稳态雷暴冲击风场下矩形梁风荷载特性试验研究  

Experimental study on wind load characteristics of rectangular beam under steady thunderstorm downburst wind field

作　　者：胡朋[1] 龙佳慧 胡广德 陈飞[1] 陈婉婷 韩艳[1] HU Peng;LONG Jiahui;HU Guangde;CHEN Fei;CHEN Wanting;HAN Yan(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;International Institute of Engineering,Changsha University of Science&Technology,Changsha 410114,China;Henan Provincial Communications Planning&Design Institute Co.,Ltd.,Zhengzhou 450015,China;The Fourth Engineering Co.,Ltd.of China Railway 11th Bureau Group Corporation Limited,Wuhan 430061,China)

机构地区：[1]长沙理工大学土木与环境工程学院,湖南长沙410114 [2]长沙理工大学国际工学院,湖南长沙410114 [3]河南省交通规划设计研究院股份有限公司,河南郑州450015 [4]中铁十一局集团第四工程有限公司,湖北武汉430061

出　　处：《交通科学与工程》2025年第2期31-43,共13页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(52178451、52178452);湖南省自然科学基金项目(2024JJ2002、2024JJ3002);国家级大学生创新训练计划项目(S202310536057)。

摘　　要：【目的目的】考察稳态雷暴冲击风场对大跨度桥梁风特性及风荷载的影响。【方法方法】基于雷暴冲击风试验装置模拟了稳态雷暴冲击风场,以典型矩形梁断面为研究对象,探究了稳态雷暴冲击风场对矩形梁风压系数及风荷载特性的影响规律。【结果结果】所采用的雷暴冲击风试验装置能够产生精度较高的雷暴冲击风场,具备模拟稳态雷暴冲击风场的条件。在半径r=0.6D_(jet)~2.75D_(jet)(D_(jet)为喷嘴直径)范围内,雷暴冲击风水平风速的竖向风剖面整体呈“鼻子”状。不同高度处雷暴冲击风的风攻角大多处于负攻角状态,且在一定高度范围内,雷暴冲击风的风攻角绝对值随着高度的增加而增加。受喷嘴下方高气压的影响,当矩形梁位于喷嘴正下方时,矩形梁断面整体表现为正压;随着径向距离的增加,雷暴冲击风风速逐渐由竖向演变为以水平方向为主,矩形梁表面风压逐渐变小。在r=0~2.0D_(jet)范围内,矩形梁升力和阻力的变化最为剧烈,且在该范围内出现最大值;不同离地高度的矩形梁的升力和阻力随径向位置的变化趋势基本相同。【结论结论】研究成果可为雷暴冲击风作用下桥梁等钝体结构的风荷载分布提供参考。[PurposesPurposes]The paper aims to investigate the influence of the steady thunderstorm downburst wind field on the wind characteristics and wind loads of long-span bridges.[MethodsMethods]The steady thunderstorm downburst wind field was simulated with a thunderstorm downburst wind simulator.Taking a typical rectangular beam section as the research object,the study explored the influence of the steady thunderstorm downburst wind field on the wind pressure coefficient and wind load characteristics of the rectangular beam.[Findings Findings]The thunderstorm downburst wind simulator used in this study can generate thunderstorm downburst wind field with high precision,meeting the conditions for simulating the steady thunderstorm downburst wind field.Within the scope of the radius r from 0.6D_(jet) to 2.75D_(jet)(D_(jet) is nozzle diameter),the vertical wind profile of the horizontal wind speed of the thunderstorm downburst wind overall exhibits a shape of nose.The wind attack angles of the thunderstorm downburst wind at different heights are mostly negative,and within a certain height range,the absolute values of the wind attack angles increase with increasing height.Due to the influence of high air pressure below the nozzle,when the rectangular beam is located directly below the nozzle,the entire rectangular beam section exhibits positive pressure.As the radial distance increases,the thunderstorm downburst wind speeds gradually evolve from vertical direction to primarily horizontal direction,and the wind pressures on the surfaces of the rectangular beam gradually decrease.Within the range of r from 0 to 2.0D_(jet),the changes in the lift and drag forces of the rectangular beam are the most drastic,and the maximum values appear within this range.The trends of the lift and drag forces of the rectangular beam at different heights from the ground vary similarly with changes in radial position.[ConclusionsConclusions]The research findings can provide references for the wind load distributions of bluff body structures su

关 键 词：稳态雷暴冲击风 矩形梁 风场特性 风压系数 气动力 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]