Study On The Wind Pressure Distribution Characteristics And Shape Optimization Of Landing Hipped House

Landing hipped camping house has advantages of folding conveniently, high recycling rate, high mobility and so on, so it is widely used in civilian and military fields. Low lighting landing hipped house is in the near earth region with great changes of wind speed and high turbulence intensity of the atmospheric boundary layer; and in view of the overall quality light of this kind structure, it belongs to wind sensitive structures. So wind load is often the control load in the structural design. While the design code at home and abroad haven,t given the shape coefficient of landing hipped house. When the design of wind resistance can only be used the shape coefficient of double-sloping roof house under the wind direction of 0°and 90° which are not taken into account the change of massing house, let alone doing the shape optimization based on wind pressure distribution characteristics, so it is necessary to study the wind-resistant design of this kind of building and structure shape optimization.To study the distribution of wind pressure on the surface of landing hipped house under wind loads and reasonable aerodynamic configurations, according to the usage and function, the paper designs 27 different massing houses,based on the basic principle of computational fluid dynamics and atmospheric boundary layer, combined with wind tunnel experiment results, the paper establishes numerical wind tunnel for landing hipped house by using the method of fluid dynamics and the software FLUENT to research type and generation technology of mesh and determine the selection of discrezation scheme, calculation method, turbulent flow model and other key parameters.Considering landing slope angle, roof slope angle, height-width ratio and wind direction as parameters, the distribution characteristics of wind pressure on the house surface under 81 working conditions by using numerical wind tunnel, and gets the surface wind pressure distribution regularity of houses and Shape coefficient of all regions are obtained. The optimal distribution relationship between massing house and wind pressure distribution on surface as the optimization goal. Based on this, considering minimizing the standard deviation of shape coefficient, closing to the difference extremum of shape coefficient in each region and reducing the relative change rate of difference value as optimal calculate indicators. Then, the wind resisting aerodynamic contour(or reasonable shape) was got.Additionally initial forms of house and wind-induced response of the optimal solutions were compared qualitalively and quantitatively, and gets the aerodynamic configurations(reasonable size) of good wind-resistant performance.The results indicate that compared to the wind tunnel experiment, numerical wind tunnel can more accurately research the optimization method is applicable to the landing hipped roof house for its wind resistance performance based on the fundamental research is conducted by using numerical simulation, and it provides an effective method for the design of new house.