Vibration Control of a Cable-stayed Footbridge Using the Tension Changes of Cable

The paper presents the theoretical analysis for active reducing resonant vibration in cable-stayed footbridges. The method relies on changing the static tension in chosen cables. The tension changes cause a change in those natural frequencies that are close to the excitation frequency. The paper also seeks to establish which combinations of tensions in cables lead to the fastest change in the values of a chosen natural frequency. For this purpose eigenproblem sensitivity analysis, formulated for the structure according to the second order theory were used. The effectiveness of the method was tested using an FEM model of a footbridge.