Stadium Multiple Arch Light Steel Cantilever Roof Wind Pressure Characteristics Research

With the long-span structure and the continuous development of steel structure,steel roof light weight,mild material advantages are widely used in large-scale stadium roof structure,because of its structure as a whole semi-open building,roof up and down the surface At the same time by the wind load,sensitive to the wind load response,and China’s current "building structure load specification"(GB50009-2012)and the relevant light steel structure specifications or procedures are lack of arch light steel cantilevered roof average wind pressure The description of the coefficient distribution and the normative value of the wind load body coefficient.In this paper,based on the basic theory of computational fluid dynamics,the numerical simulation method is used to study the surface air pressure distribution of the cantilevered cantilevered roofs.The main research work and achievements are as follows:(1)Based on the numerical model of the three-dimensional fluid wind field of the cantilevered roof of the low-rise building standard model(TTU),the experimental data of the TTU and the experimental data of the wind tunnel and the experimental data of the cantilevered roof wind tunnel are compared and analyzed respectively.Finally,a numerical simulation analysis model for cantilevered roof structure of stadium stands is established.(2)The finite element model of the cantilevered cantilevered roof of the stall with the arches is established,including the influence of the wind direction angle on the average wind pressure coefficient distribution,the wind velocity vector around the roof and the turbulence The effect of kinetic energy distribution.The results show that the average wind pressure coefficient of the roof surface under different wind direction angles is in the windward end.When the stadium is upwind to the wind,the absolute value of the wind pressure coefficient is the largest,and the roof should be taken around the roof to prevent the wind Load and damage.(3)The finite element expansion analysis of the three-dimensional fluid wind field of the cantilevered cantilevered roof of the stadium is carried out.The changes of the average windpressure coefficient of the roof surface are studied respectively by the inclination,influences.The results show that the increase of the inclination angle of the roof increases the average wind pressure coefficient on the upper surface of the roof,and the average wind pressure coefficient(absolute value)increases with the increase of the inclination angle,but the influence of the average wind pressure coefficient on the lower surface The change of the average wind pressure coefficient is not obvious;the change of the rear ventilation rate is the average of the lower surface of the roof The wind pressure coefficient has a great influence on the average wind pressure coefficient of the upper surface.In the actual project,in a certain range can reduce the inclination,increase the rear ventilation rate to reduce the roof by the impact of wind load,can effectively reduce the amount of steel.