Bistable tuned mass damper for suppressing the vortex induced vibrations in suspension bridges

Saman Farhangdoust , Pejman Eghbali , Davood Younesian

Abstract

The usage of conventional tuned mass damper (TMD) was proved as an effective method for passive mitigating vortex-induced vibration (VIV) of a bridge deck. Although a variety of linear TMD systems have been so far utilized for vibration control of suspension bridges, a sensitive TMD mechanism to wind spectrum frequency is lacking. Here, we introduce a bistable tuned mass damper (BTMD) mechanism which has an exceptional sensitivity to a broadband input of vortex shedding velocity for suppressing VIV in suspension bridge deck. By use of the Monte Carlo simulation, performance of the nonlinear BTMD is shown to be more efficient than the conventional linear TMD under two different wind load excitations of harmonic (sinusoidal) and broadband input of vortex shedding. Consequently, an appropriate algorithm is proposed to optimize the design parameters of the nonlinear BTMD for Kap Shui Mun Bridge, and then the BTMD system is localized for the interior deck of the suspension bridge.

Key Words

bistable tuned mass damper (BTMD); nonlinear vibration control; wind vortex shedding; suspension bridges

Address

Saman Farhangdoust — Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USA
Pejman Eghbali — School of Railway Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
Davood Younesian — School of Railway Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

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