土-结构相互作用对消能减震结构损伤谱的影响  

Influence of soil-structure interaction on damage spectra of passive energy dissipation structures

作　　者：王曙光[1] 杜东升[1] 刘伟庆[1] 王海[1] 

机构地区：[1]南京工业大学,江苏南京211816

出　　处：《土木工程学报》2015年第4期84-90,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(51178219;90815017);土木工程防灾国家重点实验室开放课题基金项目(SLDRCE10-MB-06)

摘　　要：消能减震结构是一种应用广泛的结构抗震体系,文中研究地震荷载下土-结构相互作用(SSI)对消能减震结构Park-Ang损伤谱的影响。消能减震结构模拟成恢复力体系为Takeda滞回模型的单自由度体系,消能减震装置假设为黏滞阻尼,地基土的动力特性采用系统化的集总参数模型表示。研究表明无论是否考虑土-结构相互作用,随着结构阻尼比的上升,消能减震结构的Park-Ang谱在整个周期段上都得到很大的降低。然而,当消能减震结构总体阻尼比达到15%~20%时,随着地基土的剪切波速下降,整个周期段上Park-Ang损伤谱都会呈现出加大的趋势。与非减震结构相比,消能减震结构需要考虑SSI效应可能产生的不利影响。The influence of soil-structure interaction( SSI) on damage spectra of passive energy dissipation structures is investigated under seismic loading. A systematic lumped-parameter model is used to model the dynamic behavior of the foundation sitting on soil. The passive energy dissipation devices are assumed to be viscous type. The structure is modeled as a single degree of freedom( SDOF) system which is based on the Takeda model. The results are presented in the form of damage spectra of the key parameters variations. For building systems without energy dissipation devices,it is found that when the shear wave velocity of soil decreases,the damage index of short-period buildings is substantially increased due to SSI. However,the damage index of long-period buildings decreases with the decrease of the shear wave velocity of soil. For the structures with passive energy dissipation devices,especially for the structures with high damping,the damage indexes of short-period and long-period buildings are gradually increased due to SSI. Therefore,SSI has unfavourable influence on the structures with passive energy dissipation devices compared to the structures without the devices.

关 键 词：土-结构相互作用 消能减震结构 损伤指数 损伤谱 Takeda滞回模型 

分 类 号：TU352.1[建筑科学—结构工程]