Study on fatigue features of box-shaped cable-girder anchorage for cable-stayed bridges with steel box girders by model test

摘要

With heavy stress concentration, the fatigue of cable-girder anchorage is one of the most important issues to be considered for the design of long-span cable-stayed bridges. The cable-girder anchorage of the Sutong Bridge taken as subject investigated, the design of experiment model, the determination of fatigue load range and the mechanical features of main components are investigated. The fatigue safety of the cable-girder anchorage in design life and limit life are verified by model test. The results indicate that the accurate simulation of mechanical characteristics and boundary condition of the actual structure can be achieved by the triangular design scheme of the model test with vertical column. The load transfer mechanism of main components of cable-girder anchorage differs notably. The stress concentrations in web plates and bottom plates are predominant. Overall, Sutong Bridge cable-girder anchorage is a reasonable design, and fatigue performance can meet with the design requirements.