龙卷风作用下两类屋面风荷载特性对比研究  

COMPARATIVE STUDY OF WIND LOAD CHARACTERRISTICS OF TWO TYPES OF ROOFS UNDERTHE EFFECT OF TORNADO

作　　者：朱志峰 李方慧[1] 袁中亚 于世龙 刘端宣 范佳红 ZHU Zhifeng;LI Fanghui;YUAN Zhongya;YU Shilong;LIU Duanxuan;FAN Jiahong(School of Civil Engineering,Heilongjiang University,Harbin 150086,China)

机构地区：[1]黑龙江大学建筑工程学院,哈尔滨150086

出　　处：《低温建筑技术》2023年第9期119-123,共5页Low Temperature Architecture Technology

摘　　要：为研究龙卷风风场中央的两类屋面低矮建筑风荷载特性,文中以计算流体动力学手段建立Ward型龙卷风发生装置,采用Realizable k-ε湍流模型实现对两类屋面模型的数值模拟研究。对比分析3种典型屋面坡角(15°、30°和45°)下两类屋面低矮建筑物风荷载特性。研究结果表明,建筑物位于龙卷风中心时,龙卷风作用下两类屋面均受负压,且风压呈中心对称分布;随着屋面坡角的增加,双坡屋面建筑物所受最大负风压系数由-0.49增大至-1.04,四坡屋面风压随坡角增加而增大现象不明显,最大负风压系数稳定在约-0.49;同时两类屋面建筑物顶部中央的漩涡分离,转移至两侧屋檐处,屋面的漩涡数量减少。龙卷风作用下两种屋盖对比研究中得出结论,相较双坡屋面四坡屋面在3种坡度下均可有效减低风荷载。In order to study the wind load characteristics of two types of low roof buildings in the center of the tornado wind field,this paper establishes a Ward-type tornado generating device by means of computational fluid dynamics,and adopted Realizable k-εturbulence model to realize the numerical simulation study of the two types of roof mod⁃els.The wind load characteristics of the two types of roof buildings are compared and analyzed under three typical roof slope angles(15°,30°and 45°).The results show that when the building is located in the center of the tornado,both types of roofs are subject to negative pressure under the tornado,and the wind pressure is symmetrically distributed in the center.With the increase of the slope angle of the roof,the maximum negative pressure coefficient of the gable roof building increases from-0.49 to-1.04.The increase of the wind pressure of the hip roof with the increase of the slope angle is not obvious,and the maximum negative pressure coefficient is stable at about-0.49.Meanwhile,the vortex at the top center of two types of building is separated and transferred to the eaves on both sides,and the number of vortex on the roof decreases.This comparative study of two types of roofs under tornado action concludes that wind loads can be effectively reduced at all three slopes as compared to a gable roof with a hip roof.

关 键 词：龙卷风 两类屋面 低矮建筑 数值模拟 

分 类 号：TU312[建筑科学—结构工程]