AERODYNAMIC ENERGY ANALYSIS OF A BRIDGE DECK DURING LIMIT CYCLE FLUTTER

Abstract eng:
Based on ANSYS FLUENT, a fluid-structure interaction (FSI) model has been developed to investigate the limit cycle flutter (LCF) characteristics of a bridge deck. Its accuracy is verified by simulating the critical flutter state of one thin plate section with theoretical solutions. The unsteady flows around a elastically supported deck at different wind speeds and structural damping are simulated. The LCF phenomenon of the bridge deck is well captured by the present numerical model. The simulated results indicate that the LCF amplitude increases gradually with the wind speed until the divergent flutter occurs. The characteristics of aerodynamic energy input and dissipation during LCF are detailedly investigated. The total mechanical energy varies bounded during LCF, and it remains unchanged in a vibration period. For the LCF occurrence, the work done by aerodynamic forces and the dissipated energy by structural damping should cancel out.

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