摘要
以一座已建的大跨悬索桥为工程依托,基于现场实测与计算流体动力学(Computational Fluid Dynamics,CFD)方法研究Π形加劲梁断面气动外形对桥面高度处实测风参数的影响,并提出实测风攻角的修正方法.进行为期5个月的桥面高度处风速和风攻角现场实测,分析风参数沿桥轴线的分布规律,并比较了桥面高度处迎风侧与背风侧风速仪实测的风速和风攻角;采用计算流体动力学方法模拟气流流经静止加劲梁断面的流场,研究来流风攻角和风速对风速仪安装在加劲梁不同位置处风参数的影响;结合数值模拟结果,通过函数拟合得到Π形加劲梁断面风速仪实测风攻角的修正公式.结果表明:实测风速在大桥主跨范围内较为接近,且边跨风速相较于主跨风速偏小;现场实测得到的迎风侧风攻角明显大于背风侧,两侧风速基本一致;迎风侧与背风侧的风参数数值模拟结果与现场实测具有一致性,主梁绕流对距主梁20 m范围内的风攻角监测结果均存在一定影响.通过本文建立的风攻角修正方法,可以根据迎风侧风攻角的实测值得到较为合理的风攻角修正结果.
Taking an existing large-span suspension bridge as the engineering background,the influence of the aerodynamic contour of aΠ-shaped stiffening girder on the measured wind parameters at the main girder level was studied,and a correction method for the measured wind angle of attack(AOA)was proposed based on the field mea⁃surement and Computational Fluid Dynamics(CFD)method.Moreover,the field measurements of wind speeds and AOAs at different measurement points on theΠ-shaped stiffening girder were carried out for five months.The distri⁃bution of wind parameters along the bridge axis was analyzed,and the wind speeds and the wind AOAs measured by the anemometers on the windward and leeward sides at the stiffening girder level were compared,respectively.Fur⁃thermore,the CFD method was utilized to simulate the flow field of the stationary girder to investigate the influence of incoming wind speeds and wind AOAs on the wind parameters measured by the anemometer installed at different positions of theΠ-shaped stiffening girder.Additionally,a correction formula for the wind AOAs measured at the windward side of theΠ-shaped stiffening girder was proposed based on the numerical simulation.The results show that the measured wind speeds are relatively close within the main span while those are lower at the side span.The wind AOAs measured on the windward side are significantly larger than those on the leeward side of the girder,while the wind speeds are almost the same on both sides.The numerical simulation results of the wind parameters mea⁃sured on the windward and leeward sides are consistent with the measured results,and the flow around the girder has a specific influence on the wind AOAs within 20 m of the girder.Via the wind AOAs data measured on the windward side,the rational wind AOAs results can be obtained based on the correction method proposed in this study.
作者
刘志文
魏子然
何法伟
刘曙光
万田保
陈政清
LIU Zhiwen;WEI Ziran;HE Fawei;LIU Shuguang;WAN Tianbao;CHEN Zhengqing(Key Laboratory for Wind and Bridge Engineering of Hunan Province(Hunan University),Changsha 410082,China;State Key Laboratory of Bridge Engineering Safety and Resilience(Hunan University),Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第11期1-13,共13页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52178475,51778225)。
关键词
桥梁工程
大跨悬索桥
Π形加劲梁
风参数
现场实测
计算流体动力学
修正方法
bridge engineering
large-span suspension bridge
Π-shaped stiffening girder
wind parameters
field measurement
computational fluid dynamics
correction method
作者简介
通信联系人:刘志文(1975-),男,山西阳高人,湖南大学教授,工学博士,E-mail:zhiwenliu@hnu.edu.cn。
