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对不同开洞工况下的超高单层厂房模型进行风洞试验,研究不同开洞工况对厂房纵墙内外表面风压分布的影响,给出风压体型系数沿纵墙长度方向的变化规律并与规范值进行对比。试验结果表明:当山墙单一开洞时,对外风压分布影响不大;当两端山墙均开大洞时,纵墙内外表面风压沿来流方向衰减较快;山墙单一开洞会导致纵墙所受的极值风压增大,靠近开洞山墙的纵墙端部受风荷载较大,可以称之为端部效应;对山墙单一开洞厂房,纵墙在近开洞的端部区和其他区的最不利负风压(吸力)分别出现在0°(开洞墙面为正迎风面)和15°风向角;对于两端同时开洞工况,两端部区最不利负风压(吸力)出现在45°和135°风向角,非端部区则出现在150°风向角;所有工况中以较小开洞工况受力最为不利;对于迎风端部区排架水平受力最不利的工况为两端山墙都开大洞的情况。
Wind tunnel test was carried out on the model of ultra-tall single-storey factory under different opening conditions to study the influence of different opening conditions on the wind pressure distribution on the internal and external surfaces of the longitudinal wall of the plant, and the variation of wind body coefficient along the length of the longitudinal wall Laws and comparison with the norms. The results show that the external wind pressure distribution has little effect when the single gable hole is opened. When both ends of the gable are open large holes, the wind pressure on the inner and outer wall of the longitudinal wall attenuates rapidly along the flow direction. Single gable hole will lead to the vertical wall The extreme pressure suffered by the wind pressure increases, near the end of the longitudinal wall of the opening gable wall by the wind load is larger, which can be called the end effect; on the gable single hole plant, longitudinal wall in the near end hole area And the most unfavorable negative wind pressure (suction) of the other zones appear at 0 ° (the wall surface of the opening is a positive windward surface) and the wind direction angle of 15 ° respectively. For the simultaneous opening operation at both ends, the most unfavorable negative wind Pressure (suction) appears at 45 ° and 135 ° wind direction angle, and the non-end area appears at 150 ° wind direction angle. In all conditions, the working condition with the smaller opening is the most unfavorable. For the windward end section, The most unfavorable working condition is that the gables are open at both ends.