摘要
针对施工自立状态的矩形截面拱形斜钢桥塔的风振响应特性,该文开展了风洞试验研究,采用1∶50的气动弹性模型,在不同的风偏角β(0°~180°)下进行试验。试验结果表明:①在均匀流场下,当实桥风速达到60 m/s时,桥塔自立状态未发生驰振现象;②在均匀流场下,桥塔虽会出现顺桥向或横桥向的弯曲涡激共振,但该共振现象的塔顶位移幅值较小,基本不会对施工人员的舒适性和施工机械的安全造成不利影响;③在紊流场下,桥塔仅在75°风偏角下发生低速的横桥向弯曲涡激共振,相较于均匀流场,其涡激共振的塔顶位移幅值更低,说明紊流对涡激共振起到了抑制作用。该研究成果为拱形斜钢桥塔的设计和施工提供了参考依据。
This paper presented a wind tunnel experimental study on the wind-induced response characteristics of a rectangular-sectioned arch-shaped inclined steel bridge tower during the construction free-standing stage.A 1:50 scaled aeroelastic model was employed to conduct experiments at different wind yaw angles β(0°‒180°).The experimental results indicate:①under the uniform flow field,the tower in its free-standing state does not experience galloping when the bridge’s wind speed reaches 60 m/s;②under the uniform flow field,the tower exhibits bending vortex-induced vibrations(VIVs)along the bridge direction or transverse to the bridge direction.However,the amplitudes of the tower top displacements associated with these VIVs are relatively small,thereby posing minimal adverse effects on the comfort of construction personnel and the safety of construction machinery;③under the turbulent flow field,the tower only exhibits a low-speed bending VIV transverse to the bridge direction at a wind yaw angle of 75°.Compared to those of the uniform flow field,the amplitudes of the tower top displacements associated with the VIV are lower,indicating a suppressing effect of turbulence on VIVs.These research findings provide an essential reference for the design and construction of arch-shaped inclined steel bridge towers.
作者
徐培军
邓飞云
陈诗璇
张吉仁
XU Peijun;DENG Feiyun;CHEN Shixuan;ZHANG Jiren(Changsha Public Engineering Construction Center,Changsha,Hunan 410023,China;College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)
出处
《中外公路》
2025年第3期137-144,共8页
Journal of China & Foreign Highway
基金
长沙市政府采购研究项目(编号:CSCG-202107060066)。
关键词
拱形斜钢桥塔
风洞试验
气弹模型
涡激共振
二维绕流场
arch-shaped inclined steel bridge tower
wind tunnel test
aeroelastic model
vortex-induced vibration
two-dimensional flow field
