摘要
下击暴流是一种破坏力极强的极端天气,会对建筑物产生巨大破坏。为探究下击暴流对大跨结构屋盖的影响,利用计算流体力学(CFD)进行数值模拟,以济宁北站为原型探究风向角、径向距离以及云层移动速度对屋盖风压的影响。研究结果表明:济宁北站上屋盖在下击暴流的作用下整体处于负风压作用,且最大负风压位置出现在屋盖迎风区域。济宁北站的屋盖迎风面前缘风压变化梯度很大,最大风压出现在风向角为0°时的屋盖前缘,其最大负风压系数可以达到-2.5左右。济宁北站屋盖的最大负风压出现在径向距离为1.25Djet附近,其上屋盖的背风区受径向距离的影响较小。喷口的移动对屋盖迎风区前缘的负风压产生了增强效果。
Downbursts are extremely destructive weather events that can cause massive damage to build-ings.In order to investigate the influence of downburst on the roof of long-span structures,CFD was used to conduct numerical simulations,and Jining North Railway Station was taken as the prototype to explore the influence of wind angle,radial distance,and moving speed of cloud layer on the roof wind pressure.The results showed that,the upper roof of Jining North Railway Station was under negative wind pressure affect-ed by the action of downburst,and the maximum negative wind pressure occurred in the windward area of the roof.The maximum wind pressure appeared at the front edge of the roof when the wind angle was 0°,and its maximum negative wind pressure coefficient could reach about-2.5.The maximum negative wind pressure of the roof of Jining North Railway Station occurred near the radial distance of 1.25Djet,and the leeward area of the upper roof was less affected by the radial distance.The movement of the jet enhanced the negative wind pressure at the windward area of the roof.
作者
李伟
庄新龙
孙宇
赵玉岐
许方辉
孙鑫晖
张营营
LI Wei;ZHUANG Xinlong;SUN Yu;ZHAO Yuqi;XU Fanghui;SUN Xinhui;ZHANG Yingying(The First Company of China Eighth Engineering Bureau Ltd.,Jinan 250100,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《工业建筑》
2024年第7期120-127,共8页
Industrial Construction
关键词
下击暴流
风压特性
济宁北站
风向角
径向距离
downburst
wind pressure characteristics
Jining North Railway Station
wind angle
radial dis-tance
