考虑水底柔性反射边界的深水桥墩地震动水压力分析
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摘要
在深水桥墩地震动水压力分析中一般假定水底为完全反射边界,而忽略水底柔性介质对动水压力波的吸收作用。该文考虑水底柔性反射边界,基于辐射波浪理论,建立了深水桥墩地震动水压力的计算公式,深入分析了水底柔性反射边界对动水压力的影响。研究表明:水底柔性反射边界会在特定的荷载激励频率范围内对深水桥墩动水压力产生影响,且动水压力随水底反射系数的减小而减小,深水桥墩地震动水压力分析可以忽略水底柔性边界的影响。从而为长大桥梁地震灾变过程精细化模拟提供了理论依据。
The earthquake induced hydrodynamic pressure analysis of a bridge pier in deep water is based on a rigid reflection boundary of bottom,and the absorption action about flexible medium of bottom on hydrodynamic pressure wave is ignored.Earthquake induced hydrodynamic pressure formulary is established in this paper using radiation wave theory,which can consider the flexible reflection boundary of bottom.The influence of the flexible reflection boundary on hydrodynamic pressure of a bridge pier is analyzed.The results indicate that: the hydrodynamic pressure of a bridge pier will be changed in a special load excitation frequency scope when the flexible reflection boundary of bottom is considered,and the hydrodynamic pressure of a bridge pier will be decreased with the reduction of reflection coefficients.The influence of the flexible reflection boundary on earthquake induced hydrodynamic pressure of a bridge pier can be ignored.The present research provides a theoretical basis for the earthquake hazard refined simulation of a long and huge bridge.
The earthquake induced hydrodynamic pressure analysis of a bridge pier in deep water is based on a rigid reflection boundary of bottom,and the absorption action about flexible medium of bottom on hydrodynamic pressure wave is ignored.Earthquake induced hydrodynamic pressure formulary is established in this paper using radiation wave theory,which can consider the flexible reflection boundary of bottom.The influence of the flexible reflection boundary on hydrodynamic pressure of a bridge pier is analyzed.The results indicate that: the hydrodynamic pressure of a bridge pier will be changed in a special load excitation frequency scope when the flexible reflection boundary of bottom is considered,and the hydrodynamic pressure of a bridge pier will be decreased with the reduction of reflection coefficients.The influence of the flexible reflection boundary on earthquake induced hydrodynamic pressure of a bridge pier can be ignored.The present research provides a theoretical basis for the earthquake hazard refined simulation of a long and huge bridge.
引文
[1]Goyal A,Chopra A K.Earthquake analysis ofintake-outlet towers including tower-water-foundation-soil interaction[J].Earthquake Engineering andStructural Dynamics,1989,18(3):325―344.
[2]Sun K,Nogami T.Earthquake induced hydrodynamicpressure axisymmetric offshore structures[J].Earthquake Engineering and Structural Dynamics,1991,20(5):429―440.
[3]赖伟.地震和波浪作用下深水桥梁的动力响应研究[D].上海:同济大学,2004.Lai Wei.Dynamic response study of bridge in deepwater under earthquake and wave action[D].Shanghai:Tongji University,2004.(in Chinese)
[4]刘振宇,李乔,赵灿晖,等.深水矩形空心桥墩在地震作用下附加动水压力分析[J].振动与冲击,2008,27(2):53―56.Liu Zhenyu,Li Qiao,Zhao Canhui,et al.Additionalhydrodynamic pressure analysis of hollow rectangularbridge pier in deep water under earthquake action[J].Journal of Vibration and Shock,2008,27(2):53―56.(inChinese)
[5]Fenves G,Chopra A K.Earthquake analysis of concretegravity dams including reservoir bottom absorption anddam-water-foundation rock interaction[J].EarthquakeEngineering and Structural Dynamics,1984,12(5):663―680.
[6]Fenves G,Chopra A K.Effects of reservoir bottomabsorption and dam-water-foundation rock interaction onfrequency response functions for concrete gravity dams[J].Earthquake Engineering and Structural Dynamics,1985,13(1):13―31.
[7]Fok K-L,Chopra A K.Earthquake analysis of arch damsincluding dam-water interaction,reservoir boundaryabsorption and foundation flexibility[J].EarthquakeEngineering and Structural Dynamics,1986,14(2):155―184.
[8]Medina F,Domingues J,Tassoulas J L.Response ofdams to earthquake including effects of sediments[J].Journal of Structural Engineering,1990,116(11):3108―3121.
[9]Chandrashaker R,Humar J L.Fluid-foundationinteraction in the seismic response of gravity dams[J].Earthquake Engineering and Structural Dynamics,1993,22(12):1067―1084.
[10]Aviles J,Li X Y.Hydrodynamic pressures onaxisymmetric offshore structures considering seabedflexibility[J].Computers and Structures,2001,79(29/30):2595―2606.
[11]Chen B F,Huang C F.Hydrodynamic forces on concretesea wall and breakwater during earthquake:effects ofbottom sediment layers and back-fill soil[J].OceanEngineering,2002,29(7):783―814.
