Abstract
A tuned mass damper is usually used to reduce wind-induced vibration of towers and high rise buildings. However it is not so effective for the structures of which the natural frequency is varied for the case of building up bridge-towers. For these structures the semi-active controlling method seems to be effective in reducing the vibration. This paper proposes a new semi-active vibration controlling method and an adaptive tuned mass damper ATMD consists of a pendulum and an analogue controlling system. In this system the tuning condition of the ATMD is realized by retaining the phase lag of the damper mass to the main structure to be 90°. The effectiveness of the proposed ATMD is evaluated analytically and experimentally.
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