Experimental And Numerical Study On Behaviors For The Continuous Welded Stainless Steel Roofing System Of Zhaoqing Sports Center

Continuous welded stainless steel roofing system has good wind resistance and can be used as roofing system.In the paper,the continuous welded stainless steel roofing system is taken as the research object.The strength experiment of the resistance seam welding lap joint and the experiment of the continuous welding of the stainless steel roofing system were carried out under the step load.The correctness of model was verified through simulation and experiment results which based on the ANSYS Workbench.Besides,the influence of different roof panel thickness,weld height and X span of welded stainless steel roofing system was studied.The main work and conclusions of this paper are as follows:1.The stretch-bending experiment and the tensile-shearing experiment were carried out for the resistance seam welding lap joint.The tensile-bending test results show that,the 65 A is used to make the specimen well,with the increase of current,the flexural capacity of the specimen increases at first then decreases.According to the position of fracture,the tear position is gradually closer to the edge with the current increasing.The tensile-shearing experiment results show that,the 60 A to 70 A is selected to make the test piece better.Because 55 A is small,the heat energy produced by the welding machine is not enough to make the weld seam to form a strong core area,therefore the weld were opened.When the 60 A to 70 A is selected.The strong core area is formed at the weld seam,and the material stainless steel plate is broken under the external force.2.Combined with Zhaoqing Sports Center,the experimental model of continuous welded stainless steel roofing system was made,and the static wind-resisting experiment is carried out.After the static wind-resisting experiment,the structure has not been damaged greatly.All the panels are permanently deformed and all the supports are in good condition.It is proved that the continuous welded stainless steel roofing system have a good performance of wind resistance.3.Based on the ANSYS Workbench,the model of welded stainless steel roofing system is set up.The simulation results are compared with the experimental results to verify the correctness of the finite element model,and the deformation and stress performance of the welded stainless steel roofing system were analyzed.The results show in the X direction of the finite element model,the equivalent stress at the end fixed place is greater in the two ends,and the equivalent stress decreases at first then increases when the support is near the supports.In the same span,the deflection of the middle span is the biggest and the displacement near the support is the smallest.Because the area of the plate face near the ends is smaller,the force of the support at the two ends is smaller than others,and the support reaction in the other span is remain unchanged.When the load is increasing,the vertical plate near support rises outwards,the vertical plate and the weld are stretched and extruded.The equivalent stress of the vertical plate and the weld joint is larger,and the plastic deformation is first produced.When the load is increasing,the middle part of the roof is raised upward.The edges of the roof panel and the vertical plate near the support produce tensile and extrusion,which leads to the larger equivalent stress at the vertical plate near the support,which produces plastic deformation at first.For the continuous welded stainless steel roofing structure with X direction and Y well distributed,the X direction of the model can be simplified to 5 span,the Y direction can be simplified to 1 span,which is convenient for engineering application.4.The parameters of the welded stainless steel roofing system were studied on different plate thickness,weld height and length of X span.It was recommended to use the selected parameters in the project.The analysis results show that: With the increase of plate thickness,the deflection of the plate gradually decreases,the equivalent stress increases gradually.The deflection of the plate and the vertical plate near the support was reduced,the equivalent stress at the weld seam increases.The deflection of the plate increase with the weld height,the deflection of the plate increases gradually,the equivalent stress increases gradually,The deflection of the juncture increases gradually,and the equivalent stress at the weld decreases gradually.With the increase of the X to the span,the deflection of the plate increases gradually,the equivalent stress gradually decreases,the deflection of juncture was gradually increased,and the equivalent stress at the weld seam increases gradually.Combining the relevant conclusions with the economic benefits of the actual project,it is recommended to use a 0.5mm thick stainless steel roof plate with a weld height of 16 mm to 18 mm and an X-direction span of 400 mm.