Theoretical analysis and experimental research on control performance of active tuned liquid damper

Abstract

Aiming at the shortcomings of the damping performance of the traditional tuned liquid damper (TLD), a damping technology scheme that organically combines the TLD with the active control device is proposed to form an active tuned liquid damper (ATLD) based on the sliding mode control algorithm. Based on the intensive analysis of ATLD damping characteristics, the ATLD-single degree of freedom structural mechanics model is established according to the composite damping of the structure by the active control force and the passive control force of TLD. To verify the accuracy of the theoretical mechanical model of ATLD and to investigate the effects of structural period and seismic site category on the real damping performance of ATLD, three different period single-degree-of-freedom steel framework test models are adopted to complete the seismic simulation shaking table tests. The sliding-mode control algorithm with a steep saturation function is proposed to eliminate the structural jitter effect. The dynamic test and theoretical results show that the numerical calculation results and the test results have good agreement in terms of the peak displacement and the root mean square. The introduction of an active control device into TLD can significantly improve the seismic performance of traditional TLD. ATLD can produce an excellent seismic control effect on the controlled structure under all kinds of site conditions, and the damping effect is better with the increase of the site category. ATLD is more suitable for medium and high-rise buildings, and it has a good prospect for engineering applications.