土层性质对P波场地放大效应的影响  

THE EFFECT OF AMPLIFICATION OF P WAVES BY SOIL PROPERTY

作　　者：崔静[1] 郭琪[1] 

机构地区：[1]天津大学土木工程系,天津300072

出　　处：《低温建筑技术》2007年第1期76-78,共3页Low Temperature Architecture Technology

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弹性场地的放大效应。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。控制点选在假想基岩露头,通过直接刚度法求解表面和底面位移与控制点位移的比值,即放大系数。比较匀质土层与更实际的刚度增长土层的参数对入射P波的放大效应的影响。P waves amplification of flexible space were analyzed by direct matrix method in frequency domain. The dynamic - stiffness matrix of the total system were calculated by assembling the matrices of individual elements. The location of the control point was chosen at an assumed rock outcrop, and using direct matrix method to computed the ratios of the absolute values of the displacement amplitude of the top or the bottom of the ground to the ones of rock outcrop, that is amplifications. To compare the effect of amplification by the parameter of homogeneous layer and the more realistic site with increasing stiffness, selecting average soil properties to replace increasing stiffness seems to be adequate for motions at the base, but not at the top of the layer.

关 键 词：匀质土层 刚度增长土层 P波 放大系数 

分 类 号：TU441.35[建筑科学—岩土工程]