Wind Pressure Characteristics And Aerodynamic Optimization Of Stadium Grandstand’s Large-span Cantilevered Roof

Due to its unique appearance and the advantages on space and functions, large-span structure has been very popular in modern architectures, and in the big family of large-span structures, cantilevered structure has been widely used because of its distinctive features and functions, especially in stadium designs. The stadium grandstand cantilevered roof is a typical application. It has a large span, soft structure, light weight and so on. So it’s a wind-sensitive structure. For further research on wind load characteristics on the surface of the roof, this article mainly has carried on the following research works:(1) It reviews the research progress of the wind pressure characteristic of stadium grandstand’s large-span cantilevered roof and its wind resistance at home and abroad. It also establishes the basic theory and equations of numerical simulation between structure surface and the wind field around the structure. Then, it determines the calculation method which basis of the average Navier-Stokes and RNGk-ε-turbulence model.(2) Based on the numerical simulation method, it analyzes the independent form of the grandstand cantilever roof’s wind load characteristics under the action of different wind angles, drawing the conclusion that the angle0°direction is the most unfavorable wind direction.Based on the most unfavorable wind direction angle, it analyzes the influence of surface wind load characteristics by different parameters such as the roof’s angle, the length of cantilever, various forms stand below the roof,and the like.In addition, it also analyzes the interference effect of wind load on the surface of the downstream’s roof which affected by the upstream sub-grandstand. The results are as follows:relative to the influence of the roof’s wind load by the cantilever length and forms of stand,roof angle is larger. So the roof’s angle should be reduced as far as possible in the practical engineering; the exist of upstream sub-grandstand reduce the wind load of downstream’s roof which is good for downstream wind resistance of the roof.(3) On the basis of the above research results, it discusses those two following aerodynamic optimization measures,adding wind deflector and slotting size at the roof’s leading edge. It deeply analyzes the key parameters such as the position and form of the wind deflector,the slot size. Finally it achieves some practical conclusions, which provide the beneficial reference for practical engineering of wind resistance design.