隔震支墩长细比研究

Study on Slenderness Ratio of Isolated Piers

《建筑抗震设计规范》(GB 50011—2010)(中华人民共和国住房和城乡建设部等,2016)中第12.2.9条第2款规定隔震层应满足嵌固刚度比要求,此要求使隔震支墩长细比较小,须单独增设1个隔震层,增加了结构造价,在一定程度上限制了隔震技术的应用。本文利用ANSYS软件分别对无隔震支座、常规隔震、柱顶隔震、柱底隔震4种方案的相同建筑进行地震时程反应分析及对比。结果表明,柱顶隔震、柱底隔震方案可行,隔震支墩长细比能达到普通层柱长细比,可推动隔震技术在多层建筑特别是学校、医院等建筑中的应用,提高隔震建筑经济性,为《建筑抗震设计规范》(GB 50011—2010)的修订提供一定理论依据。

In《Code for seismic design of buildings》12.2.9 stipulates that the isolation layer shall meet the requirements of fixed stiffness ratio, which makes the isolation pier’s slenderness ratio is small and a separated isolation layer must be set up. It increases the construction cost and limits the application of isolation technology to some extent.In this project, ANSYS was used to analyse the seismic time-history response of the same four schemes construction with no isolation bearing, column top isolation, column bottom isolation and conventional isolation. Then the results were compared. The results show that column top isolation, column bottom isolation is feasible.The isolation pier’s slenderness ratio can achieve common layer column slenderness ratio.It will drives the application of isolation technology in multi-storey buildings, especially in the schools, hospitals.It makes the isolation construction inexpensive.It will provide certain theoretical basis for the revision of《Code for seismic design of buildings》.