大跨度钢桁架隔震结构隔震性能及影响规律分析
Seismic Isolation Performance and Influence Rule Analysis of Large-Span Steel Truss Isolated Structures
韩庆华 1景铭 2芦燕 1刘铭劼1
作者信息
- 1. 天津大学中国地震局地震工程综合模拟与城乡抗震韧性重点实验室,天津 300350;天津大学滨海土木工程结构与安全教育部重点实验室,天津 300350;天津大学建筑工程学院,天津 300350
- 2. 天津大学建筑工程学院,天津 300350
- 折叠
摘要
由于大跨空间结构竖向振动问题突出,水平隔震支座难以有效控制结构的竖向地震响应.将摩擦摆水平隔震支座和空气弹簧-摩擦摆三维隔震支座应用于大跨度钢桁架中,分析钢桁架水平隔震结构和三维隔震结构的隔震控制效果.结果表明,水平隔震和三维隔震均延长了结构自振周期,隔震后一阶振型为上部桁架结构沿水平方向的整体平动.时程分析显示,在普通地震动、近断层脉冲型地震动和远场长周期地震动作用下,水平隔震支座对桁架水平和竖向节点峰值加速度的平均隔震率分别为43.4％和9.2％,三维隔震支座对桁架水平和竖向节点峰值加速度的平均隔震率分别为43.8％和24.4％,水平隔震支座和三维隔震支座对桁架峰值等效应力的平均隔震率分别为4.2％和17.7％.水平隔震支座和三维隔震支座对桁架水平地震响应控制效果基本相同,三维隔震支座对结构的竖向地震响应控制效果更好.
Abstract
Due to the prominent vertical vibration of large-span spatial structures,it is difficult for horizontal isolation bearings to reduce the vertical seismic response of the structure effectively.In this paper,the friction pendulum system(FPS)horizontal isolation bearing and the air spring-FPS three-dimensional isolation bearing were applied to a large-span steel truss,and the isolation control effects of the horizontal isolated structure and three-dimensional isolated structure under different ground motions were analyzed.The results show that both horizontal and three-dimensional isolation bearings can significantly prolong the natural vibration period of the structure,and the first vibration mode is the horizontal translation of the upper truss structure.The dynamic time-history analysis indicates that under ordinary ground motion,near-fault pulse-type ground motion,and far-field long-period ground motion,the average isolation rates of horizontal isolation bearing to the horizontal and vertical nodal peak acceleration of the truss are 43.4％and 9.2％respectively,and the average isolation rates of three-dimensional isolation bearing to the horizontal and vertical nodal peak acceleration of the truss are 43.8％and 24.4％,respectively.The average isolation rates of the horizontal and three-dimensional isolation bearing to the member peak von Mises stress of the truss are 4.2％and 17.7％,respectively.The horizontal and three-dimensional isolation bearing has the same control effect on the horizontal seismic response of the truss,and the three-dimensional isolation bearing has a better control effect on the vertical seismic response of the structure.
关键词
钢桁架结构/摩擦摆水平隔震支座/空气弹簧-摩擦摆三维隔震支座/长周期地震动/隔震性能Key words
steel truss structure/FPS horizontal isolation bearing/air spring-FPS three-dimensional isolation bearing/long-period ground motion/isolation performance引用本文复制引用
基金项目
国家自然科学基金(U1939208)
国家自然科学基金(52022067)
出版年
2024
国家科技期刊平台
NSTL
万方数据