ケーブル系橋梁の維持管理のための振動計測に基づくダンパー付ケーブルの張力推定手法の開発

抄録

In the maintenance of cable structures, such as cable-stayed bridges, it is necessary to estimate the tension acting on the cables. In current Japanese practice, the cable tension is estimated using the vibration method or the higher-order vibration method from the cable’s natural frequencies. However, in recent years, the aerodynamic vibration of cables caused by wind has become a problem. To suppress the aerodynamic vibration, dampers are installed onto the cables. Because the damper changes the cable’s natural frequencies, the vibration method and higher-order vibration method are inappropriate for measuring the tension of a cable with a damper. This paper introduces a tension estimation method for a cable with a damper proposed by the authors. The authors’ method inversely estimates the tension and bending stiffness of the cable and damper parameters, simultaneously, from the natural frequencies. The validity of the method was confirmed by conducting numerical simulations and experiments.