深水桥梁群桩-桁架组合基础抗震性能分析
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摘要
研究了水下双桩系统按照同向、反向振型振动时的频率及动水压力变化规律,通过分析发现,水下相邻桩反向振动振型会增强作用于桩身的动水效应.据此提出群桩-桁架组合基础设计方案,通过桩间桁架限制群桩间反向振动提高基础刚度.以四桩群桩基础模型为试验对象,进行了普通群桩基础和3种组合基础方案在不同水深条件下的水池模态试验,研究了群桩-桁架组合基础的动力性能.然后通过对四跨连续梁桥进行地震反应谱分析,全面评估了该新型基础的抗震性能.研究表明,经过合理设计的群桩-桁架组合基础可以改善并优化深水桥梁的地震响应.
The frequencies and the modal hydrodynamic pressure of the parallel and nonparallel vibration modes for a submerged two-pile system are investigated first.The results show that the nonparallel vibration of the two-pile system increases the hydrodynamic effect.The pile grouptruss foundation is developed to control the nonparallel vibration of piles and increase the stiffness by installing the truss braces between piles.The modal tests for a typical group foundation and three developed pile group-truss foundation designs are carried out on a 4-pile foundation specimen to investigate the dynamic performances experimentally.The seismic performance of the pile grouptruss foundation is then assessed through seismic response spectrum analyses of a four span deep water bridge.The study shows that the properly designed pile group-truss foundation improves and optimizes the seismic responses of the deep water bridges.
The frequencies and the modal hydrodynamic pressure of the parallel and nonparallel vibration modes for a submerged two-pile system are investigated first.The results show that the nonparallel vibration of the two-pile system increases the hydrodynamic effect.The pile grouptruss foundation is developed to control the nonparallel vibration of piles and increase the stiffness by installing the truss braces between piles.The modal tests for a typical group foundation and three developed pile group-truss foundation designs are carried out on a 4-pile foundation specimen to investigate the dynamic performances experimentally.The seismic performance of the pile grouptruss foundation is then assessed through seismic response spectrum analyses of a four span deep water bridge.The study shows that the properly designed pile group-truss foundation improves and optimizes the seismic responses of the deep water bridges.
引文
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[2]赖伟,王君杰,韦晓,等.桥墩地震动水效应的水下振动台试验研究[J].地震工程与工程振动,2006,26(6):164.LAI Wei,WANG Junjie,WEI Xiao,et al.The shaking table test for submerged bridge pier[J].Earthquake Engineering and Engineering Vibration,2006,26(6):164.
[3]ZHANG G,SONG B,LIU H.Study of hydrodynamic pressure on the cylindrical pile-cap pier in deep water subjected to seismic action[M].[S.l.]:ICCTP,2009.
[4]WU J S,CHEN K W.An alternative approach to the structural motion analysis of wedge-beam offshore structures supporting a load[J].Ocean Engineering,2003,30(14):1791.
[5]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.HUANG Xin,LI Zhongxian.Influence of hydrodynamic pressure on seism ic response of bridge piers in deep water[J].China Civil Engineering Journal,2011,44(1):65.
[6]王君杰,赖伟,胡世德.深水高桩基础桥梁地震水动力效应分析[J].同济大学学报:自然科学版,2011,39(5):650.WANG Junjie,LAI Wei,HU Shide.Seismic hydrodynamic effects on group-pile foundations with caps merged in water[J].Journal of Tongji University:Natural Science,2011,39(5):650.
[7]Bouaanani N,Lu F Y.Assessment of potential-based fluid finite elements for seismic analysis of dam-reservoir systems[J].Computers&Structures,2009,87(3/4):206.
[8]Wei K,Yuan W,Bouaanani N.Experimental and numerical assessment of the three-dimensional modal dynamic response of bridge pile foundations submerged in water[J].Journal of Bridge Engineering,2012.
[9]Adina R D.ADINA theory and modeling guide[R].Watertoun:ADIND R&D,2010.
[10]Miquel B,Bouaanani N.Practical dynamic analysis of structures laterally vibrating in contact with water[J].Computers&Structures,2011,89(23/24):2195.
[11]杨飏,欧进萍.导管架式海洋平台磁流变阻尼隔震结构的模型试验[J].振动与冲击,2006,25(5):1.YANG Yang,OU Jinping.Experimental research on isolation structure model of jacket offshore platform with MR damper[J].Journal of Vibration and Shock,2006,25(5):1.
[12]魏凯,袁万城.深水高桩承台基础地震动水效应数值解析混合算法[J].同济大学学报:自然科学版,2013,41(3):336.WEI Kai,YUAN Wancheng.A numerical-analytical mixed method of hydrodynamic effect for deep-water elevated pile cap foundation under earthquake[J].Journal of Tongji University:Natural Science,2013,41(3):336.
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