主塔干扰下的塔楼屋盖表面平均风压数值模拟

为考察有塔柱干扰时,下塔楼屋盖结构的风压系数,以某工程为背景基于Fluent6.3软件分析了不同风向角下结构表面的平均风压,并讨论了屋盖不同区格的风致干扰效应系数及其随风向角的变化规律。结果表明,当来流位于塔柱之间时,由于狭管效应会使得来流加速,从而导致结构表面风压增大,相比无干扰模型最不利风工况下竖向整体风压系数增大约52%。同时受主塔结构干扰,屋盖不同区格风致干扰效应系数分布不均,在屋面板设计时应引起重视。

Numerical Simulation of Mean Wind Pressure on TV Tower Roof with Wind-induced Interference Effects

In order to investigate the wind pressure coefficients of the roof on TV towers with the interference of adjacent tower columns, a case study of a practical project was performed based on the software package Fluent6.3. The mean wind pressures on the roof were analyzed as well as their wind induced inteoCerence factors （IF）. The rela- tion between IF and wind directions were also studied by changing the flow＇s direction. The results show that great wind suction will be produced when the flow blows between the tower columns clue to the effect of narrow and the global vertical wind pressure coefficient increases about 52% in the most unfavorable condition compared to no interference model. In addition IF in different regions of the roof deviates greatly from each other and emphasis should be laid on the design of the roof panels.