土层刚度排序对平面P波场地放大效应的影响
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摘要
利用土层和半空间的精确动力刚度矩阵,在频域内求解并分析了弹性半空间场地对P波的放大效应.通过将各土层的动力刚度矩阵集整,形成整个场地的动力刚度矩阵.文中控制点选在假想基岩露头,通过直接刚度法求解表面位移与控制点位移的比值,即放大系数.探讨土层不同的刚度排序对平面P波场地放大效应的影响.
Amplification of P waves by flexible space is analyzed by exact dynamic-stiffness matrix of soil and half-space in frequency domain.The dynamic-stiffness matrix of the total system is calculated by assembling the matrices of individual elements.The location of the control point is chosen at an assumed rock outcrop,and using direct stiffness method to compute the ratios of the displacement amplitude absolute values of the top of the ground to the ones of rock outcrop,that is amplifications.Thus,on the effect of amplification of planar P waves by different order of soil stiffness can be gained.
引文
[1]刘洪兵.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-25.
    [2]刘殿魁,许贻燕.各向异性介质中SH波与多个半圆形凹陷地形的相互作用[J].力学学报,1993,25(1):93-102.
    [3]梁建文,张郁上.圆弧形层状河谷场地对平面SH波入射下的动力响应分析[J].岩土工程学报,2000,22(4):388-393.
    [4]Wolf JP.Dynamic Soil-Structure Interaction[M].New York:Prentice-Hall,1985.
    [5]于国有,何玉敖,梁建文.层状半空间场地对地震波的放大作用[J].天津大学学报,1993,26(4):79-85.

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