Comparison of Effectiveness of TLCBD Over LCVA in Vibration Control of Structure Under Non-stationary Earthquake

Abstract

Liquid column vibration absorber (LCVA) is very much useful to mitigate the responses generated by the dynamic forces due to its cost-effectiveness dynamic vibration absorbing property. LCVA is usually a U-shaped tube having different cross-sectional areas in the vertical and horizontal column, normally filled up with water. The basic working principle of LCVA is to dissipate the vibration energy by gravitational force and the viscous force generated by the water present in the column. The damping force generation by the liquid movement through the orifice is very less in case of LCVA. To overcome this aspect, a new system is introduced which is called tuned liquid column ball damper (TLCBD) where a metal ball is installed in the horizontal part of the tube instead of orifice present in the LCVA. In the present study, the optimum performance of the response reduction of the structure is compared for both these systems. The numerical study has been performed by considering a single degree of freedom (SDOF) structure with an LCVA and TLCBD attached on the top of it separately under non-stationary random earthquake. The stochastic structural optimisation has been performed for both the cases and their results are compared. The results are confirmed the disparity between the response reduction of these two damper systems and improved response reduction is achieved for TLCBD system over LCVA system.