主次结构减震特性研究

本文探讨了主次结构的减震特性以及土－结构相互作用对减震效果的影响，在一定条件下，次结构对主结构有减震作用，其减震效果与主次结构的刚度比和质量比、次结构的阻尼和输入地震动的特性有关，对于多层建筑，次结构既可能减小主结构的加速度，也可能减小其相对位移，对于高层建筑、则主要是减小主结构的相对位移，对于中软至弱地基条件，ＳＳＩ效应明显降低高层建筑的加速度反应；对于中等地基条件，ＳＳＩ效应显著降低次结构对高

STUDY ON SHOCK ABSORBING CHARACTERISTICS OF PRIMARY AND SECONDARY STRUCTURE SYSTEM

In this paper, the shock absorbing characteristics of the primary and secondary structure system and the effect of the soil-structure interaction (SSI) on the shock absorbing efficiency (SAE) are discussed in detail. In some cases, the secondary structure with a relatively small mass and a high damping ratio can be an effective way to reduce the primary structure response to earthquake excitations, and the SAE depends on the stiffness and mass ratios of primary and secondary structure, the damping ratio of secondary structure and the input seismic ground motion characteristics. For multistoried buildings, the secondary structure can effectively reduce both acceleration and relative displacement response of primary structure, but for tall buildings, it is only effective to reduce the relative displacement response. The effect of SSI can obviously reduce the acceleration response of tall buildings for mid-soft to soft ground, besides, for general ground condition, it can largely reduce the SAE of secondary structure on the tall buildings, furthermore, almost all dismiss its effectiveness for soft ground condition.