端部条件和长宽比对矩形断面节段模型涡激振动的影响  

Effects of end conditions and aspect ratios on vortex-induced vibration for a rectangular sectional model

作　　者：温青 华旭刚[2] 池俊豪[1] 王修勇 孙洪鑫 WEN Qing;HUA Xu-gang;CHI Jun-hao;WANG Xiu-yong;SUN Hong-xin(Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control,College of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]湖南科技大学土木工程学院结构抗风与振动控制湖南省重点实验室,湖南湘潭411201 [2]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082

出　　处：《振动工程学报》2020年第4期653-659,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51708208,51778228)。

摘　　要：针对节段模型涡激振动风洞试验的端部效应和长宽比效应,通过不同端部条件和不同长宽比的宽高比5∶1矩形断面节段模型弹性悬挂风洞试验,分析了不同端部条件和长宽比下涡振振幅特征以及模型表面风压和气动力特征。试验结果表明:1)端部条件会略微影响节段模型涡激振动特征;2)模型长宽比会显著影响节段模型涡激振动特征,当长宽比大于两倍端部效应影响长度时,涡振振幅随着长宽比增加而呈现略微增大的趋势;当长宽比小于两倍端部效应影响长度时,涡振振幅随着长宽比减小而加剧减小。节段模型设计时应高度重视模型长宽比设计,合理选择模型长宽比。To investigate the effects of end conditions and aspect ratios on vortex-induced vibration(VIV)for a rectangular sectional model,a series of wind tunnel tests are performed on an elastically suspended B/D=5∶1 rectangular cylinder with various end conditions and aspect ratios.The properties of vortex-induced vibration,wind pressures and aerodynamic forces are studied by measuring displacement responses and wind pressures.The results indicate that:a)the effect of end conditions on VIV can be neglected;b)the amplitudes of VIV slightly increase with the increase of the length of the model when the length of the model is larger than twice interference length of end conditions,and sharply decrease with the decrease of the length of the model when the length of the model is less than twice interference length of end conditions.More attention should be taken to the design of aspect ratio of model for wind tunnel tests.A suitable large aspect ratio of the model may provide reliable results.

关 键 词：涡激振动 桥梁 风洞试验 节段模型 端部条件 长宽比 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TU973.32[交通运输工程—道路与铁道工程]