南太湖湿地奥体公园游泳馆屋盖钢结构设计

南太湖湿地奥体公园游泳馆屋盖东西对称,屋盖曲面依建筑造型确定。采用变截面箱型钢梁结构体系,最大跨度为56.8m,两侧悬挑最大跨度为28.7m,入口处最大悬挑跨度为21.0m。选择其中跨度最大的一榀钢曲梁,比较梁单元模型和板单元模型建模计算的异同,然后用梁单元建立整体分析模型,分析比较了屋面钢结构单体模型和上下部分总装模型计算结果的不同。结果表明,因建筑效果而设置的中间两榀纵向钢梁,由于跨度过大而无法作为横向钢梁的支承点;设置加劲板可有效提高翼缘或者腹板抵抗局部屈曲的能力;因为单体模型中已包含钢柱,且屋盖与下部混凝土仅通过16根立柱相连,所以钢结构单体模型和上下总装模型的结果相近。

Structural design on steel roof of the natatorium in Nantai Lake Olympic Wetland Park

The steel roof of the natatorium in Nantai Lake Olympic Wetland Park is on west-east symmetry,which is determined by the architectural modeling.The roof is composed by variable cross-section steel beam with box shape system,and the maximum span is 56.8m long,with the 28.7m cantilever span in the both sides and 21.0m in the entrance.The beam element and the shell element model of the longest-span beam are created respectively and the results are compared.In addition,both the roof structure by the beam element and the whole structure including the below concrete structure are modeled.Because of the long span,the two middle longitudinal beams set according to the architectural shape can not support the transverse beams.The capacity of flanges and webs to resist local buckling is improved significantly by the stiffened plates.For roof structure including the 16 columns,the results of two structural models are quite close.