Simulation Analysis of Steel Structure Construction of the Main Building Roof of Zhuhai Airport Terminal II

The grid structure is a spatial grid structure with various forms. Because of its advantages of good force performance, light weight, large rigidity, good seismic performance, low cost and easy forming, it is widely used in the roof of terminals, hangars, gymnasiums, theaters, exhibition halls, stations and other buildings. The roof of the main building of Terminal 2 of Zhuhai Airport adopts a largespan continuous ultra-long variable curvature hyperboloid local evacuation steel grid structure system. The modeling characteristics and structural system composition of the roof are introduced, and the construction process is carried out by partition and blocking cumulative lifting process according to its complexity, and the construction sequence is proposed and the lifting scheme is given. The construction steps of the steel structure of the main building roof are expounded, the construction steps of each step are simulated and analyzed, and the design load is applied to the grid structure after the unloading of the supporting frame, and the displacement and stress indicators of the whole process of the steel structure roof construction of the main building are obtained, and the performance of the steel structure of the main building based on construction simulation under the design and use load is evaluated. The construction technology that combines the whole process monitoring of the grid frame with the construction simulation is adopted, and the lifting status and block size of the grid are adjusted in real time through the comparison and analysis of the stress and strain values in the actual monitoring data and the simulation, so as to realize the accurate control of the force state of the grid lifting process. The results show that the construction scheme of the steel structure roof of the main building is feasible, and the structural deformation and internal force meet the requirements during the lifting process. After considering the influence of the construction process, the vertical deflection of mid span of the steel grid increases, and reliable measures should be taken to reduce the adverse effects caused by the increase of deflection; in the process from the beginning of construction to the final forming of the steel grid frame, the force mode of the local member changes from length to slenderness ratio control to force control, and the cross-section needs to be enlarged; it is necessary for the large-span grid frame to be reviewed by using the load input construction simulation analysis model according to the design after the construction simulation unloads the tire frame. The monitoring results show that the measured stress displacement of the grid frame is basically consistent with the construction simulation, which indicates the accuracy of the construction simulation analysis.