The Influence of Changing Stiffness Characteristic of a Semi-active Tuned Mass Damper onto the Effectiveness of Vibration Reduction in a Plate-column Structure

This paper presents selected results of experimental and computational analysis concerning the influence of changing stiffness characteristic of a semi-active tuned mass damper (STMD) onto the effectiveness of vibration reduction in a building's model. The discussed STMD is installed in a laboratory model of three-storey building, which consist of aluminum plates and columns. The model's vibration are caused by kinematical excitation with using the earthquake simulator. The first three eigenfrequencies of the model, corresponding to the lateral eigenforms, are in the frequency range, which STMD can be tuned. This device is a harmonic oscillator with two movable spring elements and thanks to the change of their angle; it is possible to control the stiffness of STMD. Applied, original design solution of STMD allows tuning the vibration eliminator in the frequency range from 0.2 Hz to 4.7 Hz.