摘要
为研究平面腹部凸出双坡房屋表面风致雪漂效应,基于计算流体动力学原理和两相流理论,运用ICEM CFD软件进行数值建模.采用FLUENT软件中的Mixture多相流模型对立方体及高低屋面风致雪漂情况进行数值模拟,与实测数据进行对比分析,建立数值风洞的参数设置及边界条件.在此基础上,以风速为5m/s、7.5m/s、10m/s、12.5m/s、15m/s,风向角为0°、45°、90°、135°、180°,以及平面腹部凸出的5种相对尺寸为分析参数,对125种工况进行数值风洞计算,得到房屋表面风致雪漂分布规律,计及其分布规律的不均匀性,对其表面进行分区,得到可供抗雪设计的各分区积雪分布系数.研究表明: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,设计人员应予以注意;风致雪漂在房屋表面明显分布不均,因此对风雪敏感结构,应对其表面进行分区,以揭示其不利积雪分布情况.
In order to study wind-induced snow drift effect on the surface of a house with two slopes protruding from a flat abdomen,based on computational fluid dynamics principle and two-phase flow theory,the ICEM CFD software was used to conduct the numerical modeling.The Mixture multiphase flow model in the FLUENT software was adopted to carry out a numerical simulation of snow conditions around the cube.The simulated data was compared with the measured data,and numerical wind tunnel parameter and boundary condition were established.On this basis,numerical wind tunnel for 125 kinds of working conditions is calculated,given the wind speed of 5 m/s,7.5 m/s,10 m/s,12.5 m/s and 15 m/s,the wind angle of 0°,45°,90°,135°,180°,and flat belly bulge of 5 kinds of relative size as analysis parameters.The wind-induced surface distribution of snow drift was obtained.Considering the distribution nonuniformity of snow,the surface was partitioned,and snow distribution coefficient of each partition was obtained.The study shows that the protruding area of abdomen has obvious influence on the main structure.If only the snowpack coefficient of single span and double slope roof is taken into consideration,there may be safety hidden danger,and the designer should pay attention to it.The distribution of wind-induced snow drifts on the surface of the house is obviously uneven,so it should be divided into sections for the snow-sensitive structure to reveal the adverse snow distribution.
作者
颜卫亨
张雯
王西凤
吴东红
YAN Wei-heng;ZHANG Wen;WANG Xi-feng;WU Dong-hong(School of Civil Engineering,Chang’an University,Shanxi 710061,China;School of Sciences,Chang’an University,Shanxi 710061,China)
出处
《空间结构》
CSCD
北大核心
2020年第2期40-48,共9页
Spatial Structures
基金
总后建筑工程研究所研究基金项目
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).
关键词
双坡房屋
腹部凸出
风致雪漂
积雪分布
double-slope house
protruding abdomen
wind-induced snow drift
snow distribution
作者简介
颜卫亨(1958—),男,贵州人,教授,主要从事结构工程教学与研究.E-mail:yanwh@chd.edu.cn
