架空碟形空间结构风场数值模拟和抗风优化

基于计算流体动力学方法,利用FLUENT软件对架空碟形空间结构的风场绕流特性和表面风压分布进行数值模拟,获得不同风向角下结构风压分布,分析了支撑柱高度、上碟面和下碟面矢跨比对风载体型系数分布和结构风致整体合力的影响.结果表明,支撑柱高度的选择既要有利于空气泄流,又要防止因高度过高引起风致整体合力的增大.研究发现,随着上下碟面矢跨比增加,迎风面正风压显著增大,背风面涡旋作用更加明显,结构风致整体合力呈增大趋势,碟面扁平化可明显改善结构抗风特性.给出的架空碟形空间结构抗风优化建议,可为该类结构抗风设计提供参考.

Numerical Simulation of Wind Field and Wind-Resistant Shape Optimization of Built-on-Stilts Type Disc-Shape-Like Spatial Structures

Numerical Simulation of Wind Field and Wind Resistant Shape Abstract： Based on the computational fluid dynamics (CFD) method, the wind flow characteristics and wind pressure distribution of the built on stilts type disc shape like spatial structure were numerically simulated at different incoming wind directions by using the Fluent software. The influence of the height of the supporting column, the height span ratio of the top and the bottom structural surfaces on wind pressure distribution and wind loading shape coefficients was analyzed. The results show that the height of the supporting column should be chosen carefully to allow wind pass easily and to reduce wind load force. With the increase of height span ratio of the top and the bottom structural surfaces, the positive wind pressure on windward, the vortex effect on the leeward and the overall wind loading force increase significantly. It is found out that a lower curvature surface will significantly improve the structural wind resistant characteristics. Finally, some conclusions on wind resistant structural shape optimization were reached, which could provide some references for the design of this kind of structures.