不同宽高比宽幅双箱结合梁的气动力特性及流场机理研究  

Study on aerodynamic force characteristics and flow field mechanism of wide-width double-box composite beams with different aspect ratios

作　　者：张晓 赵仁燕 张德旺 刘小兵 李慧君[4] ZHANG Xiao;ZHAO Renyan;ZHANG Dewang;LIU Xiaobing;LI Huijun(Zhengzhou Development Investment Group Co.,Ltd.,Zhengzhou 450000,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]郑州发展投资集团有限公司,郑州450000 [2]石家庄铁道大学土木工程学院,石家庄050043 [3]河北省风工程与风能利用工程技术创新中心,石家庄050043 [4]中铁二院工程集团有限责任公司,成都610031

出　　处：《振动与冲击》2025年第8期315-324,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52078313);中央引导地方科技发展资金项目(236Z5407G)。

摘　　要：以国内某宽幅双箱结合梁桥为背景,采用风洞试验和数值模拟相结合的方法对不同宽高比宽幅双箱结合梁的气动力特性及流场机理进行了研究。首先,在实桥宽高比为12.8时选取-10°~10°,间隔为2°,共11个风攻角进行研究。然后,在0°风攻角(水平来流方向)下,结合实际工程中双箱结合梁宽高比的取值范围,选取六种不同大小的宽高比(9.0、11.0、12.8、15.0、17.0和19.0)进行研究。结果表明:在实桥宽高比下,随风攻角由-10°变化到10°时,双箱结合梁的阻力系数先减小后增大;升力方向由向下变为向上,升力系数绝对值先减小后增大;扭矩方向由逆时针变为顺时针,且顺时针的扭矩系数先增大后减小。当风攻角为0°时,随着结合梁宽高比的增大,阻力系数先不变后增大;升力方向由向下变为向上,升力系数绝对值先减小后增大;扭矩系数逐渐减小。针对0°风攻角下不同宽高比的宽幅双箱结合梁,给出了三分力系数的计算公式,可为实际工程中宽幅双箱结合梁的风荷载设计提供参考。Based on a domestic wide-width double-box composite beam bridge,the aerodynamic characteristics and flow field mechanisms of wide-width double-box composite beams with different aspect ratios were investigated,using a combined approach of wind tunnel test and numerical simulation in this study.Firstly,a total of eleven wind attack angles ranging from-10°to 10°with an interval of 2°were selected for the investigation under an aspect ratio of the actual bridge of 12.8.Subsequently,focusing on the 0°wind attack angle(horizontal flow direction),six different aspect ratios(9.0,11.0,12.8,15.0,17.0,and 19.0)were chosen for analysis,based on the range observed in practical engineering applications for double-box composite beams.The results indicate that under the aspect ratio of the actual bridge,as the wind attack angle varies from-10°to 10°,the drag coefficient of the double-box composite beam first decreases and then increases;the direction of lift force changes from downward to upward,with the absolute value of the lift coefficient first decreasing and then increasing;the direction of torque changes from counterclockwise to clockwise,and the clockwise torque coefficient first increases and then decreases.At a wind attack angle of 0°,as the aspect ratio of the composite beam increases,the drag coefficient remains constant first and then increases;the direction of lift force changes from downward to upward,with the absolute value of the lift coefficient first decreasing and then increasing;and the torque coefficient gradually decreases.For the wide-width double-box composite beams with different aspect ratios under 0°wind attack angle,a calculation formula for the three-component force coefficient was presented,which can provide a reference for the wind load design of wide-width double-box composite beams in practical engineering.

关 键 词：宽幅双箱结合梁 风洞试验 数值模拟 气动力特性 流场机理 宽高比 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]