隔震支座布置形式对坡地吊脚楼结构抗震性能的影响研究  

Study on the influence of the layout of isolation bearings on the seismic performance of stilted buildings on the slope

作　　者：李瑞锋 刘立平[1,2] 尹力 韩树旺 李英民[1,2] LI Ruifeng;LIU Liping;YIN Li;HAN Shuwang;LI Yingmin(College of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of Earthquake Resistance and Disaster Prevention for Engineering Structures,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学工程结构抗震防灾重庆市重点实验室,重庆400045

出　　处：《地震工程与工程振动》2024年第1期148-157,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51878101,52278481);重庆市建设科技项目(城科字2020第3-16);重庆市研究生科研创新项目(CYB22030)。

摘　　要：以坡地吊脚楼为研究对象,针对结构不等高嵌固的特点,分别设计了无隔震、基础隔震和第二层柱底隔震(层间隔震)这3种三维吊脚框架结构算例。开展算例模型的弹性反应谱分析和弹塑性动力时程分析,考察隔震支座布置形式对吊脚框架结构动力响应、破坏模式以及地震倒塌概率等抗震性能的影响规律。结果表明:将隔震技术运用于坡地吊脚框架结构中可以控制结构动力响应,为改善吊脚框架结构抗震性能提供了新途径;设置基础隔震可改善结构刚度分布的不均匀性,降低吊脚柱之间剪力差异,提高吊脚短柱安全储备,但不同标高处隔震支座的变形存在差异;与基础隔震相比,层间隔震对结构损伤控制的能力更优,层间隔震模型上部楼层变形更为均匀,地震倒塌概率更低,但在层间隔震结构设计中应考虑适当减小吊脚柱间侧向刚度的差异。In this paper,the stilted buildings were taken as the research object,and according to the characteristics of unequal height embedded structure,three types of three-dimensional stilted frame structures were designed:non-isolation,base isolation and the second floor column bottom isolation(interlayer isolation).Then elastic response spectrum analysis and elastic-plastic dynamic time history analysis of analysis models were carried out to investigate the influence of different isolation bearing layout on the dynamic response,failure mode,probability of seismic collapse and other seismic performance of stilted frame structures.The results show that the application of seismic isolation technology to the stilted frame structure on slope can control the dynamic response of the structure and improve the safety margin of the whole structure,which provides a new way to improve its seismic performance.The setting of base isolation can improve the non-uniformity of structural stiffness distribution,reduce the difference of shear distribution between stilted columns and improve the safety reserve of the shortest columns.However,there are differences in the deformation of isolation bearings with different levels.Isolation bearings with different lateral stiffness should be arranged in the base isolation model.Compared with the base isolation,the interlayer isolation has better ability to control the structural damage,the deformation of the upper floor is more uniform,and the probability of seismic collapse is lower.However,in the interlayer isolation design,it should be considered to appropriately reduce the difference of lateral stiffness between stilted columns.

关 键 词：吊脚框架结构 隔震支座 抗震性能 动力响应 地震倒塌概率 

分 类 号：TU375.4[建筑科学—结构工程]