龙卷风作用下拱形屋面风荷载特性数值模拟  

Numerical simulation of wind load characteristics of arch roof under tornado effect

作　　者：朱志峰 赵方锐 张舒涵 刘端宣 刘育硕 ZHU Zhifeng;ZHAO Fangrui;ZHANG Shuhan;LIU Duanxuan;LIU Yushuo(School of Civil Engineering,Heilongjiang University,Harbin150086,Heilongjiang,China)

机构地区：[1]黑龙江大学建筑工程学院,黑龙江哈尔滨150086

出　　处：《工程建设》2024年第8期15-19,49,共6页Engineering Construction

摘　　要：为提升建筑抗风设计的安全性,文章构建了Ward型龙卷风发生装置,运用Realizable k-ε湍流模型对龙卷风场进行模拟,并针对位于风场中央的拱形屋面低矮建筑进行了风荷载模拟研究。研究过程中,分析了不同矢跨比拱形屋面建筑物的风压分布,并考察了涡流比为0.2、0.5、1.5时,矢跨比为1/10的拱形屋面风压分布规律。结果表明:在静止龙卷风中心,拱形屋面承受负压,风压分布呈中心对称;矢跨比增加对风压增大的影响不显著;顶部中央漩涡分离并向两侧屋檐转移,屋面漩涡数量减少;随着涡流比增加,屋面风压呈现先增大后减小的趋势,为低矮建筑的抗风设计提供了参考。In order to enhance the safety of wind resistant design of buildings in this paper, based on the numerical simulation of Computational Fluid Dynamics(CFD),a Ward-type tornado generator is established, and the Realizable k-ε turbulence model is used to simulate the tornado field, and the simulation study is conducted to investigate the wind loads on the arch-roofed low-rise building located in the center of the tornado wind field.The wind pressure distribution of arch roof buildings with different sagittal span ratios was analyzed, and the wind pressure distribution law of the arch roof with sagittal span ratio of 1/10 is investigated under vortex ratios of 0.2,0.5,and 1.5.The results show that: when the building is located in the center of the stationary tornado, the arch roof is subjected to negative pressure under the action of the tornado, and the wind pressure is centrosymmetrically distributed;with the increase of the vector-span ratio the increase of wind pressure on the arch roof is not obvious;at the same time, the vortex in the center of the top of the building separates and transfers to the eaves of the two sides, and the number of vortices on the roof decreases;with the increase of the vortex ratio, the wind pressure on the roof of the arch low-rise building in the central part of the tornado wind field increases firstly and then decrease.

关 键 词：风压系数 龙卷风 拱形屋面 低矮建筑 涡流比 数值模拟 

分 类 号：TU973.23[建筑科学—结构工程]