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为减少大跨空间钢结构在施工期间的温度效应,合拢施工的方法逐渐被采用。本文以深圳大运会体育场采用的“折面空间网格结构”为工程背景,依据气象统计资料确定结构合拢施工阶段时的变温度荷载,采用考虑时变效应的施工过程状态非线性分析方法,针对大运会体育场钢结构的四种合拢施工方案进行了全过程模拟分析。对各方案中结构内力和变形的全过程发展进行了比较,结果表明:合拢线的数量对结构的温度效应有较大影响。合拢线由2条增至4条,最大应力和最大位移分别由55MPa和21mm减小至38MPa和17mm,且杆件轴力明显减小;合拢线的位置对结构的温度效应影响较小。不同方向引起的最大温度应力和位移相差分别在5 MPa和1mm以内,其中沿斜向设置合拢线的方案最优。但在实际施工中,沿南北向设置合拢线较为合理。
In order to reduce the temperature effect of large-span steel structures during construction, methods of closing construction are gradually adopted. In this paper, the “tectonic space grid structure” adopted by Shenzhen Universiade stadium is taken as the engineering background, and the variable temperature load during the construction phase of structure closure is determined according to the meteorological statistic data. By adopting the nonlinear state analysis method of construction process considering the time- According to the four kinds of construction plans of the steel structure of Universiade Stadium, the whole process of simulation was analyzed. The whole process of structural internal forces and deformation in each program is compared. The results show that the number of the folded wires has a great influence on the temperature effect of the structure. The closing line is increased from 2 to 4, the maximum stress and the maximum displacement are decreased from 55MPa and 21mm to 38MPa and 17mm respectively, and the axial force of the bar member is obviously reduced; the position of the closing line has little effect on the temperature effect of the structure. The maximum temperature stress and displacement caused by different directions are within 5 MPa and 1 mm, respectively. Among them, the scheme of placing the collapse line in the oblique direction is the best. However, in the actual construction, it is reasonable to set the folding line along the north-south direction.