单跨单坡屋面积雪分布系数分析  

Analysis of distribution factor of snow pressure of building with single-span and single-slope roof

作　　者：汪青杰[1] 张延年[2] 蒋坤[2] 

机构地区：[1]沈阳建筑大学理学院,辽宁沈阳110168 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《自然灾害学报》2015年第3期184-189,共6页Journal of Natural Disasters

基　　金：国家"十二五"科技支撑计划项目(2011BAJ08B04);国家质检公益性行业科研专项(201210040);重庆市科技计划项目(CSTC2012jj A30007);沈阳市科技计划项目(F12-271-4-00)

摘　　要：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 reflect snow distribution actually,provide reasonable distribution factor of snow pressure of single-span and single roof and improve disaster-resistant capability,the field survey of snow coverage distribution of building with single-span and single-slope roof was carried out,and the problems about choosing value of distribution factor of snow pressure in loading code for design of building structures were analyzed. The numerical models of wind-induced snow accumulation of building with different roof sloping angle of 25°,30°,35°,40°and 45°,when low facades or high facades face the wind,were set up with FLUENT software. The results show that there is more accumulated snow on both sides and lower half portion of the roof,and there is less accumulated snow on the upper half portion of the roof. The sloped angles have less impact on wind velocity and angle when low facade faces the wind. The range of swirl covers the whole area behind high facades when high facade faces the wind. The stable snow coverage cannot be formed on the upper portion of roof because swirl increases with the sloped angle increasing. The snow distribution is more uneven than that in loading code for design of building structures,and the distribution factors of snow pressure are suggested by analyses.

关 键 词：单跨单坡屋面 屋面积雪分布系数 现场调查 雪漂移 数值模拟 计算流体动力学 

分 类 号：TU312.1[建筑科学—结构工程]