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菲律宾某地最大设计风速达到215 km/h,风力17级,属于飓风,因此大跨屋盖的结构设计异常困难。该地的某大跨体育馆的下层屋盖为游泳馆屋盖,并作为上层屋盖的支承点和看台;上层屋盖为大跨度空间钢桁架结构,屋盖东西长为130.0 m,南北宽为31.0 m。考虑屋盖跨度大、整体结构超长的特点,上层屋盖采用平面管桁架形式,下侧游泳馆屋面及看台采用空间三角管桁架结构。基于屋盖结构方案的可行性比选,选取普通框架管桁架结构、斜拉空间桁架、斜拉空间桁架加配重3种方案,进行结构整体建模的非线性分析,比较整体结构的挠度、构件规格、结构用材以及可施工性。分析认为,结构方案3具有较好的经济性和结构性能,比较适用于考虑飓风作用下大跨空间结构的结构形式。
Somewhere in the Philippines, the maximum design wind speed reaches 215 km / h and the wind power is 17, which is a hurricane. Therefore, the structural design of long-span roofs is extremely difficult. The lower part of a large-span stadium in the area is the swimming pool roof and serves as the supporting point and stands of the upper roof. The upper roof is a large-span steel truss structure with a 130.0 m long east-west roof and a wide north-south width of 31.0 m. Taking into account the large span of the roof, the overall structure of the characteristics of long, upper roof with flat tube truss form, the lower swimming pool roof and stands with spatial triangular trussed structure. Based on the feasibility comparison of roof structure scheme, three schemes of ordinary frame tube truss structure, diagonal space truss, oblique space truss plus counterweight are selected to conduct nonlinear analysis of the overall structural model, and to compare the deflection of the whole structure, Specifications, structural materials and workability. According to the analysis, the structural scheme 3 has better economy and structural performance, and is more suitable for considering the structural form of the long-span space structure under the effect of the hurricane.