Segmental model tests for post flutter characteristics of truss-stiffening girder suspension bridge

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (5) : 1-8.

ZHANG Ruilin1,2, YANG Hongbo3, LIU Zhiwen1,2, YANG Jian3, CHEN Zhengqing1,2

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Abstract

A truss stiffening girder suspension bridge with a main span of 1100m was taken as the engineering background. The wind tunnel tests of the spring-suspend section model were conducted to study the characteristics and mechanism of the post flutter. First, the structural parameters of the section model test system with the truss girder were tested. Then, the flutter tests of the truss girder section model were carried out at different wind attack angles. Finally, the mechanism of limit cycle oscillation (LCO) for the truss girder section model was discussed in the view of nonlinear damping. The results show that there are obvious damping nonlinearity and slight stiffness in the section model test system with the truss girder at large amplitudes. The LCO of the truss girder section model is observed at each wind attack angle. Wind attack angle has significant effects on the critical flutter wind speed and the slopes of the amplitude versus wind speed. The LCO of the truss girder section model is characterized by a coupled bending and torsion vibration, and the bending-torsion coupling level increases as the amplitude increases. For the wind tunnel tests of the truss girder section model, structural damping nonlinearity is a favorable factor for the stability of LCO, while aerodynamic damping nonlinearity has different effects at different wind attack angles.

Key words

suspension bridge / truss stiffening girder / post flutter / nonlinear damping / wind tunnel test

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ZHANG Ruilin1,2, YANG Hongbo3, LIU Zhiwen1,2, YANG Jian3, CHEN Zhengqing1,2. Segmental model tests for post flutter characteristics of truss-stiffening girder suspension bridge[J]. Journal of Vibration and Shock, 2022, 41(5): 1-8

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