A study on the nonlinear flutter amplitude characteristics of a streamlined box girder section

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 158-165.

ZHU Jinbo1,ZHENG Shixiong1,TANG Yu2,GUO Junfeng1

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Abstract

The self-excited aerodynamic force of the streamlined box girder cross section is related to the amplitude nonlinearly.In order to predict the flutter critical wind speed accurately and then explore the post flutter state with the large amplitude vibration, self-excited aerodynamic forces varying with converted wind speeds and amplitudes were identificated based on the established numerical tunnel wind model.Then the corresponding nonlinear flutter derivatives were calculated.On the basis of the classical flutter theory, a finer complex modal eigenvalues solution method of two degrees of freedom, considering the factors of flutter amplitudes, was proposed.Based on this method, a program for searching the nonlinear flutter amplitude response was developed, and the amplitude characteristics after flutter were investigated.The results show that under the single frequency vibration of single degree of freedom, the proportion of aerodynamic nonlinear components increases with the amplitude of bridge section, especially the single twist.The flutter analysis method developed in this paper can accurately predict the flutter critical wind speed.After flutter, vibration amplitude will appear a step growth.When achieving a substantial value, the amplitude will be in the vibration state of increasing slowly.

Key words

streamlined box girder / nonlinear derivatives / flutter analysis / post flutter state

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ZHU Jinbo1,ZHENG Shixiong1,TANG Yu2,GUO Junfeng1. A study on the nonlinear flutter amplitude characteristics of a streamlined box girder section[J]. Journal of Vibration and Shock, 2018, 37(24): 158-165

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