不同上部结构高宽比的土-桩-隔震结构体系地震响应分析  

Seismic Response Analysis of Soil-Pile-Isolated Structures with Different Aspect Ratios of Superstructure

作　　者：单志承 于旭[2] 庄海洋 吴晓飞 SHAN Zhicheng;YU Xu;ZHUANG Haiyang;WU Xiaofei(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;Department of Civil Engineering,Nanjing Institute of Technology,Nanjing 211167,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Nanjing Jiangning Economic Technology Development General Company,Nanjing 211167,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009 [2]南京工程学院建筑工程学院,江苏南京211167 [3]华东交通大学土木建筑学院,江西南昌330013 [4]南京江宁经济技术开发集团有限公司,江苏南京211167

出　　处：《防灾减灾工程学报》2025年第2期405-415,共11页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金面上基金资助项目(51778282)资助。

摘　　要：为探究高宽比因素对柔性地基上基础隔震结构地震响应的影响,基于ABAQUS有限元软件建立了四种不同高宽比的传统抗震以及基础隔震框架结构模型,针对不同场地条件,建立柔性和刚性两种地基上的隔震结构模型对比,分析SSI效应对不同高宽比隔震结构地震反应规律及其隔震效率的影响。结果表明:随着高宽比增加,隔震结构楼层加速度峰值随层号增加先减小后增大,隔震层位移不断减小,隔震效率逐渐降低,但不同高宽比结构隔震效率随楼层号增加变化的规律不一致。当结构高宽比较小时,隔震效率在顶层最好;随着结构高宽比增大,隔震效率最优层出现在结构中间靠上部。此外,选取楼层加速度峰值、隔震层位移和隔震效率为研究参量,得出SSI效应在隔震层和结构顶层的影响明显强于其他楼层,SSI效应会增大隔震结构隔震层的位移反应,降低隔震体系的隔震效率,并且这种不利影响随着隔震结构高宽比增大在增强,因而在进行隔震结构设计时应综合考虑上部结构高宽比与SSI效应联合作用对结构可能产生的影响。To explore the influence of aspect ratio on the seismic responses of base-isolated structures built on flexible foundations,four traditional seismic-resistant and base-isolated frame structure models with different aspect ratios were established using ABAQUS finite element software.For different site conditions,models of base-isolated structures on both flexible and rigid foundations were established for comparison,so as to analyze the influence of Soil-Structure Interaction(SSI)effect on the seismic response patterns and isolation efficiency in structures with different aspect ratios.The results showed that with the increase of the aspect ratio,peak floor accelerations in isolated structures first decreased and then increased with increasing floor levels.Meanwhile,the displacement of the isolation layer continuously decreased,and the isolation efficiency gradually decreased.However,the variation patterns of the isolation efficiency with increasing floor levels were inconsistent among structures with different aspect ratios.For structures with smaller aspect ratios,the isolation efficiency was optimal at the top floor.As the aspect ratios increased,the optimal isolation efficiency layer appeared in the upper middle floors.Furthermore,by using peak floor acceleration,isolation layer displacement,and isolation efficiency as research parameters,it was concluded that SSI effect showed significantly stronger influence on isolation layers and top floor of structures compared to other floors.The SSI effect increased the displacement response of isolation layer in isolated structures and reduced the isolation efficiency of the isolation system.This adverse influence intensified with increasing aspect ratios of isolated structures..Therefore,when designing isolated structures,the combined influence of the aspect ratio of the superstructure and the SSI effect on structures should be comprehensively considered.

关 键 词：基础隔震结构 桩基础 高宽比 地震响应 隔震效率 

分 类 号：TU352[建筑科学—结构工程]