Abstract:As an important load-bearing component of cable-supported bridge, the sling determines the bearing capacity and durability of bridge. The study of its dynamic characteristics is of great significance for the design, operation and maintenance of suspension bridge and arch bridge. Firstly, by using the frequency equation of the sling under arbitrary boundary conditions obtained by the dynamic stiffness method (DSM), and combined with the Wittrick-Williams (W-W) algorithm, an accurate method for calculating the vibration modal frequency of the sling is proposed, and a set of refined analysis theory suitable for the dynamic characteristics analysis of the sling is formed. Secondly, the accuracy of the method is verified by utilizing the model parameter degradation, literature methods and finite element modeling solutions. Finally, through the comparison with the measured data of Mingzhou Bridge, it is shown that the analysis theory has the good feasibility in practical engineering. This theoretical system provides a reference for further research on the dynamic characteristics of slings, and to some extent, guides the design and monitoring of slings in practical engineering.
