265 / 2022-08-26 22:29:01

Theoretical and experimental studies on accurate cable tension identification of short cables

Cable Tension Identification; Galerkin Method;String Theory;Short Cables

    Cables as the force transmission components are widely used in large-span bridges, such as the cable-stayed bridge, the suspension bridge and the bottom-through arch bridge. The damage of the cable will reduce the safety and durability of the bridges. Thus, the change of cable force is an important indicator to judge the service status of bridge. However, practice indicates that the existing methods have inevitable errors in the identification of short cable force, which are difficult to satisfy the needs of engineering. Therefore, This paper proposed an improved cable force identification method based on the mode shape method. This paper proposed an improved cable force identification method based on the mode shape. The method established the equivalent string model of the cable-bar system. Then, the Galerkin was adopted to convert the structural parameters. Finally, the equivalent parameters are used to obtain the cable force according to the string theory. The cable force test is carried out by taking a short cable of about 8.11m in the three-span arch bridge. The experimental results show that the proposed method has high accuracy for the identification of short cable force, and the identification error is within 3%.