A Study on Countermeasures for Wake Galloping in Parallel Cables of Cable-Stayed Bridges

Abstract

Wake galloping and other vibrations were observed in the cables of the Hitsuishi-jima Bridge and Iwakuro-jima Bridge of the Honshu-Shikoku Bridges, and spacers and connecting wires were installed to control the vibration of the cables. However, the“Sub-Span Vibrationwith” with limited amplitude has been observed since the completion of the bridges, and it seems that this vibration causes the damage in the connecting wires. The application of the trip wires as the countermeasure to this “Sub-Span Vibration” was investigated. Wind tunnel tests with full scale sectional models and field tests were conducted and it was confirmed that the trip wires are effective. In this report, the results of the wind tunnel tests and field tests are reported.