地震作用下大型桥梁群桩基础动水压力效应分析
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摘要
以某长江公路大桥大型群桩基础为研究对象,以ABAQUS有限元软件为计算平台,采用整体有限元法对桥梁群桩基础的地震反应进行了数值模拟计算,选取三条傅氏谱频谱特征明显不同的地震波,考虑了土体和混凝土的非线性特征,分析了深厚场地上大型桥梁群桩基础的动水压力效应。结果表明:动水压力效应改变了桥梁群桩基础的地震反应特性,对桩身的加速度、位移和内力反应有不同程度的影响。对于大型桥梁基础抗震计算,分析群桩基础动水压力效应的影响更符合工程实际。
Taking the large group piles foundation of the Changjiang River Road Bridge as a research project,and computing on ABAQUS finite element software,and using the added water mass method to consider the effects of hydrodynamic pressure,the seismic response of the bridge group-piles was calculated numerically by the whole finite-element method,three earthquake waves with different spectra was selected,dynamic nonlinear characteristics of soils and concrete was considered,and the hydrodynamic pressure effect of the large group piles foundation for bridge on deep overburden layers was analyzed.The results showed that hydrodynamic pressure effect changed the seismic responses characters of the group piles foundation,which had the impact on the acceleration,displacement and inner force of the pile.It complies much more with the actual situation considering the hydrodynamic pressure effect in the seismic design of a large bridge foundation.
Taking the large group piles foundation of the Changjiang River Road Bridge as a research project,and computing on ABAQUS finite element software,and using the added water mass method to consider the effects of hydrodynamic pressure,the seismic response of the bridge group-piles was calculated numerically by the whole finite-element method,three earthquake waves with different spectra was selected,dynamic nonlinear characteristics of soils and concrete was considered,and the hydrodynamic pressure effect of the large group piles foundation for bridge on deep overburden layers was analyzed.The results showed that hydrodynamic pressure effect changed the seismic responses characters of the group piles foundation,which had the impact on the acceleration,displacement and inner force of the pile.It complies much more with the actual situation considering the hydrodynamic pressure effect in the seismic design of a large bridge foundation.
引文
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[5]李富荣,陈国兴,王志华.考虑动水压力影响的单柱式桥墩地震反应分析[J].地震工程与工程振动,2008,28(2):114-121.LI Furong,CHEN Guoxing,WANG Zhihua.Seismic re-sponses of single-column pier considering the effects ofhydrodynamic pressure[J].Journal of Earthquake Engi-neering and Engineering Vibration,2008,28(2):114-121.
[6]MORISONG J R,O′BRIEN M P,JOHNSON J W,etal.The force exerted to surface wave on piles[J].Petro-leum Transaction,AIME,1950(189):149-154.
[7]陈国兴,庄海洋.基于Davidenkov骨架曲线的土体本构关系及其参数研究[J].岩土工程学报,2005,27(8):860-864.CHEN Guoxing,ZHUANG Haiyang.Developed nonlin-ear dynamic constitutive relations of soils based on davi-denkov skeleton curve[J].Journal Geotechnical Engi-neering,2005,27(8):860-864.
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[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.CHEN Guoxing.Geotechnical earthquake engineering[M].Beijing:Science Press,2007.
[3]沈婷,李国英,章为民.超深桩基础的有效应力地震反应有限元分析[J].岩土力学,2004,25(7):1045-1049.SHEN Ting,LI Guoying,ZHANG Weimin.Effectivestress finite element analysis for seismic response of deeppile foundation[J].Rock and Soil Mechanics,2004,25(7):1045-1049.
[4]虞庐松,严松宏,陈兴冲,等.多年冻土区桩基础桥墩随机地震反应分析[J].世界地震工程,2007,23(1):12-16.YU Lusong,YAN Songhong,CHEN Xingchong,et al.Stochastic earthquake response analysis of bridge pierswith pile foundation in the permafrost regions[J].WorldEarthquake Engineering,2007,23(1):12-16.
[5]李富荣,陈国兴,王志华.考虑动水压力影响的单柱式桥墩地震反应分析[J].地震工程与工程振动,2008,28(2):114-121.LI Furong,CHEN Guoxing,WANG Zhihua.Seismic re-sponses of single-column pier considering the effects ofhydrodynamic pressure[J].Journal of Earthquake Engi-neering and Engineering Vibration,2008,28(2):114-121.
[6]MORISONG J R,O′BRIEN M P,JOHNSON J W,etal.The force exerted to surface wave on piles[J].Petro-leum Transaction,AIME,1950(189):149-154.
[7]陈国兴,庄海洋.基于Davidenkov骨架曲线的土体本构关系及其参数研究[J].岩土工程学报,2005,27(8):860-864.CHEN Guoxing,ZHUANG Haiyang.Developed nonlin-ear dynamic constitutive relations of soils based on davi-denkov skeleton curve[J].Journal Geotechnical Engi-neering,2005,27(8):860-864.
[8]LEE J,FENVES G L.Plastic-damage model for cyclicloading of concrete structures[J].Journal of EngineeringMechanics,1998(4):892-900.
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