Numerical Simulation Of Wind-Induced Loads On Ladder-Type Cantilevered Roof Of Stadium

The long-span roof structures are widely used because of its novel modeling,large space utilization and multi-functional advantages.Owing to the light weight,large flexibility,small damping and low natural frequency of such structures,the influence of wind load on them can not be ignored.At present,the wind load design parameters of long-span roof with complex shape are not specified in the current Load Code in China,so it is necessary to study the wind load characteristics of such complex structures.In this paper,the Dangshan Sports Center is taken as the research background,aiming at its special ladder-type long-span cantilever roof,considering the geometric characteristics of the structure itself and the influence of surrounding buildings,numerical simulation of the wind field in the sports center area containing many venues is carried out under each wind direction.In addition,considering that the roof of the stadium is significantly affected by the aerodynamic interference of adjacent buildings,combined with the single situation of the stadium,the influence of the surrounding buildings on the wind load distribution of the stadium roof is compared in depth.It provides effective theoretical guidance and direct design basis for wind resistance design of the same type of large-span stepped cantilever roof.The main research contents are as follows:(1)The basic characteristics of atmospheric boundary layer wind,the basic theory of computational fluid dynamics(CFD)and the governing equations are described.The main methods of turbulence numerical simulation are introduced.The advantages and disadvantages of several methods are compared.The wind speed profile and turbulence profile are realized by C language programming.(2)Based on the local geomorphological and meteorological conditions,the wind pressure distribution on the roof surface of Dangshan Stadium(monomer)was simulated and analyzed for different wind directions,and the wind pressure distribution characteristics and the surrounding flow field characteristics of the stepped roof of the stadium under each wind direction were studied.(3)In order to systematically analyze the wind load characteristics on the roof surface,the roof is divided reasonably,and the variation rule of the shape coefficient of the roof partition with the wind direction is obtained,and the most unfavorable wind direction is determined.(4)Considering the interference effect of surrounding buildings and structures,numerical simulation is carried out to study the wind field around the ladder-type roof and the distribution characteristics of wind pressure under group layout,especially the wind pressure distribution of the key parts such as the front eaves of the roof and the turning points of the ladder.The interference factor IF of wind pressure coefficient is introduced to quantify the aerodynamic interference effects of surrounding buildings on wind pressure distribution by comparing the monomer situation.