某机场项目大跨空间网架结构施工方法对比研究

Comparative study on construction methods of long-span space grid structure in an airport project

为了研究不同安装方法下,大跨空间网架结构受力和变形的差异,以某机场航站楼网架为工程案例,利用MIDAS Gen软件进行了施工过程模拟,选取了5个最不利工况,对比研究了高空散装法和分条分块安装法下网架的最大挠度和最大应力。结果表明:当悬臂长度过大时,无支撑高空散装法难以满足网架挠度和应力的容许值,设立临时支撑可以有效减小网架的最大挠度和应力;在合理分块和合理选取吊点的情况下,分条分块安装法下网架的最大挠度和最大应力要远小于高空散装法,更具安全性。

This paper aimed to study the stress and deformation differences of long-span space grid structures under different installation methods. Taking the space grid structure of an airport terminal as an engineering case, the construction process was simulated by MIDAS Gen. The maximum deflection and maximum stress of space grid under high-altitude scattered splicing method and strip and block installation method were compared and studied. The results show that: When the cantilever length is too large, it is difficult to meet the allowable value of deflection and stress of the grid without support. The establishment of temporary support can effectively reduce the maximum deflection and stress of the grid. Under the condition of reasonable block and reasonable selection of lifting points, the maximum deflection and maximum stress of the grid under the strip and block installation method are much less than the high-altitude scattered assembly method, which is more safe.