Intelligent Column with Use of Earthquake Forces for Vibration Control

Abstract

A method of vibration control for a column carrying a mass at its tip subjtected to earthquakes is described. A vibration control mechanism consisting of a gear train for the column is also described. Experimental tests have been performed for a model of the present mechanism. It is shown that the vibration displacements and the moments in the column are reduced significantly in comparison with those in a conventional column without the mechanism. In the present column, energies for controlling vibrations are not required because of the use of earthquake force as a control force. Therefore, the column has advantages over the columns having an active vibration control system.