Studies On The Performance Of Standing Seam Metal Roof Under Wind Uplift Load

Standing seam metal roof,which is often used in large-span roof system due to the advantages of lightweight,high strength,good waterproof performance and resistance to temperature stress,is one of the most widely used metal roof systems.In recent years,standing seam metal roof has caused frequent engineering accidents because of its performance defect under wind uplift load.However,the relevant references and specifications for the clear design method and calculation regulations for the performance of standing seam metal roof under wind uplift load have not been available so far.Therefore,the wind uplift resistance of standing seam metal roof has been systematically studied through three aspects: experiment,finite element simulation and design method in this paper,aiming at providing references for practical engineering.Firstly,through relevant references and specifications at home and abroad,the existing problems of standing seam metal roof in actual Chinese engineering was analyzed,the domestic and foreign research results of latest experiments and simulations on the wind uplift resistance of standing seam metal roof were summarized,the calculation regulations for standing seam metal roof in the specifications of China,Europe and North America were compared and the problems were pointed out in this paper.Focusing on the deficiency in the existing research,12 sets of wind uplift resistance tests of aluminum-magnesium-manganese standing seam metal roof were carried out in this paper.The whole process test phenomenon of standing seam metal roof from loading to destruction was obtained and the stress state of the standing seam metal panel during the whole pressurization process was analyzed.The load-strain curves and the load-displacement curves of some groups in the whole process were obtained and the influence of the panel width,panel thickness,T-code spacing,T-code length,initial deformation of locked edges and wind-resistant fixture on wind uplift resistance of standing seam metal roof was studied.The research results can provide a basis for the design method and performance evaluation of standing seam metal roof.Based on the experimental research,the nonlinear analysis function of the general finite element software Abaqus was used to establish eight solid models considering the large deformation effect by introducing the contact equivalence method in this paper.According to the analysis of the finite element simulation results,the whole damage process of standing seam metal roof under wind uplift load was revealed,and the reasonable criterion for determining damage was proposed.The finite element calculation results were in good agreement with the experimental results.Based on the experimental research and finite element simulation results,a simplified calculation model for wind uplift resistance of standing seam metal roof was proposed in this paper.On the basis of simplified calculation model and related assumptions,through the reasonable transformation of the failure criterion and the fitting based on the test results,the formula for calculating the ultimate wind pressure of standing seam metal roof was obtained and the deflection span ratio limitation of aluminum-magnesium-manganese standing seam metal roof was given.In addition,a cost estimation method based on wind uplift resistance was proposed and the correctness of the calculation formula of the wind uplift limit pressure for standing seam metal roof was verified based on the actual engineering case.The research results can provide technical support for the design and detection of wind uplift resistance of standing seam metal roof.