中山博览中心屋顶为双向曲折形屋面造型,屋盖采用90m大跨度多跨折线形平面圆管钢桁架结构,楼层采用钢框架结构。结构平面尺寸达216m×126m,为减小温度作用,采用了支座混合布置温度内力释放技术,既释放了结构的温度内力,又能保证结构具有足够的稳定性。对于多管相贯和等径管相贯节点,采用新型鼓形圆管相贯焊接节点,与铸钢节点相比,质量好,加工和检测方便,造价低。 Zhongshan Expo Center roof for the two-way zigzag roof molding, roof 90m long span multi-line flat steel pipe truss structure, the use of steel frame structure. Structure of the plane size of 216m × 126m, in order to reduce the temperature effect, the use of a combination of support placement temperature internal force release technology, not only release the structure of the internal temperature and force, but also to ensure adequate structural stability. For multi-tube intersecting and equal-diameter pipe intersecting nodes, a new type of drum-shaped pipe is adopted to weld the joint nodes. Compared with the cast steel joints, the invention has good quality, convenient processing and testing, and low manufacturing cost.