某椭球形采光顶支承结构稳定性与抗震性能分析  

Study on stability and seismic performance of ellipsoidal single⁃layer grid shell

作　　者：张涛 王立超 蔡一栋 王振龙 ZHANG Tao;WANG Lichao;CAI Yidong;WANG Zhenlong(Beijing Runzhi Commercial Operation Management Co.,Ltd.,Beijing 101500,China;Shanghai Cima Engineering Consulting Co.,Ltd.,Shanghai 200001,China)

机构地区：[1]北京润置商业运营管理有限公司,北京101500 [2]上海熙玛工程顾问有限公司,上海200001

出　　处：《建筑结构》2024年第9期95-101,133,共8页Building Structure

摘　　要：单层网壳兼具薄壳结构及杆系结构的力学特征,属于缺陷敏感型结构,结构稳定性起主要控制作用。以某椭球形三向网格型单层网壳玻璃采光顶支承结构为研究对象,对其进行弹塑性全过程稳定分析,建模求解椭球形单层网壳在长、短轴半跨及满跨活载工况下结构整体稳定性系数,通过数值分析得出椭球形单层网壳在满跨活载工况下整体失稳的风险高于半跨活载工况,结构整体稳定性对荷载不对称分布不敏感;鉴于本工程的重要性,在不同烈度下的结构抗震能力分析中,结构的抗震设防目标需提高到大震不屈服。The single⁃layer grid shell has the mechanical characteristics of both thin shell structure and rod structure,which belongs to the defect⁃sensitive structure,and the structural stability plays a major controlling role.An ellipsoidal three⁃way grid⁃style single⁃layer mesh shell glass roof supporting structure was taken as the research object,and its elastic⁃plastic full⁃process stability analysis was carried out,and the overall stability coefficients of the ellipsoidal single⁃layer mesh shell under long and short axes half⁃span and full⁃span live⁃loading conditions were modeled and solved,and it is concluded from numerical analysis that the risk of the overall instability of the ellipsoidal single⁃layer mesh shell is higher than that of the half⁃span live⁃loading condition under the full⁃span live⁃loading condition,and the overall stability of the structure is not sensitive to the load asymmetrical distribution.In view of the importance of this project,in the analysis of the seismic capacity of the structure under different intensities,the seismic fortification target of the structure was raised to no structural buckling under strong earthquake during the seismic performance analysis of the structure.

关 键 词：单层网壳 特征值屈曲 初始几何缺陷 弹塑性全过程分析 抗震性能分析 

分 类 号：TU311.4[建筑科学—结构工程]