（1 长安大学建筑工程学院， 西安 710061； 2 长安大学理学院， 西安 710061）

［摘要］为研究对风雪荷载敏感的平面腹部凸出双坡轻型房屋屋面的风致雪漂移规律，基于计算流体动力学原理和两相流理论，运用CFD软件进行数值建模，对立方体及高低屋面风致雪漂移分布进行数值模拟，并与实测数据进行对比，分析与探讨参数选取及边界条件设置。在此基础上，以风向角（0°，45°，90°，135°，180°）、风速（5，7.5，10，12.5，15m/s）、屋面坡角（20°，31°，40°）为分析参数，分别对不含凸出部分的双坡房屋、凸出部分长短边对应占主体长短边尺寸的1/2及1/4的2种平面腹部凸出双坡房屋，共计3种房屋屋面进行前期工况试算。在此基础上，综合雪漂移分布规律，为反映屋面各部分积雪分布特性进一步对房屋屋面进行细致分区，共模拟195种工况的风致雪漂移运动，得到各工况下房屋屋面风致雪漂移分布规律及可供抗雪设计的各分区积雪分布系数。研究表明：对房屋屋面进行分区，能更好地反映积雪沿屋脊长度方向的分布特性，分区后屋面中部的积雪分布系数值超过不分区约9%；腹部凸出区域对主体结构影响明显，若仅参考单跨双坡屋面积雪系数进行设计，存在安全隐患，设计中应予以注意。

［关键词］双坡房屋；腹部凸出；风致雪漂移；积雪分布

中图分类号：TU312+.1文献标识码：A文章编号：1002-848X(2021)03-0062-09

Study on wind-induced snow drift of the flat abdomen protruding double-slope house roof

YAN Weiheng1, ZHANG Wen1, WU Donghong2

(1 School of Civil Engineering, Chang′an University, Xi′an 710061, China；2 School of Sciences, Chang′an University, Xi′an 710061, China)

Abstract:In order to study the wind-induced snow drift law of the flat abdomen protruding double-slope light house roof sensitive to wind and snow load, based on the computational fluid dynamics principle and the two-phase flow theory, the CFD software was used for numerical modeling, and the numerical simulation on the distribution of wind-induced snow drift on cube and high and low roof was carried out and compared with measured data to analyze and discuss the parameter selection and boundary condition setting. On this basis, the wind direction angles (0°, 45°, 90°, 135°, 180°), wind speed (5, 7.5, 10, 12.5, 15m/s), and roof slope angle (20°, 31°, 40°) were used as analysis parameters. Respectively,  the double-slope houses without convex parts and two kinds of plane abdomen convex double-slope houses, which the long and short sides of the convex parts correspond occupying 1/2 and 1/4 of the length and short side of the main body, a total of three types of house roofs were tested for preliminary working conditions. On this basis, considering the comprehensive distribution law of snow drift, in order to reflect the distribution characteristics of the snow on each part of the roof, the roof of the house was further divided into details, and a total of 195 kinds conditions of wind-induced snow drifting motions were simulated. The distribution law of wind-induced snow drift on the roof of the house under each working conditions and the snow distribution coefficient of each zone available for snow resistance design were obtained. The research shows that the partitioning of the roof of the house can better reflect the distribution characteristics of the snow along the length of the ridge. The distribution coefficient of snow in the middle of the roof after partitioning is more 9% than that of the non-partition; the abdomen protruding area has obvious influence on the main structure. If the design only refers to the snow coefficient of the single-span double-slope house, there are safety hazards, and attention should be paid in the design.

Keywords:double-slope house;abdomen protruding;wind-induced snow drift;snow distribution

*陕西省自然科学基金项目（2004E204），中央高校科研专项资金项目（创新团队项目2013G3284016）。

作者简介：颜卫亨，学士，教授，Email: yanwh@chd.edu.cn。