EFFECTS OF ELASTICITY ON THE DAMPING CHARACTERISTICS OF VISCOUS SHEARING DAMPER AND ESTIMATION CURVE FOR MODAL DAMPING IN STAY CABLES WITH THIS TYPE OF DAMPERS

Abstract

In recent years, wind-induced cable vibrations of cable-stayed bridges have been observed, and phenomena of these have become a major problem in the wind engineering. In the present paper, the effects of elascity on the damping characteristics of viscous shearing damper are investigated, and the full scale measurements for a actual bridge cable are compared with the results of complex-eigenvalue calculations taken into consideration the elascity in order to examine the damper effectiveness. Furthermore, a simple design curve for estimating the modal damping in stay cables with dampers is proposed from the practical point of view. The use of the design curve is also illustrated through actual examples of bridge stay cables.