建筑结构学报2024，Vol.45Issue(10)：144-157,14.DOI:10.14006/j.jzjgxb.2023.0650
三维湍流风场中雨滴竖向运动特性及FAST索网结构风雨振响应研究
Characteristics of vertical motion of raindrops in a three-dimensional turbulent wind field and response of rain-wind induced vibration of cable-net structural system of FAST
摘要
Abstract
To reveal the dynamic response characteristics of large-span spatial structures under the co-effect of wind and rain,the vertical velocity variations of raindrops in a three-dimensional turbulent wind field were investigated in this paper.The motion equations of each raindrop were derived in a three-dimensional turbulent wind field,which could reveal their falling trajectories and velocities results.Besides,the concept of vertical velocity ratio of raindrops was introduced,and the recommended ratio values at a certain level of confidence were obtained through the construction of rain pressure probability distribution.Multivariate nonlinear regression analysis was applied to establishing a fitting formula of recommended value of vertical velocity ratio and calculation for the vertical velocity of raindrops was confirmed.Finally,given that both the positive and negative surfaces of general structures could collide with raindrops,a calculation model of rain load for general structures was established,and the response of the cable-net structural system of FAST to the co-effect of wind and rain was investigated.The results show that the raindrops exhibit complex and nonlinear motion characteristics in a three-dimensional turbulent wind field,and the vertical terminal velocity of raindrops is not consistent with empirical vertical terminal velocity any more.Under the co-effect of wind and rain,the average translational displacement of the FAST cable network nodes,which is induced by rain loads,reaches 39.7％of the total average,illustrating a large impact of rain loads on the dynamic response of large-span spatial flexible structures.The study concludes that the co-effect of wind and rain on the large-span spatial flexible structures cannot be neglected in structural design.关键词
FAST索网结构/三维湍流风场/风驱雨/雨滴竖向末速度/雨荷载Key words
cable-net structural system of FAST/three-dimensional turbulent wind field/wind-driven rain/vertical terminal velocity of raindrops/rain load分类
建筑与水利引用本文复制引用
王成宇,李宏男,付兴,李庆伟..三维湍流风场中雨滴竖向运动特性及FAST索网结构风雨振响应研究[J].建筑结构学报,2024,45(10):144-157,14.基金项目
国家自然科学基金项目(52027811,11973006). （52027811,11973006）
