Staggered Arrangement Wind-Induced Interference Effect Research Of Folding Reticulated Shell Tents

Folding reticulated shell tent belongs to typical wind sensitive low rise buildings, which is widely used in civil and military fields. It’s usually arranged in groups when it comes to emergency and camping tents. However, current Chinese design specification doesn’t state the wind-induced interference effects on low-rise buildings, although foreign design specification has some rules linked with that, there is no clear approach to obtain exact value. Regulations lag behind the application, which leads to no foundation and some security risks when designing and using folding reticulated shell tents. Therefore, considering the condition of structure safety, actual site, ventilation and sunshine, and to make group design and layout more reasonable, it is necessary to develop some studies on characteristics of wind pressure distribution and wind-induced interference effects of different layout folding reticulated shell tents, which can avoid amplification effect use shade effect, and improve group layout and provide theoretical basis for the tent design and application safety.The study is based on fluid dynamics and atmospheric boundary layer theory. Tunnel test of monomer tent and FLUENT software are also used in order to discuss and analyze key techniques and parameters, such as turbulence models, discrete format and solving algorithms,which establishes numerical wind tunnel of staggered layout tents. Analysis parameters including the arrangement form, the wind angle, horizontal and vertical density coefficient are involved in numerical wind tunnel to simulate wind pressure, which are then used to study the distribution properties on the surface of target tent in 96 kinds of group working condition.The result includes the critical distance of ignoring interference effect between the group tents and wind pressure changing regulation of single tent. In light of it, wind angle and horizontal and vertical density coefficient are used as parameters to analyze the distribution of wind pressure on each tent in 6 layouts(staggered and regular layout), interference factors and shape coefficient which should be applied for group tents are then obtained to provide theoretical basis for folding reticulated shell tent community design. The result shows that the wind interference effects of staggered layout folding reticulated shell tent can not be ignored and 90° is the most unfavorable wind direction, which should be paid more attention when it is designed and used.