COUPLING OF CABLE VIBRATION AND ITS DAMPING EFFECT IN LONG-SPAN CABLE-STAYED BRIDGE

THE TATARA BRIDGE

Abstract

The present paper discusses characteristics of coupled cable vibration and its effects on damping of the Tatara Bridge, the world-longest cable-stayed bridge at the moment, by the theoretical modal analysis based on the substructural synthesis and also by the experimental modal analysis based on the Eigensystem Realization Algorithm.
It is found through this study that many numbers of cables' local modes can be coupled with the principle globalmodes of long-span cable-stayed bridges, which can reduce the damping ratios of the global modes of bridge due to low damping characteristics of the stay cables.