建筑钢结构进展2024，Vol.26Issue(3)：1-11,11.DOI:10.13969/j.cnki.cn31-1893.2024.03.001
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
摘要
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分类
建筑与水利引用本文复制引用
韩庆华,景铭,芦燕,刘铭劼..大跨度钢桁架隔震结构隔震性能及影响规律分析[J].建筑钢结构进展,2024,26(3):1-11,11.基金项目
国家自然科学基金(U1939208、52022067) （U1939208、52022067）
