土层刚度排序对平面P波场地放大效应的影响

The Influence of the Stiffness Alignment of Soil Layears on the Site Amplification of Planar P Waves

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.