不同矢跨比弦支穹顶在柔性悬挂斗屏荷载作用下的稳定性及自振特性研究  

Stability and natural vibration characteristics of suspen-dome with different rise-span ratios under action of flexible hanging bucket screen

作　　者：王秀丽[1,2] 陈铭 刘体峰 郭通 WANG Xiu-li;CHEN Ming;LIU Ti-feng;GUO Tong(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Northwest Research Center of Disaster Prevention and Mitigation in Civil Engineering of MOE,Lanzhou University of Technology,Lanzhou 730050,China;China 17th Metallurgical Group Co.,Ltd.,Ma'anshan 243000,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]中国十七冶集团有限公司,安徽马鞍山243000

出　　处：《空间结构》2024年第4期3-11,共9页Spatial Structures

基　　金：国家重点研发计划项目(2019YFD1101004);甘肃省住房和城乡建设厅科研项目(JK2020-26)。

摘　　要：以某柔性悬挂斗屏的弦支穹顶屋盖为工程背景,研究了不同矢跨比弦支穹顶在悬挂斗屏荷载作用下的稳定性能以及自振特性.主要利用有限元软件ANSYS进行分析,通过同一拉索预应力确定准则来计算不同模型索力,以确保矢跨比为单一研究变量.利用一致缺陷模态法来考虑初始几何缺陷,对结构进行双重非线性全过程分析,用位移控制法对位移控制点进行荷载-位移路径跟踪,得到考虑双重非线性的荷载因子及最大位移值,以此来判断结构的稳定承载力.结果表明,当结构的矢跨比在0.10附近时,模型的稳定性能将会发生较大变化.利用分块Lanczos法分析了不同矢跨比模型的自振特性,探讨了悬挂斗屏荷载对不同矢跨比弦支穹顶自振特性的影响规律.结果表明,前6阶振型以斗屏的运动为主,且不同矢跨比模型自振频率呈线性变化.The static and dynamic characteristics of a suspend-dome roof with a flexible hanging bucket screen under different rise-span ratios are studied.The finite element software ANSYS is used for modeling and analysis,and the cable forces of different models are calculated by the determination criterion of the same cable prestress to ensure that the rise-span ratio is the single research variable.The consistent imperfection mode method is used to consider the geometric initial imperfections,and the whole process double nonlinear analysis is carried out on the structure.The displacement control method is used to track the displacement path of the displacement control points,and the double nonlinear load factor and the maximum displacement are obtained,so as to judge the stability bearing capacity of the structure.The results show that when the rise-span ratio is about O.1,the static performance of the structure will change greatly.The natural vibration characteristics of the models with different rise-span ratios are analyzed by using block Lanczos method.The effects of rise-span ratios on the static stability of the supen dome under the load of hanging bucket screen and on the natural vibration characteristics are discussed.The results show that the first 6 modes are dominated by the movement of the bucket screen,and the natural vibration frequency varies linearly with the rise-span ratio.

关 键 词：弦支穹顶 悬挂斗屏 稳定性 自振特性 矢跨比 

分 类 号：TU394[建筑科学—结构工程]