Abstract
Abstract This paper presents the results of a full-scale installation of a passive vibration absorber, called a Liquid Column Vibration Absorber (LCVA), on a 67 m high steel frame communications tower. Twenty individual bi-directional LCVA units were designed to mitigate the tower's wind-induced first mode resonant response along both of the tower's principal axes. Damping properties and wind-induced response of the tower were investigated without a LCVA system installed, with a Single LCVA (SLCVA) system installed; that is, with the natural frequency of each individual LCVA unit the same and approximately equal to the first mode natural frequency of the tower; and with a Multiple LCVA (MLCVA) system installed; that is, with the natural frequencies of each individual LCVA unit distributed about the first mode natural frequency of the tower. Both SLCVA and MLCVA systems proved to be effective methods of increasing the total structural damping of the tower, and reduced the wind-induced resonant response of the tower by up to approximately 50%.
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