earticle

영어

Recently, there have been many researches and developments on secondary mass dampers such as TMD (Tuned Mass Damper) and TLCD (Tuned Liquid Column Damper). LCVA (Liquid Column Vibration Absorber) is a special type of TLCD relying on the motion of a column of liquid in a U-shaped container to counteract the forces acting on the structure. Since it has different dimensions for vertical and horizontal portions of container, it has benefits of easy tuning and wide natural frequency range. In this paper, the control performance of LCVA against wind loading is evaluated using shaking table test. Total of three LCVAs with different mass are used in the test in order to assess the control performance In the test, the harmonic loads with varying frequencies were used. The peak and RMS accelerations subjected to resonant frequency input are compared for with and without LCVA. And the peak accelerations subjected to varying frequency inputs are also compared. As a result, it is found that the maximum acceleration and RMS acceleration of the structure decreases up to 49.1% and 54.1% respectively when LCVA is
installed. Especially, as the mass of LCVA increases, i.e., the mass ratio of water mass to structure mass increases, the control performance of LCVA increases.