Response control of cable-stayed arch bridge using modified hanger system

Abstract

Vertical or inclined cables which are placed in bridges as a hanger system affect the dynamic performance of bridges. Inclined hangers can be used instead of vertical hangers to improve the stability of the bridge aerodynamically. However, inclined hangers are susceptible to fatigue more than vertical ones. Considerable signs of distress or slackness might be shown by some inclined hangers because of their location on the bridge. In this study, a cable-stayed arch bridge with vertical and inclined hangers has been compared to investigate the effect of hangers on the dynamic performance of the bridge. To reduce the internal cable forces and the probability of fatigue or force fluctuation in hangers, additional horizontal cables are applied on inclined hangers that transfer the tensile load from overstressed hangers to adjacent ones with lower forces. By modification, the results demonstrate the higher stiffness and human comfort level for the bridge that improve the dynamic behavior and control the responses of the bridge.