软夹层地基上桩-土-层间隔震结构地震响应分析  

Seismic response analysis of pile soil interlayer isolation structure on soft interlayer foundation

作　　者：陈进 Chen Jin(CCECC Fuzhou Survey&Design Institute Co.Ltd,Fuzhou 350000,China)

机构地区：[1]中土集团福州勘察设计研究院有限公司,福建福州350000

出　　处：《工程抗震与加固改造》2022年第4期93-103,共11页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金面上项目(51778149);福建省建设科技研究开发项目(2021)。

摘　　要：隔震结构考虑土-结构动力相互作用(SSI效应)后,其动力特性发生改变,其中地基条件对结构的减震性能有一定影响。现阶段考虑SSI效应的研究主要为均匀土层,对软弱夹层地基上结构的地震反应研究较少。为此,开展软夹层地基上桩-土-层间隔震结构的动力响应和减震性能研究,探究不同地基土性和夹层厚度对其的影响。结果表明:软夹层地基放大地震波低频分量,过滤高频分量;层间隔震结构的减震效果与地基土性密切相关,硬土地基上层间隔震结构各类响应减震率无明显变化,仍具有较好的减震效果,而软夹层地基上层间隔震结构的减震率明显减小,减震效果差;软夹层地基上结构加速度及位移响应减震率随夹层厚度增加而明显降低。建议实际工程中在软夹层地基上采用层间隔震技术时应考虑SSI效应的影响,并加强下部结构的抗震设计。Considering the earth-structure dynamic interaction(SSI effect),the dynamic characteristics of the isolation structure change,and the foundation conditions have some influence on the shock absorption properties of the structure.Considering the SSI effect is mainly homogeneous soil layer,but few on respones of seismic reactions on structures on soft interlayer foundation.Therefore,the dynamic response and shock absorption properties of pile-soil-interlayer interval seismic structure are carried out to explore the influence of different foundation soil properties and interlayer thickness.The results show that enlarging the low frequency component of the seismic wave and filtering the shock absorption effect of the interlayer seismic structure is closely related to the soil properties of the foundation,and the acceleration of the structure and displacement response are significantly reduced with the increase of the interlayer thickness.It is recommended that the influence of SSI effect should be considered in adopting the soft interlayer seismic technology in the actual project,and strengthen the seismic design of the substructure.

关 键 词：层间隔震 SSI效应 软夹层地基 振动台试验 参数分析 

分 类 号：TU3521.12[建筑科学—结构工程]