500m口径射电望远镜(FAST)索网结构风致破坏概率评估  

Wind⁃induced damage probability evaluation for five⁃hundred⁃meter aperture spherical telescope cable⁃net structure

作　　者：杨洋阳 李宏男[1] 李超[1] 李庆伟[2] 付兴[1] Yang Yangyang;Li Hongnan;Li Chao;Li Qingwei;Fu Xing(Dalian University of Technol-ogy,Dalian 116024,China;Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]大连理工大学,辽宁大连116024 [2]中国科学院,北京100101

出　　处：《土木工程学报》2024年第8期1-8,22,共9页China Civil Engineering Journal

基　　金：国家自然科学基金(52027811,11973006)。

摘　　要：大跨空间索网结构风敏感性突出,极易遭受风荷载影响。针对目前缺乏此类结构抗风性能评估方法的问题,以大跨空间索网结构FAST为例,提出一种基于实测风场数据的风致破坏概率分析方法。采集1971年~2020年结构所处地区的大量实测风速数据,通过概率分布拟合建立场地的风灾危险性模型。建立FAST的精细化有限元分析模型并模拟风荷载时程输入,采用非线性动力时程分析对结构的风振反应进行计算,基于概率性需求模型绘制易损性曲线。最后,结合得出的风灾危险性和结构易损性,计算得出FAST结构在所处场地实际风灾环境中的破坏概率。研究表明:该地极限风速为17m/s,风速在0~10m/s的概率最大;在120°、210°和300°风向角下,下拉索均为易损构件,210°风向角上吸风对索网结构最不利;在最不利风向角下,结构达到轻微破坏、中等破坏和严重破坏的总破坏概率分别为1.8359×10^(-4)、1.1499×10^(-5)和1.3202×10^(-6)。The wind sensitivity of large⁃span spatial cable⁃net structure is prominent,and it is vulnerable to wind load.In view of the lack of evaluation methods for wind resistance of such structures,a wind⁃induced damage probability analysis method based on measured wind field data is proposed by taking the large⁃span spatial cable⁃net structure FAST as an example.A large number of measured wind speed data in the structure⁃located area from 1971 to 2020 were collected,and the wind hazard model of the site was established by probability distribution fitting.The refined finite element analysis model of FAST is established and the wind load time⁃history input is simulated.The wind⁃induced vibration response of the structure is calculated by nonlinear dynamic time⁃history analysis.The fragility curve is drawn based on the probabilistic demand model.Finally,in combination with the wind hazard and structural fragility,the damage probability of the FAST structure in the actual wind disaster environment is calculated.The results show that the limit wind speed is 17 m/s,and the probability of wind speed in the range of 0-10 m/s is the largest.At 120°,210°and 300°wind direction angles,the adjust cables are all vulnerable components,and the wind suction at 210°wind direction angle is the most unfavorable to the cable⁃net structure.At the most unfavorable wind direction,the total damage probability of the structure to achieve slight damage,moderate damage and severe damage is 1.8359×10^(-4),1.1499×10^(-5)and 1.3202×10^(-6),respectively.

关 键 词：FAST 索网结构 风灾危险性 风致易损性 破坏概率 

分 类 号：TU393.3[建筑科学—结构工程]