SUPPRESSION OF WIND-INDUCED VIBRATION BY DYNAMIC DAMPERS IN TOWER-LIKE STRUCTURES

Three types of dampers for the suppression of wind-induced vibration in flexible tower-like structures are introduced. Two dampers are so-called Tuned Mass Dampers (TMD), whereby one is a pendulum-type with magnetic damper applied to a self-supporting type steel stack, and the other is a compact-cylinder-type using air resistance through a narrow space which is applied to the tower of a mono cable-stayed bridge for pedestrains only. The third type of damper is a so-called Tuned Sloshing Damper (TSD), which uses the sloshing phenomenon of water in a rectangular tank and which is applied to the free-standing tower of a long-span cable-stayed bridge. In all cases, the results of damped free vibration tests with and without the dampers demonstrated their effectiveness. In addition, in the case of the steel stack, the suppression effect was determined from aerodynamic response observation results.