[12]阎承大,张楚汉.拱坝地震动水压力分析的配点法[J].地震工程与工程振动,1990,10(4):73―82.Yan Chengda,Zhang Chuhan.A collocation method fordynamic water pressure calculation of arch dams[J].Earthquake Engineering and Engineering Vibration,1990,10(4):73―82.(in Chinese)
[13]於三大,熊文林,王鸿儒.库底淤砂对地震动水压力的影响[J].武汉水利电力学院学报,1992,25(5):487―493.Yu Sanda,Xiong Wenlin,Wang Hongru.Effect ofreservoir sedimentation on earthquake-induced dynamicwater pressure[J].Journal of Wuhan University ofHydraulic and Electric Engineering,1992,25(5):487―493.(in Chinese)
[14]王忠,晏启祥,刘浩吾.库底反射性边界条件与地震动水压力分析[J].四川大学学报(工程科学版),2003,34(1):36―39.Wang Zhong,Yan Qixiang,Liu Haowu.Reflectionalboundary condition on reservoir bottom and analysis ofhydrodynamics[J].Journal of Sichuan University(Engineering Science Edition),2003,34(1):36―39.(inChinese)
[15]王进廷,杜修力,张楚汉.淤积泥砂对水平地运动作用时刚性坝面动压力的影响[J].地震工程与工程振动,2002,22(5):8―13.Wang Jinting,Du Xiuli,Zhang Chuhan.Effects ofsediment on dynamic pressures acting on rigid dam dueto horizontal ground motion[J].Earthquake Engineeringand Engineering Vibration,2002,22(5):8―13.(inChinese)
[2]Sun K,Nogami T.Earthquake induced hydrodynamicpressure axisymmetric offshore structures[J].Earthquake Engineering and Structural Dynamics,1991,20(5):429―440.
[3]赖伟.地震和波浪作用下深水桥梁的动力响应研究[D].上海:同济大学,2004.Lai Wei.Dynamic response study of bridge in deepwater under earthquake and wave action[D].Shanghai:Tongji University,2004.(in Chinese)
[4]刘振宇,李乔,赵灿晖,等.深水矩形空心桥墩在地震作用下附加动水压力分析[J].振动与冲击,2008,27(2):53―56.Liu Zhenyu,Li Qiao,Zhao Canhui,et al.Additionalhydrodynamic pressure analysis of hollow rectangularbridge pier in deep water under earthquake action[J].Journal of Vibration and Shock,2008,27(2):53―56.(inChinese)
[5]Fenves G,Chopra A K.Earthquake analysis of concretegravity dams including reservoir bottom absorption anddam-water-foundation rock interaction[J].EarthquakeEngineering and Structural Dynamics,1984,12(5):663―680.
[6]Fenves G,Chopra A K.Effects of reservoir bottomabsorption and dam-water-foundation rock interaction onfrequency response functions for concrete gravity dams[J].Earthquake Engineering and Structural Dynamics,1985,13(1):13―31.
[7]Fok K-L,Chopra A K.Earthquake analysis of arch damsincluding dam-water interaction,reservoir boundaryabsorption and foundation flexibility[J].EarthquakeEngineering and Structural Dynamics,1986,14(2):155―184.
[8]Medina F,Domingues J,Tassoulas J L.Response ofdams to earthquake including effects of sediments[J].Journal of Structural Engineering,1990,116(11):3108―3121.
[9]Chandrashaker R,Humar J L.Fluid-foundationinteraction in the seismic response of gravity dams[J].Earthquake Engineering and Structural Dynamics,1993,22(12):1067―1084.
[10]Aviles J,Li X Y.Hydrodynamic pressures onaxisymmetric offshore structures considering seabedflexibility[J].Computers and Structures,2001,79(29/30):2595―2606.
[11]Chen B F,Huang C F.Hydrodynamic forces on concretesea wall and breakwater during earthquake:effects ofbottom sediment layers and back-fill soil[J].OceanEngineering,2002,29(7):783―814.
[12]阎承大,张楚汉.拱坝地震动水压力分析的配点法[J].地震工程与工程振动,1990,10(4):73―82.Yan Chengda,Zhang Chuhan.A collocation method fordynamic water pressure calculation of arch dams[J].Earthquake Engineering and Engineering Vibration,1990,10(4):73―82.(in Chinese)
[13]於三大,熊文林,王鸿儒.库底淤砂对地震动水压力的影响[J].武汉水利电力学院学报,1992,25(5):487―493.Yu Sanda,Xiong Wenlin,Wang Hongru.Effect ofreservoir sedimentation on earthquake-induced dynamicwater pressure[J].Journal of Wuhan University ofHydraulic and Electric Engineering,1992,25(5):487―493.(in Chinese)
[14]王忠,晏启祥,刘浩吾.库底反射性边界条件与地震动水压力分析[J].四川大学学报(工程科学版),2003,34(1):36―39.Wang Zhong,Yan Qixiang,Liu Haowu.Reflectionalboundary condition on reservoir bottom and analysis ofhydrodynamics[J].Journal of Sichuan University(Engineering Science Edition),2003,34(1):36―39.(inChinese)
[15]王进廷,杜修力,张楚汉.淤积泥砂对水平地运动作用时刚性坝面动压力的影响[J].地震工程与工程振动,2002,22(5):8―13.Wang Jinting,Du Xiuli,Zhang Chuhan.Effects ofsediment on dynamic pressures acting on rigid dam dueto horizontal ground motion[J].Earthquake Engineeringand Engineering Vibration,2002,22(5):8―13.(inChinese)
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