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Influence of the initial amplitude on the flutter performance of a 2D section and 3D full bridge with a streamlined box girder

颤振 结构工程 振动 风洞 大梁 空气动力学 非线性系统 风速 情态动词 气动弹性 振幅 联轴节(管道) 空气动力 工程类 机械 物理 声学 材料科学 气象学 机械工程 高分子化学 量子力学
作者
Zhiguo Li,Bo Wu,Haili Liao,Mingshui Li,Qi Wang,Huoming Shen
出处
期刊:Journal of Wind Engineering and Industrial Aerodynamics [Elsevier BV]
卷期号:222: 104916-104916 被引量:14
标识
DOI:10.1016/j.jweia.2022.104916
摘要

The flutter performance of a streamlined box girder under different external excitations is experimentally examined in this study using a free-vibration wind tunnel test of a section model. The dependence of the critical wind speed on the initial torsional amplitude is observed in the test. The nonlinear flutter derivatives as functions of the reduced wind speed and vibration amplitude are then identified using a forced-vibration wind tunnel test. The results reveal the close relationship of the torsional-motion-related flutter derivatives with the nonlinearity emerged in the flutter of the girder. The mechanisms leading to the dependence of the flutter response and critical wind speed on initial conditions is investigated through a flutter analysis in which the modal properties are expressed as functions of the wind speed and amplitude. The results indicate that the uncoupled aerodynamic negative damping plays an important role in weakening the flutter performance of the girder. Finally, the influences of the modal coupling effect and the spanwise variation of the self-excited forces (or equivalently, the flutter derivatives) on the modal properties and the flutter performance of a full bridge are discussed. The results show that the modal frequency of the full bridge is mainly affected by the spanwise variation of the nonlinear flutter derivatives, while the modal damping ratio (or equivalently, the critical wind speed) is affected by both the spanwise variation of the nonlinear flutter derivatives and the mode coupling effect.
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