Research Of Wind Interference Effects On The Gable-Roofed Factory Buildings

As the demand of the industrial products and the progress of construction technology, the span of new factory is bigger than ever before. Nowdays most of the factory building construction are distributed in groups and influenced by wind-induced interference effects on wind loads of roof. Therefore,this paper inducted a numerical simulation experiment to analysis the wind loads distribution of gable-roof and he main research content is as follows:First and foremost, numerical simulation comparisons of different meshing types and different turbulence models for the SSB (the Silsoe Structure Building) standard model were conducted, and the data obtained were subsequently compared with the measured ones, thus the meshing type and turbulence model suitable for the flow separation of the long-span building roof in this paper were eventually selected. It was experimentally concluded that a more accurate simulation result could be obtained through the employment of the multi-basin unstructured meshes; additionally, the separated flow could be predicted through the RNG k-ε turbulence model in conjunction with the standard wall function.Secondly, based on the analysis above, the influences of multiple parameters (the slope angle, the length-width ratio and the height-span ratio) as well as the wind direction on the wind pressure distribution of the industrial building roof were investigated through the FLUENT software. As a result, when the slope angle was smaller than15°, it exhibited little effect on the overall roof pressure distribution, but larger effect on those of local positions, such as the eave and the roof ridge; when the length-width ratio reached the critical value (2.5), the wind pressure distribution of the whole roof gently varied, until there was no changes; and when the height-span ratio achieved0.7, the minimum of the wind pressure distribution could be obtained, which indicated the most unfavorable condition. Moreover, the wind direction was the influential factor of the highest degree, and for the overall distribution of large-span roofs, the wind direction angle of0°as the worst condition.Finally, a standard model was adopted to conduct the interference impact analysis of two serially-arranged equal-sized buildings with different spacings, two serially-arranged unequal-sized buildings with fixed spacing, three serially-arranged equal-sized buildings as well as four axisymmetrically-arranged buildings. It was eventually indicated that there existed the critical wind direction angle of αcri and the critical disturbance distance Scri. When the wind direction angle α<αcri, the interference effect was mostly the weakening effect, otherwise the enhancement effect. When the building spacing was smaller than the critical interference one, the interference enhancement effects may overlay for the serially-arrangement interfering buildings, while the enhancement effect would be inhibited by the staggered arrangement of the interfering buildings.