坝体—库水—淤积层—地基系统地震动分析
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摘要
为明确地震中坝体—库水—淤积层—地基系统相互作用下坝体的反应,将泥沙淤积层作为粘性、可压缩及大密度流体,考虑柔性地基作用建立了二维计算模型。本模型计算结果与以往报道结果相一致:柔性地基与淤积层都能够降低库坝系统的共振频率及反应幅值。此外,本文提出的方法简单、编程方便及运算速度快等特点可以较方便地应用到混凝土坝体非线性动力响应计算中。
In order to find out the response of dam body under the interaction of a dam-reservoir-sediment deposit-foundation interaction system during earthquake,a 2-D calculation model is established under the consideration of the effect of flexible foundation by taking sediment deposit as a viscous and compressible fluid with large density. The result of the model calculation made herein accords with those from the previous reports,i. e. both the flexible foundation and the sediment deposit can lower the resonance frequency and response amplitude of a reservoir-dam system. Moreover,the method given herein is simple with the features of convenient programming and quick calculation,and then can be conveniently applied to the calculation of the nonlinear dynamic response of concrete dam body.
In order to find out the response of dam body under the interaction of a dam-reservoir-sediment deposit-foundation interaction system during earthquake,a 2-D calculation model is established under the consideration of the effect of flexible foundation by taking sediment deposit as a viscous and compressible fluid with large density. The result of the model calculation made herein accords with those from the previous reports,i. e. both the flexible foundation and the sediment deposit can lower the resonance frequency and response amplitude of a reservoir-dam system. Moreover,the method given herein is simple with the features of convenient programming and quick calculation,and then can be conveniently applied to the calculation of the nonlinear dynamic response of concrete dam body.
引文
[1]Chopra A K.Hydrodynamic pressures on dams during earthquake[J].Journal of Engineering Mechanics,ASCE,1967,93(ME6):205-233.
[2]Chwang A T,Housner G W.Hydrodynamic pressures on sloping dams during earthquake,part 1:Momentum method[J].Journal of Fluid Mechanics,1978,87(2):335-341.
[3]Chakrabarti P,Chopra A K.Hydrodynamic pressures and response of gravity dams to vertical earthquake component[J].Earthquake Engineering and Structural Dynamics,1972,1(4):325-335.
[4]Chakrabarti P,Chopra A K.Earthquake analysis of gravity dams including hydrodynamic interaction[J].Earthquake Engineering and Structural Dynamics,1973:2(2):143-160.
[5]烟野正.塚原重力ダムの振动实验とその考察[C]//土木学会论文集.1958,59:8-16.
[6]烟野正.水の弹性によゐ震动水压力の共振に关すゐ吟味[C]//土木学会论文集.1966,129:1-5.
[7]Hall J F,Chopra A K.Two-dimensional dynamic analysis of concrete gravity and embankment dams including hydrodynamic effects[J].Earthquake Engineering and Structural Dynamics,1982,10(2):305-332.
[8]Fenves G,Chopra A K.Earthquake analysis of concrete gravity dams including reservoir bottom absorption and dam-water-foundation rock interaction[J].Earthquake Engineering and Structural Dynamics,1984,12(5):663-680.
[9]Medina F,Dominguez J,Tassoulas J L.Response of dams to earthquakes including effects of sediments[J].Journal of Structural Engineering,ASCE,1990,116(1):3108-3121.
[10]Dominguez J,Gallego R,and Japon B R.Effects of porous sediments on seismic response of concrete gravity dams[J].Journal of engineering mechanics,1997,123(4):302-311.
[11]王进廷,杜修力,张楚汉.重力坝—库水—淤砂—地基系统动力分析的时域显式有限元模型[J].清华大学学报(自然科学版),2003,43(8):1112-1115.
[12]牛志伟,李同春,赵兰浩.库底淤沙对混凝土重力坝地震响应的影响[J].水力发电学报,2009 28(5):187-190.
[13]冯利.淤沙在坝—库水—地基系统动力时程响应中的影响研究[J].水利科技与经济,2009,15(10):870-872.
[14]百色东笋造纸厂,广西林科所.消除造纸黑液污染的新途径:常压法用造纸黑液制甲硫醚、甲硫醇和石油钻井泥浆降粘剂扩大试验报告[J].广西林业科学,1977(z1):11-34.
[15]饶黄云,刘悦.用自制仪器精确测定变温液体的粘滞系数[J].实验力学,2008,23(2):186-194.
[2]Chwang A T,Housner G W.Hydrodynamic pressures on sloping dams during earthquake,part 1:Momentum method[J].Journal of Fluid Mechanics,1978,87(2):335-341.
[3]Chakrabarti P,Chopra A K.Hydrodynamic pressures and response of gravity dams to vertical earthquake component[J].Earthquake Engineering and Structural Dynamics,1972,1(4):325-335.
[4]Chakrabarti P,Chopra A K.Earthquake analysis of gravity dams including hydrodynamic interaction[J].Earthquake Engineering and Structural Dynamics,1973:2(2):143-160.
[5]烟野正.塚原重力ダムの振动实验とその考察[C]//土木学会论文集.1958,59:8-16.
[6]烟野正.水の弹性によゐ震动水压力の共振に关すゐ吟味[C]//土木学会论文集.1966,129:1-5.
[7]Hall J F,Chopra A K.Two-dimensional dynamic analysis of concrete gravity and embankment dams including hydrodynamic effects[J].Earthquake Engineering and Structural Dynamics,1982,10(2):305-332.
[8]Fenves G,Chopra A K.Earthquake analysis of concrete gravity dams including reservoir bottom absorption and dam-water-foundation rock interaction[J].Earthquake Engineering and Structural Dynamics,1984,12(5):663-680.
[9]Medina F,Dominguez J,Tassoulas J L.Response of dams to earthquakes including effects of sediments[J].Journal of Structural Engineering,ASCE,1990,116(1):3108-3121.
[10]Dominguez J,Gallego R,and Japon B R.Effects of porous sediments on seismic response of concrete gravity dams[J].Journal of engineering mechanics,1997,123(4):302-311.
[11]王进廷,杜修力,张楚汉.重力坝—库水—淤砂—地基系统动力分析的时域显式有限元模型[J].清华大学学报(自然科学版),2003,43(8):1112-1115.
[12]牛志伟,李同春,赵兰浩.库底淤沙对混凝土重力坝地震响应的影响[J].水力发电学报,2009 28(5):187-190.
[13]冯利.淤沙在坝—库水—地基系统动力时程响应中的影响研究[J].水利科技与经济,2009,15(10):870-872.
[14]百色东笋造纸厂,广西林科所.消除造纸黑液污染的新途径:常压法用造纸黑液制甲硫醚、甲硫醇和石油钻井泥浆降粘剂扩大试验报告[J].广西林业科学,1977(z1):11-34.
[15]饶黄云,刘悦.用自制仪器精确测定变温液体的粘滞系数[J].实验力学,2008,23(2):186-194.
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