摘要
设计并制作了圆形马鞍面大跨屋盖结构缩尺模型,利用冲击射流装置展开下击暴流模拟试验,根据不同径向距离和风向角设计试验工况,得出屋盖风压系数,探究了不同径向距离和风向角下圆形马鞍面屋盖的风压分布规律。通过改变建筑宽度设计椭圆形马鞍面屋盖,并分析了两种屋盖风压的异同点。得出结论如下:(1)圆形马鞍面屋盖的高点连线上的最大风压随径向距离的增加先增加后减小,在1.25D时达最大,其风压系数为-0.81;(2)风向角对圆形马鞍面低点区域的风压影响很大,当来流正对低点区域时,迎风面风压增长较快,且变化梯度很大;(3)椭圆形马鞍面屋盖受建筑物狭长形态的影响,其高点连线上距屋盖中心1/3L处及低点迎风区的测点风压略大于圆形,结构设计时需对这些区域进行加强。
A scale model of a large span structure with a circular hyperbolic-paraboloid roof was designed and made,and an impinging jet device was used to simulate the downburst. The test was designed to obtain the roof wind pressure coefficient and explore the influence of radial distance and wind direction angle on the wind pressure of circular hyperbolic-paraboloid roof. Then,by changing the width of the building,the oval hyperbolic-paraboloid roof was designed and made under the same conditions. The similarities and differences of wind pressure on the two roofs were compared and analyzed. The conclusions are as follows:(1)The maximum wind pressure values of the high points diagonal of the circular hyperbolic-paraboloid roof first increase and then decrease with the increase of the radial distance. When the wind pressure is 1.25D,the wind pressure reaches the maximum,and the wind pressure coefficient is-0.81.(2) Wind direction angle has a great influence on the wind pressure of low point areas of circular hyperbolic-paraboloid roof.When airflow frontal hits the low point area,the wind pressure on the windward area increases rapidly,and the change gradient of the wind pressure is very large.(3) Due to the difference of lengths and widths,the wind pressure of the area which is 1/3L from roof center on high point line and the low point areas of the oval hyperbolic-paraboloid roof is slightly greater than that of the circular hyperbolic-paraboloid roof.These areas need to be strengthened during structural design.
作者
褚云朋
孙鑫晖
李明
姚勇
黄汉杰
CHU Yun-peng;SUN Xin-hui;LI Ming;YAO Yong;HUANG Han-jie(College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;China Aerodynamics Research and Development Center,Mianyang 621010,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2022年第8期1826-1833,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51608245)
四川省科技厅基础研究项目(2019YJ0322)。
关键词
结构工程
下击暴流
马鞍面屋盖
风洞试验
风压特性
structural engineering
downbrust
hyperbolic-paraboloid roof
wind tunnel test
wind pressure characteristics
