【摘要】 应用模态摄动法求解水平分层均匀土层的地震反应,通过大量的数值计算,讨论上海软土土性变化对土层基本周期和表面地震加速度反应的影响。数值结果表明:准确获取土层的动力参数对土层地震反应计算有重要影响,在现场实测获得较为翔实的土样动力特性参数的基础上,土层土性动力参数变异性所产生的计算误差是有限的。更多还原

【Abstract】 The seismic response of a layered soil in Shanghai region is analyzed by modal perturbation method. The effect of dynamic property variation of soil on the fundamental period of layered soil and the peak acceleration of seismic response at soil surface has been discussed by the determinate technique instead of random analysis. It is shown by using numerical results obtained from many case studies that acquiring accurately the dynamic property of soil medium from the soil site field is important for the seismic response analysis of layered soil and that the effect of variability of dynamic soil properties, which are measured accurately from the soil site field, on the calculation errors of seismic responses and fundamental period of the soil layer is limited.更多还原