Abstract
Tuned liquid column ball damper (TLCBD) is a passive control device used for controlling the building vibrations induced from wind or earthquakes. TLCBD is a modified form of conventional tuned liquid column damper (TLCD). This paper studies the effect of TLCBD on the four-storey steel frame structure. The performance of the TLCBD is also compared with conventional TLCD. The analytical model of both TLCD and TLCBD is presented here. The effectiveness of these analytical models is examined experimentally by series of shaking table tests under different excitation levels including harmonic loadings and seismic excitations. In TLCBD, the vibration is reduced significantly as compared to TLCD by using steel ball as a moving orifice. The difference in diameter of steel ball and tube, containing the liquid column, acts as an orifice which moves with the movement of the ball. This moving orifice phenomenon enhanced the vibration reduction effect by resisting the water motion in the TLCBD. Root mean square (RMS) and peak values of acceleration were calculated for each loading and each storey of uncontrolled and controlled structures. Comparison of the time histories of controlled and uncontrolled structures for different loadings is also reported. Results indicate that the TLCBD is more effective in the earthquake scenarios as compared to the harmonic excitations. The TLCBD controls the vibration of the primary structure significantly in vibration reduction.
Highlights
Due to the persistently increasing trend in construction of tall buildings and using lightweight aggregates as well as high strength materials, the tall building structures are susceptible to greater vibrations and deflections under wind loads and seismic excitations [1]
The results indicated that Tuned liquid column ball damper (TLCBD) reduced the response of the structure better than tuned liquid column damper (TLCD)
The present study has focused on the performance of the TLCBD controlled four storey building structure
Summary
Due to the persistently increasing trend in construction of tall buildings and using lightweight aggregates as well as high strength materials, the tall building structures are susceptible to greater vibrations and deflections under wind loads and seismic excitations [1]. Application of tuned liquid column ball damper for improved vibration control performance of MDOF structure tuned liquid column damper (TLCD)[2,3,4]. Among these is the TLCD which was initially proposed by Sakai in 1989 [5]. Application of tuned liquid column ball damper for improved vibration control performance of MDOF structure horizontal portion of TLCBD [32]. For time history analysis, controlled structures having TLCBD, TLCD and uncontrolled structure have been subjected to base excitation which included some historical earthquake data and the harmonic vibrations.
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