groundmotions including the site-response effect[J].Engineering Structures,2003,25(10):1301―1310.
[3]Lou L,Zerva A.Effects of spatially variable groundmotions on the seismic response of a skewed,multi-span,RC highway bridge[J].Soil Dynamics and EarthquakeEngineering,2005,25(7/8/9/10):729―740.
[4]Dameron R A,Sobash V P,Lam I P.Nonlinear seismicanalysis of bridge structures foundation-soilrepresentation and ground motion input[J].Computersand Structures,1997,64(5/6):1251―1269.
[5]Sun K,Nogami T.Earthquake induced hydrodynamicpressure on axisymmetric offshore structures[J].Earthquake Engineering and Structural Dynamics,1991,20(5):429―440.
[6]Aviles J,Li X Y.Hydrodynamic pressures onaxisymmetric offshore structures considering seabedflexibility[J].Computers and Structures,2001,79(29/30):2595―2606.
[7]Bhatta D D,Rahman M.On scattering and radiationproblem for a cylinder in water of finite depth[J].International Journal of Engineering Science,2003,41(9):931―967.
[8]Han R P S,Xu H Z.A simple and accurate added massmodel for hydrodynamic fluid-structure interactionanalysis[J].International Journal of Engineering Science,1996,333(6):929―945.
[9]黄信,李忠献.自由表面波和水体压缩性对深水桥墩地震动水压力的影响[J].天津大学学报,2011,44(4):319―323.Huang Xin,Li Zhongxian.Influence of free surface waveand water compressibility on earthquake inducedhydrodynamic pressure[J].Journal of Tianjin University2011,44(4):319―323.(in Chinese)
[10]黄信,李忠献.动水压力作用对深水桥墩地震响应的影响[J].土木工程学报,2011,44(1):65―73.Huang Xin,Li Zhongxian.Influence of hydrodynamicpressure on seismic responses of bridge piers in deepwater[J].China Civil Engineering Journal,2011,44(1):65―73.(in Chinese)
[11]刘振宇,李乔,赵灿晖,等.深水连续刚构桥地震响应分析[J].地震工程与工程振动,2009,29(4):119―124.Liu Zhengyu,Li Qiao,Zhao Canhui,et al.Analysis ofseismic responses of continuous rigid-frame bridge indeep water[J].Earthquake Engineering and EngineeringVibration,2009,29(4):119―124.(in Chinese)
[12]张国明,宋波.动水压力对深水桥梁性能设计的影响[J].北京科技大学学报,2009,31(9):1086―1094.Zhang Guoming,Song Bo.Effect of hydrodynamicpressure on performance-based design of a deepwaterbridge[J].Journal of University of Science andTechnology Beijing,2009,31(9):1086―1094.(inChinese)
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