基于测压风洞试验的钢桁梁上列车二维气动导纳研究  

2D aerodynamic admittance of train on steel truss girder based on pressure-measuring wind tunnel tests

作　　者：段青松 马存明[2] DUAN Qingsong;MA Cunming(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 621000,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]西南交通大学土木工程学院,成都621000

出　　处：《振动与冲击》2024年第9期43-49,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(520191258);西南科技大学自然科学基金(21ZX7148);风工程四川省重点实验室开放课题基金(WEKLSC202302)。

摘　　要：基于节段模型测压方法,建立了列车二维气动导纳的识别方法。在紊流场风洞试验中,获取了0°攻角时钢桁梁上列车抖振力的展向相关性;识别了钢桁梁上列车中车的三维气动导纳,探究了钢桁梁上列车中车三维气动导纳与二维气动导纳的关系。可知,随无量纲折减频率及展向间距的增大,抖振力的展向相关性逐渐减小,列车抖振力展向相干函数可用Jakobsen模型较好地拟合。当k_(1)B/2小于0.3时,二维气动导纳值为1,三维气动导纳会明显低估列车的气动导纳值。当k_(1)B/2大于0.3时,三维气动导纳会明显地高估二维气动导纳函数值,且随着折减频率的增大,气动导纳值减小。最后,给出了列车二维气动导纳函数及相干函数的数学表达式。研究成果可为风-列车-桥梁耦合振动计算分析提供参数。Here,the recognition method for 2D aerodynamic admittance of train was established based on the segmented model pressure measurement method.In turbulent flow field wind tunnel tests,spanwise correlation of train buffeting force on steel truss girder was obtained at 0°angle of attack,3D aerodynamic admittance of train vehicle on steel truss girder was identified,and the relation between 3D and 2D aerodynamic admittances of train vehicle on steel truss girder was explored.It was shown that with increase in dimensionless reduction frequency and spanwise spacing,spanwise correlation of buffeting force gradually decreases,and spanwise coherence function of train buffeting force can be better fitted with Jakobsen model;when k_(1)B/2 is less than 0.3,2D aerodynamic admittance value is 1,and 3D aerodynamic admittance can obviously underestimate aerodynamic admittance value of train;when k_(1)B/2 is larger than 0.3,3D aerodynamic admittance can obviously overestimate 2D aerodynamic admittance function value;aerodynamic admittance value decreases with increase in reduction frequency.Finally,mathematical expressions for 2D aerodynamic admittance function and coherence function of train were given.The study results could provide parameters for calculation and analysis of wind-train-bridge coupled vibration.

关 键 词：桥梁工程 气动导纳 风洞试验 列车 钢桁梁 测压法 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]