Title

Advances in the understanding of wind-induced cable vibration phenomena in the subcritical and critical Reynolds number regimes

Document Type

Conference Proceeding

Publication Date

12-1-2011

Publication Title

Proceedings, Annual Conference - Canadian Society for Civil Engineering

Volume

2

First Page

979

Last Page

989

Abstract

Wind-induced cable vibration is a contemporary issue in cable-stayed bridges, which potentially threatens the safety of the structure. A thorough understanding of the fundamental physics underlying these phenomena is a priori for developing effective counter measures. In the present paper, possible mechanisms associated with a divergent type response and a limited-amplitude instability have been studied based on the flow structure around a rigid circular cylinder. Results show that the wind velocity, the cable orientation, and the dominant cable motion direction could be the three most important components in the excitation mechanisms of these two phenomenal. While the former two would govern the intensity of axial flow and delay the transition from subcritical to TrBL1 regime under certain conditions, the cable dominant motion direction would play the role of dictating the contributing factors to the aerodynamic damping ratio and thus control the response characteristics. For both phenomena, an enhanced longitudinal spatial correlation of sectional aerodynamic forces was identified.

ISBN

9781618392183

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