(1 上海建筑设计研究院有限公司, 上海 200041; 2 上海大学土木工程系, 上海 200444)

摘要: 上海某中学校史馆为三层钢结构,其地下一层为篮球场,层高 9. 6m,结构跨度 34. 8m,需考虑竖向地震作用下的结构安全性和振动舒适度. 介绍了校史馆所采用的三维隔震技术方案及其水平、竖向响应控制效果等关键技术问题. 在篮球场顶部与上部结构之间设置隔震层,共布置 16 套三维隔震支座,结构水平隔震周期 2. 679s,竖向隔震周期 1. 233s. 设防烈度地震作用下 X、Y 向的水平减震系数平均值分别为 0. 36、0. 33,罕遇地震作用下结构最大层间位移角为 1 / 244,结构仍处于弹性状态. 三向地震作用下,上部结构的竖向加速度减震率可达到 35. 8%,罕遇地震下竖向支座的剪应变均小于 250%限值. 通过三维隔震设计可显著减小上部结构的地震响应,实现结构的性能化设计.

关键词: 钢结构; 大跨结构; 三维隔震; 竖向地震; 性能化设计

中图分类号:TU398. 7 文献标志码:A 文章编号:1002-848X(2023)01-0059-06

DOI:10. 19701 / j. jzjg. SHY2316

Three-dimensional seismic isolation design and seismic analysis of a middle school in Shanghai

ZHANG Jian1, LIU Wenguang2, LI Menglu1, XU Hao2, CHEN Mufeng2

(1 Shanghai Institute of Architectural Design & Research Co. , Ltd. , Shanghai 200041, China;2 Department of Civil Engineering, Shanghai University, Shanghai 200444, China)

Abstract: The history hall of a middle school in Shanghai is a three-story steel structure. The first-floor underground is abasketball stadium with a height of 9. 6m and the structural span is 34. 8m. The structural safety and vibration comfortsubjected to the vertical earthquake should be considered. The three-dimensional seismic isolation technology schemeadopted for the history hall and its horizontal and vertical response control effects and other key technical issues wereintroduced. A seismic isolation layer was set between the top of the basketball stadium and the superstructure,consisting of16 three-dimensional isolators. The horizontal isolation period of the structure is 2. 679s and the vertical isolation period is1. 233s. Under the seismic action of the fortification intensity, the average values of the horizontal damping coefficients in Xand Y directions are 0. 36 and 0. 33 respectively, and the maximum interlayer displacement angle of the structure is 1 / 244under the action of rare earthquakes, and the structure is still in an elastic state. The vertical isolation effect of thesuperstructure can reach 35. 8% calculated by the acceleration under three-dimensional earthquake. And the shear strain ofthe vertical bearing is less than 250% subjected to the rare earthquake. Three-dimensional seismic isolation design cansignificantly reduce the seismic response of the superstructure and realize performance-based design of the structure.

Keywords: steel structure; large-span structure; there-dimensional isolation; vertical earthquake; performancebased design

∗国家自然科学基金(52078287),国家自然科学基金(52108461).

作者简介:张坚,学士,教授级高级工程师,一级注册结构工程师,英国特许工程师,主要从事工程抗震技术及复杂建筑结构研究,Email:zhangjian@ isaarchitecture. com.

[引用本文] 张坚,刘文光,李梦露,等. 上海某中学三维隔震设计与抗震分析[J]. 建筑结构,2023,53(1):59-64,134. ZHANG Jian,LIU Wenguang,LI Menglu,et al. Three-dimensional seismic isolation design and seismic analysis of amiddle school in Shanghai[J]. Building Structure,2023,53(1):59-64,134.