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为真实反映单跨单坡屋面的积雪分布情况,给出较为合理的积雪分布系数,通过单跨单坡屋面积雪现场调查,分析了《建筑结构荷载规范》中屋面积雪分布系数的取值问题。采用FLUENT软件分别建立了坡度角为25°,30°,35°,40°,45°和50°的单跨单坡屋面的低立面和高立面迎风的风致积雪分析模型。分析表明,在屋面两侧和下坡处积雪较多,上坡处积雪相对较少。低立面迎风时,坡度角的变化对屋面风速大小与角度的影响都较小;高立面迎风时,涡流范围覆盖整个高立面后方区域。涡流随着屋面坡度角的增大而逐渐增大,因而屋面上部不易形成稳定的积雪带。与《建筑结构荷载规范》相比,屋面积雪分布存在明显的差异,通过分析给出了单跨单坡屋面积雪分布系数的建议。
In order to truly reflect the snow distribution of single-span single-slope roof, a more reasonable coefficient of snow distribution is given. According to the scene investigation of single-slope single-slope roof snow, the distribution coefficient of roof snow in “Building Structure Load Specification Value problem. Using FLUENT software, wind-induced snow accumulation models of single-span and single-slope roofs with slope angles of 25 °, 30 °, 35 °, 40 °, 45 ° and 50 ° were established. Analysis shows that there is more snow on both sides of the roof and on the downslope, and less snow on the uphill. When the windward angle is low, the change of slope angle has little influence on the wind speed and the angle of the roof. In the windward upwind, the swirl range covers the whole area of the rear of the high elevation. The eddy current increases with the increase of roof slope angle, so the upper part of the roof is not easy to form a stable snow belt. Compared with ”Load Code of Building Structure", there is a significant difference in roof snow distribution, and the suggestion of snow distribution coefficient of single-span single-slope roof is given through analysis.