ABSTRACT
For existing cable-stayed bridges, cables are commonly installed in association with attachment or support components such as protective tubes, rubbers or dampers near anchorages, posing complex boundary conditions in cable models. Vibration-based cable tension estimation, in effect, with perfectly hinged or fixed supports can trigger underestimation or overestimation compared to the actual cable force. This paper proposes distinct schemes for the identification of cable tension by vibration method, accounting for uncertain boundary conditions including rotational and translational restraint ends. Based on each scheme, corresponding explicit forms of the cable tension are derived by the applying asymptotic solution in order to alleviate transcendental terms of the exact solution. Finally, to get insight into such effects of these restraints on the cable force, an investigation was implemented through a numerical example, considering a whole range of restraint stiffness at cable ends.
