Abstract
An elevator rope for a high-rise building is excited forcibly by the displacement of the building caused by wind forces and earthquakes. In this paper, experiments of free vibration and forced vibration of rope are presented for obtaining the natural frequency and the damping coefficient of rope. And experiments of forced vibration of rope whose length varies with time due to the up-and-down movement of the cage are presented. Finite difference analyses of rope vibration are also performed by considering the time-varying length of the rope; based on the assumption that the movement velocity is constant. The calculated results of the finite difference analyses are in fairly good agreement with that of the experimental results.
