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哈尔滨万达滑雪场钢屋盖为双向正交正放网架结构体系,采用带支撑累积滑移方法进行安装,沿屋盖纵向共设置三列临时支撑。提出“先跨中,后两侧卸载”与“先两侧,后跨中卸载”两种屋盖卸载方案,运用有限元分析软件MIDAS/Gen,通过对临时支撑上部无限刚度梁单元的降温与钝化进行钢屋盖卸载数值模拟,对比分析两种方案卸载过程中的临时支撑轴力、屋盖结构主要杆件应力与节点位移。分析结果表明,卸载完成时两种方案的屋盖结构主要杆件应力与节点位移最大差别百分比仅为8.5%;卸载阶段楼面节点竖向位移变化值为10mm,约是结构跨度的1/10000;“先跨中,后两侧”卸载方案的临时支撑最大轴力大于“先两侧,后跨中”方案为49.06%,建议采用“先两侧,后跨中”的卸载方案。
The steel roof of Harbin Wanda Skiing is a two-way orthogonal orthogonality grid structure system, which is installed by the method of cumulative slip with support. Three columns of temporary supports are provided along the longitudinal direction of the roof. Proposed “unloading in the first and after” on both sides of the front and rear unloading “two roof unloading ” two kinds of roof unloading program, the use of finite element analysis software MIDAS / Gen, through the temporary support of the upper infinite rigidity beam Unit cooling and passivation of the steel roof unloading numerical simulation, comparative analysis of the two programs unloading process of temporary support axial force, roof structure of the main bar stress and node displacement. The results show that the maximum difference between the stress and the displacement of the main bar of roof structure is only 8.5% when the unloading is completed. The vertical displacement of the floor node during unloading is 10mm, which is about 1/10000 of the span of the structure ; “First cross in the back” on both sides of the uninstall program temporary support maximum axial force greater than “first two sides, after the cross ” program is 49.06%, it is recommended to use Uninstall program.