南昌绿地国际博览中心结构设计

Structural design of Nanchang Greenland International Expo Center

南昌绿地国际博览中心屋面采用大跨度空间钢桁架体系,在屋面上方设置波浪形的曲线构架,主立面采用668m长的拉索幕墙结构,拉索幕墙由单向垂直跨越的预应力拉索体系支承,拉索预应力加载在由V形柱支撑的转换桁架上。针对V形柱及抗连续性倒塌性能做了重点分析。考虑到建筑物体量巨大,受高度及体型的影响,建筑物周围风环境状况复杂,因此对主体结构及幕墙风洞试验进行了研究,风洞实验结果表明,围护结构的屋面最大负风压是规范值的1. 8倍,墙面最大正风压为规范值的1. 6倍。

The roof of Nanchang Greenland International Expo Center adopts a large-span spatial steel truss system,with wavy curved frame above the roof.The main elevation adopts 668 m long cable curtain wall structure.The cable curtain wall is supported by a one-way vertical spanning prestressing cable system.The cable prestressing force is loaded on the transformation truss supported by V-shaped columns.The V-shaped column and its continuous collapse resistance were emphatically analyzed.Considering the effects of huge volume,the height and shape of the building,the wind environment around the building was complex,so the wind tunnel tests of the main structure and curtain wall were studied.The wind tunnel test results show that the maximum negative wind pressure on the roof of the enclosure structure is 1.8 times of the norm value,and the maximum positive wind pressure on the wall is 1.6 times of the norm value.