Abstract: Continuous welded stainless steel metal roofing system is a new type of metal roofing maintenance system. Because of its easy processing, light weight and high strength, it has been widely used in various large public buildings such as stadiums, terminal buildings, and railway stations in recent years. The problems involved in continuous welding of stainless steel metal roofing systems are comprehensive and complex. This has also led to our country's lack of relevant construction and management specifications for metal roofing systems, which is not conducive to the promotion and application of this type of roofing. Based on the above problems, this article carried out related research on the continuous welding of stainless steel metal roof system.
Firstly, the metal roof structure is introduced. Through the analysis of the structure of the continuous welding stainless steel metal roof system, its advantages are summarized:good integrity and sealing, excellent durability, and low maintenance cost. Based on the finite element analysis software MIDAS Fea, a numerical simulation analysis model of metal roof aluminum panels is established to simulate the failure process of the roof system under wind load, and the wind resistance performance of the continuous welded stainless steel metal roof system is studied and analyzed. A uniform load of 8. 0 kN/m²2 along the positive direction of the z-axis is applied to the aluminum plate of the metal roof, and the deformation and force of the aluminum plate are analyzed.
The analysis results show that the middle position of the triangular plate has the largest displacement, and the direction is mainly along the positive z-axis; compared with the middle position plate, the edge plate has a larger displacement due to poor restraint; for the edge position plate and the middle position plate, when the load reaches 6. 4 kN/m², increase the same load, the displacement increment becomes larger, that is, the load-displacement curve shows a nonlinear growth, and the aluminum plate produces nonlinear deformation. Under the uniform load of 8. 0 kN/m², the stress at the grooves of the adjacent triangular aluminum plates is relatively large, and it will enter the shaping stage first; in the triangular aluminum plates, the stress at the corner points is the most concentrated, so the stress increases faster, and the stress is the largest; the connecting plate at the groove is connected to the substructure by bolts. During the load transfer process, the vertical load on the roof triangular plate is transmitted to the bolts through the connecting plate. Because the bolt connection is weak, stress is likely to occur the phenomenon of concentration, which will lead to structural damage. Corresponding strengthening measures should be taken when necessary.
Through the modal analysis of the structure, the first 5 modes and periods are obtained. The wind pressure time history analysis is performed on the roof panel, and the maximum displacement and stress response corresponding to each measuring point are obtained. On this basis, combined with the failure mode of the metal roof aluminum panel under the action of wind suction, several suggestions for improving the roof wind resistance ultimate bearing capacity are put forward.