Abstract Summary
In the context of hybrid passive control, the effectiveness of the Tuned Liquid Column Damper (TLCD) has been well-established for the seismic vibration control of base-isolated (BI) systems both numerically and experimentally. In contrast to the previous studies on TLCDs, the present study explores the possibility of equipping a BI system with a sliding model of TLCD (STLCD), until now proposed just for the suppression of wind-induced vibration of fixed base structures. Specifically, the proposed STLCD consists of a U-shaped tank partially filled with water, mounted on a roller support and connected to the BI system by a springdashpot system. Firstly, an analytical study is developed to analyze the optimal control performance of this device with focus on the reduction of displacements and accelerations of the BI system. The goodness of the theoretical results is assessed via vast shaking table testing campaign undertaken in the Laboratory of Experimental Dynamics of the University of Palermo, Italy. In implementing the experimental tests, a small-scale model of a single-degree-of-freedom (SDOF) BI structure with the STLCD is constructed and the effectiveness of the proposed combined control strategy is experimentally evaluated. Finally, comparisons with traditional TLCDs and TMDs are presented and the influence of mass ratio, damping ratio and structural frequency on control efficiency is discussed.
