| The metal roof system is a building envelope structure composed of a supporting system and a metal roof panel.Compared with the traditional thicker reinforced concrete roof,it has the advantages of light weight,beautiful appearance,flexible design,and convenient construction,so it is more popular in modern architecture.With the rapid development of Chinese infrastructure,large-span buildings such as railway stations,terminal buildings,and stadiums have emerged,and the development of metal roofs is also changing with each passing day.Due to the large number of applications of metal roofing,some of its shortcomings are gradually exposed.The most important problem is that the metal roof panel has poor wind resistance.Therefore,it is of great significance to analyze the wind-proof analysis and countermeasures of large-span metal roofs.The main content of this article is the wind resistance of large-span metal roofs.The finite element software ANSYS is used for numerical analysis.The influence of various factors on the wind-proof performance of metal roof panels is studied in detail and countermeasures are proposed.The main contents are as follows:(1)The existing metal roofing system is classified through three aspects: system structure,connection form and panel material.By summarizing the advantages and disadvantages of various metal roofing systems un der their different structures,forms and materials,it is convenient for designers and analysts to choose metal roofing systems suitable for different situations.At the same time,through statistics and analysis of various metal roofing system wind expos ure accidents and various experimental studies that have occurred at home and abroad in recent years,the cause and mode of damage are summarized to provide basis for selection of topics for follow-up research.(2)The finite element software ANSYS was use d to establish a finite element model of a typical metal roof system,and the rationality of the model was verified by comparing the experimental results of the existing metal roof with wind resistance.At the same time,through theoretical analysis and nu merical simulation,a number of parameters that affect the ability of the metal roof system to be exposed to wind were summarized,and the significance of the multiple factors was studied by using the orthogonal experimental design method to obtain the key to the ability of the system to resist the wind factor.(3)Through the wind tunnel test study of a large-span metal roof system,the sensitive areas of the overall roof system to wind load are obtained,and different wind resistance measures are taken according to the changes of wind pressure in different areas,so as to optimize the entire roof system reinforcement plan;at the same time,comparisons are also made.The pros and cons of the two local wind-resistant and uncovered reinforcement measures are presented,which provides a reference for subsequent actual projects.(4)On the basis of the aforementioned research and analysis,this paper proposes an improved scheme and simplified mechanical calculation model for the main reason of the metal roof system’s resistance to wind peeling damage(the failure of the T-shaped connector and the seam of the metal roof panel).The solution mechanically engages with the metal roof panel through a new type of snap-fit connector that can rotate and slide freely,and uses the rotation and sliding of the connector to relieve roof deformation and temperature stress,so that the entire roof system is flexible and variable,and reduces the cost.The occlusal failure causes the possibility of the roof being damaged by wind peeling,thereby improving the wind peel resistance performance of the entire roof panel;at the same time,based on the results of numerical analysis,this paper gives a simplified mechanical calculation model of the metal roof system using the new T-shaped connector.Combined with related assumptions and failure criteria,the ultimate bearing capacity calculation formula of the system is derived for reference in subsequent projects. |
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