双面广告牌体型系数的风洞测力试验研究  

Study of Wind Coefficient of Double-sided Billboard from Wind Tunnel Test

作　　者：黄洪量 汪大海[1] Huang Hongliang;Wang Dahai(School of Civil Engineering and Architecture,Wuhan University of Technology,430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,430070

出　　处：《特种结构》2022年第6期43-50,共8页Special Structures

摘　　要：随着城市化进程的快速发展,大型户外广告牌结构愈发普遍且外形多样。作为一类典型的风敏感结构,其强风导致的破坏及引发的次生灾害也逐渐引起了城市防灾管理的关注。本文通过刚性模型的风洞测力试验,对广告牌结构体型系数展开了系统的研究。着重考察了不同外形参数的双面广告牌顺风向、横风向、水平合力以及扭矩的体型系数随风向角的变化规律。分析了结构的间隙比、高宽比、面板张角和侧面开敞封闭等气动外形变化对体型系数的影响。研究表明,广告牌结构的气动外形的变化对其顺风、横风向、水平合力和扭矩的体型系数影响不可忽视。面板张角的增大引起整体体型系数的增大;面板端部封闭后,在最不利风向角下,最大顺风向体型系数略有减小,各横风向体型系数明显增大,扭矩系数有显著减小。宽高比和间隙比减小时,体型系数随之减小,且间隙比对体型系数的影响更加明显。研究对风荷载设计规范中体型系数取值的修订完善提供了重要的试验依据。With the rapid development of urbanization,large outdoor billboard structures of various shapes are becoming more and more common.As a typical wind-sensitive structure,the damage and secondary hazards caused by strong winds have gradually attracted the attention of urban disaster prevention management.In this paper,the wind coefficient of the billboard structures is systematically studied through the wind tunnel force test of the rigid model.The correlations of wind coefficients of double-sided billboards with different shape parameters in downwind direction,crosswind direction,horizontal resultant force and torque with wind angle are investigated.The influence of aerodynamic shape profile such as clearance ratio,height to width ratio,panel angle,and side opening and closing on the wind coefficient is analyzed.The study shows that the influence of aerodynamic shape profile on the average wind coefficient in downwind direction,crosswind direction,horizontal resultant force and torque cannot be ignored.An increase in the panel angle results in an increase in the overall wind coefficient.When the panel end is closed and at the most unfavorable wind angle,the maximum downwind wind coefficient decreases slightly,the side wind coefficient increases significantly,and the torque coefficient decreases significantly.When the height to width ratio and clearance ratio decrease,the body shape factor decreases,and the effect of clearance ratio on the body shape factor is more obvious.This study provides an important test basis for the revision and improvement of the value of the body type coefficient in the wind load design code.

关 键 词：户外广告牌 风洞试验 刚性模型 体型系数 

分 类 号：TU312.1[建筑科学—结构工程]