# Engineering Mechanics

Proceedings Vol. 32 (2026)

ENGINEERING MECHANICS 2026

Copyright © 2026 Institute of Thermomechanics of the Czech Academy of Sciences, Prague

 

Macháček M., Hračov S., Dejmal K.
pages 81 - 84, full text

This study investigates the post-critical flutter mode of a footbridge deck section model at the onset of instability. Wind tunnel tests were performed on a two-degree-of-freedom model, and the response was evaluated from limit cycle oscillations immediately following flutter onset. The analysis focused on the amplitude ratio and phase relationship between heave and pitch, as well as the flutter frequency and critical wind speed. The results show that aerodynamic modifications significantly affect not only the critical flutter velocity, but also the character of the flutter mode. The modified leading edge promotes torsion-dominated oscillations, while longitudinal ribbons result in a predominantly heave-dominated response.

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