Loading Bearing Capacity Of The Standing Seam Roof System Under The Wind Load

As a new roofing system with excellent waterproof and thermal expansion property, metal standing seam roof system is widely used in large airport stations and railway stations. However, the light self-weight and the low joining strength of its occlusion site make standing seam roof system vulnerable to strong winds, and then lead to wind-induced failures constantly. From the above, we can find:the wind suction is a key control factor for the structure design of standing seam roof system. Studying the response of the structure system under wind load has engineering significance.Based on both domestic and foreign researchs, which focus on the wind resistance performance of standing seam metal roof system, this paper establishes the finite element model of roof system, summarizes various factors that influence the wind resistance performance of this structure system and put forward some improving measures correspondingly.(1) According to the available researches, the complex contacts of the actual structure is simplified and simulated by spring element. In other words, the tightening extrusion and the sliding friction, existing on the contact surface of the system, are simulated by the vertical displacement of metal arc edge and by the tangential spring respectively. With the help of this model, this paper analyses the static performance of metal roof panel under the action of wind, compares its results with the existing test data of roof panel, and validates the scientific of finite element simulation.Furthermore, in order to find out the ultimate bearing capacity of roof system, this paper builds refined finite element model based on above simplified method and analyses the stress of metal roof system edge under wind load. Calculation results of refined model and simplified model are compared to determine their own advantages and disadvantages.(2) The wind resistance of roofing system is analyzed by changing the finite element parameters of roof slab such as the thickness of roof panel, width of span roof panel, metal rolling edge friction coefficient and other factors. Then summarizing the influence of all kinds of parameters against wind, and providing constructive suggestions for the practical engineering design in this construction system,such as reducing width of roof board and increasing metal rolling edge friction coefficient. (3) Aiming at the limitations of small range of plate thickness and single selection of roof plates in the code for roofing products from metal roof in Europe (BS508-2-2000), the finite element calculation is compared with the design of the ability of roof boarding’s wind-resistance in the code of Europe to make a supplementary of it. The fuzzy definition of tightness of edge in the code(GB50429-2007) for design of aluminum alloy structure is improved to ensure the design of this structure’s wind-resistance.