Study on reduction of the wind load and the aerodynamics vibration of the bridge girder by the bridge appendages

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Study on reduction of the wind loads and the aerodynamics vibrations of bridge girder by appendages with spanwise inhomogeneous section was conducted using wind tunnel. The appendages with spanwise inhomogeneous section were effective on reduction of fluctuating lift acting on the models with some side ratio. For the models with other side ratio, openings with spanwise inhomogeneous section were effective.Spectral analysis of the hot-wire data was conducted for evaluation of spanwise correlation length. Coherence values at vortex shedding frequency were plotted as function of distance. It could be represented well by Gaussian function, and correlation length was derived as integral scale. Evaluation method of windward correlation length was also proposed with employing auto-correlation function.