Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
The steel roof can be divided into three parts: the roof of the swimming pool, the roof of the central hall and the roof of the gymnasium. The single-layer and double-layer mesh shell structure system is adopted, and the roof of the swimming pool and the stadium can be divided into double-layer mesh shell, single-layer mesh shell, boundary truss, door arch truss, etc. The roof of the central hall can be divided into single-layer mesh shell and two bucket structures. The steel structure roof has a large span and complex shape, and the steel structure members are mainly box bending and torsion members. The construction scheme of “large walking tower crane lifting and partial hydraulic lifting” is adopted to complete the construction of the steel structure roof.
First of all, the general idea of steel structure installation is introduced, the steel structure is divided into three areas and five construction zones, the lifting area and the lifting area for cross-construction and finally for partition unloading. Secondly, the cumulative model analysis method in MIDAS software is applied to simulate the whole process of steel structure installation and unstrut unloading by beam section simulation. The stress and deformation under the control conditions during installation and unloading in each construction section are emphasized, and the maximum stress and deformation at each stage are analyzed and compared with the stress and deformation under the design state. The stress and deformation of the steel structure after unloading and installation meet the requirements of JGJ 7-2010 “Technical Regulations for Space Grid Structure”, which can ensure the safety of the construction process. Then, by selecting the mid-chord rod of the natatorium, gymnasium and central hall as the stress control unit, and the nodes of 1/2 span and 1/4 span as the control points of vertical deformation, the whole process of stress and deformation in the construction process is analyzed, and it is found that the stress and deformation of the control unit of the natatorium, gymnasium and central hall change greatly during the dismantling and unloading process. They are less affected by the rest of the construction phase. Finally, the lifting construction of the lifting area in the middle of the gymnasium and the natatorium is analyzed, and it is found that the area where the rod stress is relatively large occurs near the lifting point, and the stress ratio is reduced after the dismantling and unloading, which meets the construction safety requirements. The simulation results of the whole construction process verify the feasibility of the construction method, and the stress and displacement response of the whole construction process meet the safety requirements of construction. Due to the large structural boundary stiffness of the natatorium, the central hall and the gymnasium, the construction process has little influence on each other, which verifies the feasibility of the construction method of partition installation and partition unloading.
