Operational monitoring and mitigation of wind-Induced vibration for a parallel cable stayed bridge

Abstract

Vortex induced vibration (VIV) was observed in the second Jindo Bridge in South Korea, and a Multiple Tuned Mass Damper (MTMD) was designed and installed by a private design company to increase the mechanical damping and reduce the vibration. Due to overdesigning of the actual damping system, an alternative design of the MTMD is proposed. The design procedure was decided based on wind tunnel tests, field monitoring, and numerical simulation. The design theory of the TMD and MTMD was studied, and the design properties of the single TMD are used for the preliminary design of the MTMD. Design criteria were considered and MTMD design procedure was established based on the defined criteria. The procedure was applied to the second Jindo Bridge. Then an alternative design was proposed. Satisfying the design criteria and presenting good properties for mitigating the VIV, this procedure is sufficiently safe, based on the performed numerical simulation. Moreover, it is not overdesigned for the required performance. After understanding and applying the MTMD design procedure, the current MTMD performance is evaluated based on field monitoring and the general properties of the MTMD and VIV are verified.