土壤——多层结构相互作用体系地震位移响应基本上是由第一振型控制的,只要知道了体系的基本周期T_1及第一振型阻尼比D_1,即可由地震记录的位移反应谱求出该体系地震位移响应的近似值。因此,对相互作用体系的基频及第一振型阻尼比进行近似计算有着重要的工程意义。 关于基础有埋深的土壤——结构相互作用体系基频及第一振型阻尼比,Bielak曾经作过 The seismic displacement response of the soil-multilayer structure interaction system is basically controlled by the first mode shape. If the fundamental period T_1 of the system and the damping ratio D_1 of the first mode are known, the displacement response spectrum of the seismic record can be obtained. The approximate seismic displacement response of the system. Therefore, it is of great engineering significance to approximate the fundamental frequency and damping ratio of the first mode of the interaction system. On the basis of the underlying soil-structure interaction system fundamental frequency and first mode damping ratio, Bielak has done