地震海啸作用对近海深水桥梁结构动力响应的影响
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摘要
为确保跨海桥梁结构安全,需要进行地震响应分析。同时,由于地震可能引发海啸,有必要分析地震海啸作用对深水桥梁动力响应的影响。本文考虑地震海啸作用,同时采用辐射波浪理论考虑桥墩地震动水压力,对近海深水桥梁结构进行地震响应分析。研究表明:海啸作用增大了桥梁结构的动力响应,其影响随着海啸浪高的增加而增大;海啸浪高较大会导致桥梁结构发生损伤破坏直至丧失承载能力。综上所述,近海深水桥梁结构抗震设计应合理考虑地震海啸作用的影响。
It is need to analysis seismic responses of across-sea bridges to ensure safety of bridge structure. Meantime,it is necessary to study the influence of earthquake tsunami action on dynamic responses of bridges in deep water when tsunami is induced because of earthquake action.In this paper,the dynamic responses of offshore bridge in deep water are studied under tsunami action,and earthquake induced hydrodynamic pressure should also be considered based on radiation wave theory.The results indicated that:dynamic responses of bridge in deep water are augmented because of tsunami action,and the influence of tsunami action on seismic response of bridge in deep water is increased with the largen of tsunami wave height.Bridges in deep water will take serious damage and lost bearing capacity when tsunami wave height is more lager.In conclusion,the effect of earthquake tsunami action should be reasonable considered in seismic response analysis of offshore bridges in deep water.
It is need to analysis seismic responses of across-sea bridges to ensure safety of bridge structure. Meantime,it is necessary to study the influence of earthquake tsunami action on dynamic responses of bridges in deep water when tsunami is induced because of earthquake action.In this paper,the dynamic responses of offshore bridge in deep water are studied under tsunami action,and earthquake induced hydrodynamic pressure should also be considered based on radiation wave theory.The results indicated that:dynamic responses of bridge in deep water are augmented because of tsunami action,and the influence of tsunami action on seismic response of bridge in deep water is increased with the largen of tsunami wave height.Bridges in deep water will take serious damage and lost bearing capacity when tsunami wave height is more lager.In conclusion,the effect of earthquake tsunami action should be reasonable considered in seismic response analysis of offshore bridges in deep water.
引文
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[2]Deepankar C,Syed M A.Design of waterfront retaining wall for the passive case under earthquake and tsunami[J].Applied Ocean Research,2007,29(1-2):37-44
[3]Shoji G,Hiraki Y,Fujima K,et.al.Evaluation of tsunami fluid force acting on a bridge deck subjected to breaker bores[J].Procedia Engineering,2011,14:1079-1088
[4]John W L,Rakesh G,Rachel A G,et.al.Tsunami bore forces on a compliant residential building model[J].Engineering Structures, 2009,31(11):2534-2539
[5]Sakakibara S,Kudo M.Initial attack of large-scaled tsunami on ship motions and mooring loads[J].Ocean Engineering,2009,36 (2):145-157
[6]Silva R,Losada I J,Losada M A.Reflection and transmission of tsunami waves by coastal structures[J].Applied Ocean Research, 2000,22(4):215-223
[7]Frederic L,Franck L,Raphael P,et.al.A spatial analysis of the December 26th 2004 tsunami-induced damages:lessons learned for a better risk assessment integrating buildings vulnerability[J]. Applied Geography,2011,31(1):363-375
[8]温瑞智,公茂盛,谢礼力.海啸预警系统及我国海啸减灾任务[J].自然灾害学报,2006,15(3):1-7
[9]温燕玲,朱元清,宋治平等.冲绳海槽地震海啸的数值试验研究[J].地球物理学进展,2008,23(2):326-332
[10]Sun K,Nogami T.Earthquake induced hydrodynamic pressure on axisymmetric offshore structures[J].Earthquake Engineering and Structural Dynamics,1991,20(5):429-440
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