考虑屋面种植的大跨度空间钢桁架抗震性能分析  

Analysis of seismic performance of large⁃span spatial steel truss considering roof planting

作　　者：朱朵娥 薛素铎[1] 兰永奇 杨霄 ZHU Duoe;XUE Suduo;LAN Yongqi;YANG Xiao(Faculty of Architecture,Civil and Transportation Engineering of Beijing University of Technology,Beijing 100124,China;Tsinghua University Architectural Design and Research Institute Co.,Ltd,Beijing 100084,China;National Nuclear Power Planning Design and Research Institute Co.,Ltd,Beijing 100095,China)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]清华大学建筑设计研究院有限公司,北京100084 [3]国核电力规划设计研究院有限公司,北京100095

出　　处：《建筑结构》2023年第19期121-127,共7页Building Structure

摘　　要：屋面种植的大跨度空间钢桁架结构具有跨度大、荷载重、混凝土屋面板刚度大等特点,其抗震性能是结构设计与分析中的关键问题,以考虑屋面种植的大跨度空间钢桁架为研究对象,采用MIDAS Gen软件对矢跨比为1/15,跨度为60m的大跨度空间钢桁架的动力特性及抗震性能进行了研究。分析结果表明,考虑屋面种植的大跨度钢桁架结构自振频率较小且分布十分密集,结构振型以竖向振动为主,且振型为长向单轴对称和双轴反对称振动形状交替出现,各振型间存在相互耦合作用;在8度多遇地震作用下,下弦及上弦最大动力系数达到了20%以上,受地震作用影响较大;计算分析模型中考虑屋面混凝土板刚度作用可提高桁架的整体刚度,加强桁架整体抗震性能。The large-span spatial steel truss structure with roof planting has the characteristics of large-span,heavy load,and high stiffness of concrete roof panels.Its seismic performance is a key issue in structural design and analysis.Take the large-span spatial steel truss considering roof planting as the research object,use MIDAS Gen software to study the dynamic characteristics and seismic performance of the large-span spatial steel truss with a rise to span ratio of 1/15 and a span of 60m.The analysis results indicate that the natural vibration frequency of the large-span steel truss structure considering roof planting is relatively small and densely distributed,and the structural vibration mode is mainly vertical vibration,with alternating longitudinal uniaxial symmetric and biaxial antisymmetric vibration shapes.There is mutual coupling between each vibration mode;Under the action of 8 degree frequent earthquakes,the maximum dynamic coefficients of the lower and upper chords reach over 20%,which is greatly affected by the earthquake.Considering the stiffness of roof concrete slabs in the calculation and analysis model can improve the overall stiffness of the truss and enhance its seismic performance.

关 键 词：屋面种植 大跨度空间钢桁架 抗震性能 屋面混凝土板刚度 

分 类 号：TU391[建筑科学—结构工程]