飓风作用下某大跨体育馆屋盖的结构选型分析

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。

ANALYSES OF STRUCTURAL TYPE SELECTION FOR THE LONG-SPAN ROOF OF A GYMNASIUM CONSIDERING HURRICANE

Analyses of structural form selection of a gymnasium in the Philippines were carried out.The maximum wind speed for design is 215 km/h,the wind force is 17 level and it belongs to hurricane.Therefore,the designs of long-span roof become especially difficult.The lower natatorium roof was used to be the top roof's supports and stand.The top roof was a long-span space steel truss structure which had a span dimension of 130.0 m×31.0 m.Considering the characteristics such as roof being large span and its overall structure being super-long,the plane pipe truss was used in top roof and the spatial triangle pipe truss structure was used in the lower roof and stands.Due to comparison and selection of different structure schemes,pipe truss structure,space truss structure set with pulling up and down prestressed cable,space truss structure with pulling up prestressed cable and self-balance steel-tube filled with concrete were selected.Analyses models were built and the nonlinear analyses were performed.Structural deflection,members dimension,structural materials,and construction difficulties were investigated,it was found that scheme 3 had a good economy and structural performance,which was suitable for long-span structures under hurricane.The research results can be referenced by designing other similar long-span structures.