| The standing seam metal roof system has the advantages of light weight,strong anti-corrosion and durability,excellent waterproof performance,beautiful appearance,and easy installation and construction.Therefore,it is widely used in various large-span space structure systems in China,such as sports stadiums,railway station buildings,airport terminals,theaters,and other largespan buildings.However,in recent years,incidents of wind uplift accidents frequently occur in the standing seam metal roof system,resulting in huge economic losses.Therefore,researching the wind uplift resistance performance of the standing seam metal roof system has significant practical engineering significance.In this paper,the standing seam metal roof system is taken as the research object.Combined with the typical wind uplift test,the simplified model analysis is established by using ANSYS finite element software.The influence of various parameters on the wind uplift resistance of the standing seam metal roof system is studied in detail and the wind uplift design calculation method is proposed.The main research contents are as follows :(1)A simplified model of the standing seam metal roof system is established using ANSYS finite element software.The relative sliding between adjacent roof panels is ignored,and the roof is simplified as a whole panel.The contact between the rolled edges of the roof panel and the Tshaped bracket is connected using spring elements.Based on the actual failure form and failure criteria,the experimental results are compared with the finite element results to verify the correctness of the simplified model and lay the foundation for subsequent research.(2)Based on the failure criteria,the simplified model is used to analyze the influence of five parameters,namely the panel width,panel thickness,T-shaped bracket length,spacing,and roof panel material strength,on the wind uplift resistance performance.The results show that reducing the panel width and T-shaped bracket spacing,increasing the panel thickness and T-shaped bracket length,and improving the roof panel material strength can all enhance the wind uplift resistance performance of the metal roof system.The optimal value ranges of each parameter are obtained,and the key parameters affecting the wind uplift resistance performance are determined.(3)Based on the validated simplified model,a simplified model with wind-resistant standing seam lock edge metal roof is established,in which the clamping force of the wind-resistant clip on the roof panel coil edge is simulated by spring tension.The influences of three parameters,including the length of the wind-resistant clip,the length of the tail wing,and the spacing,on the windresistant performance of the roof are analyzed.The results show that increasing the length of the wind-resistant clip,the length of the tail wing,and the spacing can improve the wind-resistant performance of the roof with wind-resistant clip,not only obtaining the optimal value range of each parameter,but also determining the key parameters that affect the wind-resistant performance of the roof with wind-resistant clip.(4)In order to improve the wind resistance performance of the standing seam metal roof system,based on the finite element simulation results,according to the actual failure mode of the roof panel and the basic principle of structural mechanics,a simplified mechanical model of different failure modes of the standing seam metal roof under positive and negative wind pressure is proposed.Based on the small deformation theory,the failure criterion is reasonably transformed,and two formulas for calculating the ultimate wind pressure are derived.In addition,the correctness of the two ultimate wind resistance bearing capacity formulas and the scope of use are verified by finite element software modeling.Finally,the rationality of the formulas is proved by typical engineering cases. |
