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南太湖湿地奥体公园体育场外形如同百合花,采用叠合开口双层网壳结构体系,由高低两个屋面叠合而成。屋盖钢结构与下部钢筋混凝土看台部分完全脱开,全都支承在标高6.500m的观众室外平台上。在屋盖悬挑端设置观光走廊。由于屋盖钢结构中间开椭圆形洞口,周边六个入口部分同样对屋盖有削弱作用,所以高低屋面各自单独受力时无法满足承载要求,必须通过高低屋面之间的腹杆将之连接成一个整体受力。分别介绍了内力分析、特征值屈曲分析、几何非线性分析、几何材料双重非线性分析、以及典型相贯节点有限元分析的结果,考虑了半跨活荷载的不利影响。分析表明,该屋盖钢结构具有较好的整体稳定性;对于初始缺陷不敏感;当网壳的最大竖向位移超过1m后,较多杆件进入屈服状态,需要通过双重非线性分析才能获得接近实际的稳定承载力。
South Lake Taihu Wetland Olympic Park Stadium shape like a lily, the use of overlapping double-decker reticulated shell structure system, by the height of two roof overlap. The roof steel structure is completely detached from the lower reinforced concrete stands and all are supported on the outdoor viewing platform with the elevation of 6.500m. Set in the cantilevered roof tourist corridor. Because of the open oval hole in the middle of the roof steel structure, the six entrance parts around the roof also have the weakened effect on the roof. Therefore, when the roof and the roof are individually stressed, they can not meet the bearing requirements and must be connected by the webs between the roofs A whole force. The results of internal force analysis, eigenvalue buckling analysis, geometric nonlinear analysis, geometrical double nonlinear analysis and finite element analysis of typical intersection nodes are introduced respectively, and the adverse effects of semi-span live load are considered. The analysis shows that the roof steel structure has good overall stability and is insensitive to the initial defects. When the maximum vertical displacement of the shell exceeds 1 m, more rods enter the yield state and need to be obtained by double nonlinear analysis Close to the actual stable bearing capacity.