Study On Wind-resistant Capacity Of Typical Metal Roof Panels

In recent years,metal roof system has been widely used in various large-span structures,such as stadiums,theatres and airports.The roof system is easy to construct and adaptable to the project,which is favored by engineers.However,in recent years,there have been many accidents of engineering metal roof uncovered by wind in coastal and inland areas.The problem of wind resistance of metal roof needs more attention.Wind resistance of metal roofs can be divided into two aspects: wind resistance and fatigue.The main research in this paper is the wind-resistant capacity of metal roof panels.Using Abaqus for finite element modeling analysis,the effects of various parameters on the bearing capacity of roof slabs and the method of improving the wind-resistance of roof system were studied in detail.The main work and main results obtained are as follows:(1)Two typical metal roofs are modeled and analyzed by Abaqus and compared with the existing wind-resistant test results to verify the rationality of the model.(2)Based on the reasonable and reliable finite element model,combined with the failure modes of the two types of panels under the wind-resistant test,and through a large number of loading and unloading simulations,the failure criteria of them under normal use conditions are established.Using this criterion,several factors affecting the wind-resistant capacity of roof are parameterized.The factors considered include purlin spacing,plane thickness,panel strength and panel width.The formulas for calculating the normal wind-resistant capacity of two kinds of metal roofs are obtained by fitting and analyzing a large number of data obtained by numerical simulation.(3)Finite element simulation is carried out for the standing seam roof panel with additional wind clips,and the criteria for distinguishing the failure modes are formulated.Through a large number of loading and unloading simulations,the failure criteria of two different failure modes under normal use state are formulated.The failure criterion is used to analyze the effect of wind clips on the bearing capacity of roof panel,and the influence of various parameters on the normal wind-resistant capacity of roof system with wind clips is studied,and the reference formula is fitted.(4)Aiming at the stress concentration problem caused by the wind clips,an optimization method of the size of the wind clips is proposed,which is to change the length and curvature radius of the end of the wind clips.Through the finite element simulation analysis,the recommended values of the length and curvature radius of the end of the wind clips are obtained.The numerical analysis results show that the optimization process reduces stress concentration and further improves the wind-resistant capacity of roof panels.The research results of this paper have important practical reference value for the wind resistance design and the improvement of wind-resistant capacity of relevant metal roofs.