临沂启阳机场航站楼屋盖单双层混合曲面网格结构设计

The single-layer and double-layer hybrid cambered grid structure is used in Linyi Qiyang airport terminal roof to realize the large-span column-free space and the architectural form of the uplift in the middle. The total plane size of the roof structure is 243 m × 180 m, of which the size of the single-layer reticulated shell is 72 m × 48 m, and the shape of the curved surface is obtained by numerical inverse hanging method. The whole roof is supported by 56 inclined columns. The maximum span and cantilever span of the roof is 83 m and 20 m, respectively. The roof adopts two types of bearings, including unidirectional elasticity hinge bearings and fixed ball joint bearings. Bearing capacity analysis, overall stability analysis, earthquake resistance analysis and key joint analysis are conducted for the roof structure using simulation method. The main results are as follows. The single-layer reticulated shell determined by numerical inverse hanging method mainly transmits load through the in-plane path, while the double-layer part can provide ideal boundary support conditions, so that the shell thrust can transmit the internal force reliably. The 20 unidirectional elasticity hinge bearings set at air-side can adjust the torsion effect caused by stiffness irregularity, and release the temperature deformation to reduce the structure temperature stress. Various initial imperfection modes and unfavorable action of temperature rise are considered in the overall stability analysis, and the overall stability safety factor of the roof structure is 2.88. The single-layer reticulated shell has a high safety reserve subjected to the rare earthquake; the damaged components are mainly distributed in the double-layer part with larger height and the cantilever region with less plastic development. The key joints in the single-layer reticulated shell and transition region have appropriate safety reserve, which satisfy the design principle of strong connection.