Theoretical and experimental research on vibration control of the tuned liquid damper with damping net and sloped-bottom

A novel tuned liquid damper with a damping net and a sloped-bottom (DNS-TLD) is proposed as an alternative to traditional tuned liquid damper (TLD), which has limitations such as low damping efficiency and high water consumption. By combining a sloped-bottom TLD with a damping net, the DNS-TLD can increase liquid sloshing within the tank, providing a greater extra damping ratio while using less water. To demonstrate its seismic reduction process, a controlled structure equipped with a DNS-TLD mechanics model is developed. A simple method is proposed for estimating the total equivalent damping ratio of DNS-TLD. The damping performance of the structure equipped with DNS-TLD is compared and analyzed with other types of TLD using single-frame shaking table tests. Experimental findings are compared with numerical simulation results to substantiate the DNS-TLD damping law and the accuracy of the total equivalent damping ratio calculation approach. Subsequently, seismic dynamic time analysis of a multi-story structure equipped with DNS-TLD is carried out to verify its effectiveness in actual structural seismic reduction control. Both shaking table tests and numerical simulation results demonstrate that DNS-TLD is superior to other types of TLD in terms of damping performance, efficiency, robustness, and engineering applicability by effectively combining the advantages of a sloped-bottom TLD and a damping net.