土层性质对入射平面SV波场地放大效应的影响研究
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摘要
采用直接刚度法,在频域内求解了层状弹性半空间中入射平面SV波的场地放大效应问题.将控制点选在假想基岩露头,通过集整土层及半空间的动力刚度矩阵,形成整个场地的动力刚度矩阵,利用场地离散动力平衡方程求解土层顶面位移幅值与控制点位移幅值的比值,即放大系数.分析了SV波入射时,土层性质对刚度增长场地中含刚性土层场地和含软弱土层场地放大效应的影响.
Amplification of incident SV waves in a layered elastic half-space is analyzed by using direct stiffness method in frequency domain.The location of the control point is chosen at an assumed rock outcrop.The dynamic-stiffness matrix of the total system is calculated by assembling the matrices of individual elements.The ratio of the absolute values of the displacement amplitudes at the top of the layer and at outcropping of the bedrock is computed by solving the discretized dynamic equilibrium equation of the site.The influence of properties of soil layer on the amplification effect for the incident SV waves of a site with increasing stiffness,site with stiffness layer and site with soft layer is analyzed.
Amplification of incident SV waves in a layered elastic half-space is analyzed by using direct stiffness method in frequency domain.The location of the control point is chosen at an assumed rock outcrop.The dynamic-stiffness matrix of the total system is calculated by assembling the matrices of individual elements.The ratio of the absolute values of the displacement amplitudes at the top of the layer and at outcropping of the bedrock is computed by solving the discretized dynamic equilibrium equation of the site.The influence of properties of soil layer on the amplification effect for the incident SV waves of a site with increasing stiffness,site with stiffness layer and site with soft layer is analyzed.
引文
[1]钱胜国.软土夹层地基场地土层地震反应特性研究[J].工程抗震,1994,(1):32-36.
[2]刘曾武.考虑软弱夹层的影响对设计反应谱修正的简易方法[A].第四届全国地震工程会议论文集(一)[C].哈尔滨:1994,86-91.
[3]Wolf J P.Dynamic Soil-structure Interaction[M].EnglewoodCliffs:Prentice-Hall,1985.
[4]Wolf J P and Obernhuber P.Free-field response from inclinedSV-and P-waves and Rayleigh waves[J].Earthquake eng.struct.dyn,1982,(10):847-869.
[5]Wolf J P and Obernhuber P.Free-field response from inclinedSH-waves and Love-waves[J].Earthquake eng.struct.dyn,1982,(10):823-845.
[2]刘曾武.考虑软弱夹层的影响对设计反应谱修正的简易方法[A].第四届全国地震工程会议论文集(一)[C].哈尔滨:1994,86-91.
[3]Wolf J P.Dynamic Soil-structure Interaction[M].EnglewoodCliffs:Prentice-Hall,1985.
[4]Wolf J P and Obernhuber P.Free-field response from inclinedSV-and P-waves and Rayleigh waves[J].Earthquake eng.struct.dyn,1982,(10):847-869.
[5]Wolf J P and Obernhuber P.Free-field response from inclinedSH-waves and Love-waves[J].Earthquake eng.struct.dyn,1982,(10):823-845.
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