Wind-Tunnel Investigations of the Aerodynamics of Bridge Stay Cable Cross-Sectional Shapes
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2021-08-01
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Edition:September 2014–September 2016
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Abstract:Experiments on stationary sectional models of scaled replica of bridge stay cables were carried out in a 2-by 3-m wind tunnel. The cross-sectional shapes of the cable models were obtained from direct measurements of stay cables for bridges in service. The purpose of the experiments was to establish a relationship between the level of eccentricity and surface irregularities of the cross-sectional shapes of stay cables and their propensity to experience wind-induced vibrations. The experiments confirmed that the aerodynamics of the stay cables are highly sensitive to their cross-sectional shapes. A small deviation from the mean curvature had an important influence on the aerodynamic force coefficients, in particular the mean across-wind force coefficients in the critical Reynolds number regime. Based on a quasi-steady analysis of the experimental results, negative aerodynamic damping in excess of 1 percent of critical could be predicted, confirming the propensity of stay cables to gallop for certain orientations to the flow, Reynolds numbers, and cross-sectional irregularities. Because of these experiments, researchers concluded that changes in across-wind forces as a function of angle of attack and Reynolds numbers could be the main contributors to anticipated wind-induced vibrations. Finally, this report discusses how such critical angles can be identified.
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