局部开口对封闭柱面网壳风荷载影响

Effects of local openings on wind loads of an enclosed cylindrical latticed shell

局部开口对封闭大跨度空间结构风荷载影响很大,通过刚性模型测压风洞试验对底部和顶部有局部开口的两端封闭三心圆柱面网壳结构的风荷载分布进行了研究,对比不同开口状况下结构的力系数及风荷载分布,给出了局部开口对风荷载及其分布的影响规律,如强负压区的局部开口能有效的减小结构表面的风吸力,而正压区域的局部开口会增大结构表面的风吸力,这些规律为类似结构的抗风设计及防风措施提供了合理的建议。

The effects of local openings on wind loads of an enclosed large span spatial structure were considered. Wind loads distribution on an enclosed three-center cylindrical latticed shell with local openings was studied via a rigid model wind pressure test in a wind tunnel.The wind force coefficients and wind loads distributions of the structure in different local openings cases were compared.The variation laws of wind loads distribution versus local openings were gained.It was shown that the suction on structure surface is decreased by the local openings of a strong negative wind pressure region whereas it is increased by the local openings of a positive wind pressure region.The results provided a suggestion for wind-resistant design and wind-resistant measures of similar structures.