非均质地基振动特性及地震反应分析

Vibration behaviour and seismic response of vertically non-homogeneous soil deposits

基于改进的一维剪切梁模型，对于成层非均质场地推导了确定自振频 率、振型函数、参与系数及稳态动力响应的封闭型解析表达式，进而提出了场 地地震反应简化分析方法。在本模型中考虑了土壤特性（如密度与剪切模量） 沿深度的非均匀变化，通过对典型场地剖面的数值计算探讨了有关因素对场 地地震反应的影响。

Based on a generalized non-homogeneous shear-beam model, closed-form analytical expres- sions are derived for natural frequencies, modal displacements, participation factors and steady- state response function by transfer matrix approach. In thiS model, non-uniformly variations of soil density and shear modulus with depth are taken into consideration. Numerical computations are conducted for typical cases.