TY - JOUR
T1 - Dynamic simulation of unrestrained interlocking Tuned Liquid Damper blocks
AU - Ong, Peng Pheng
AU - Adnan, A.
AU - Kwok, K. C. S.
AU - Ma, Chau-Khun
AU - Tiong, P. L. Y.
AU - Pesaran Behbahani, Hamid
PY - 2017
Y1 - 2017
N2 - The objective of the study is to develop a new construction material as an alternative for expensive dampers. A Tuned Liquid Damper (TLD) system that is cast in a concrete masonry unit has been proposed. The block has been examined in its individual characteristics to consider the resonant effect of the building subjected to a wide range of water depth, dw, from 5ÃÂ mm to 80ÃÂ mm. The TLD block was designed to internal dimensions of 190ÃÂ mm (length)ÃÂ ÃÂÃÂ 60ÃÂ mm (width)ÃÂ ÃÂÃÂ 90ÃÂ mm (height) in accordance to the Uniform Building Code (UBC) and Eurocode 8. Sine-sweep responses results were plotted in transmissibility ratio, ut/ug to frequency ratio, ω/ωn. The block at a depth of dw was simulated and empirically calculated. Tests for dw of 50ÃÂ mm, 60ÃÂ mm, and 70ÃÂ mm have verified the fundamental frequency, fn, to be similar with the simulated and calculated eigenvalues. Further study of the combined structural model and TLD blocks test as a system has been compared with the numerical simulations. The results varied by approximately 2%. The system has recorded reduction of responses immediately at the test of dw, 5–80ÃÂ mm. Optimum performance has been recorded at 60ÃÂ mm. The test results employed half-power bandwidth to obtain the damping ratio. The damping has been contributed by both viscous damping component and inertia of the moving water body. The Rayleigh stiffness damping component has not been identified to participate in the forced excitation performance reduction. It was found that the new innovative block with tuned liquid can significantly increase the damping characteristics. Hence, the research is necessary to propose an alternative new construction material to withstand earthquake and wind disasters on buildings.
AB - The objective of the study is to develop a new construction material as an alternative for expensive dampers. A Tuned Liquid Damper (TLD) system that is cast in a concrete masonry unit has been proposed. The block has been examined in its individual characteristics to consider the resonant effect of the building subjected to a wide range of water depth, dw, from 5ÃÂ mm to 80ÃÂ mm. The TLD block was designed to internal dimensions of 190ÃÂ mm (length)ÃÂ ÃÂÃÂ 60ÃÂ mm (width)ÃÂ ÃÂÃÂ 90ÃÂ mm (height) in accordance to the Uniform Building Code (UBC) and Eurocode 8. Sine-sweep responses results were plotted in transmissibility ratio, ut/ug to frequency ratio, ω/ωn. The block at a depth of dw was simulated and empirically calculated. Tests for dw of 50ÃÂ mm, 60ÃÂ mm, and 70ÃÂ mm have verified the fundamental frequency, fn, to be similar with the simulated and calculated eigenvalues. Further study of the combined structural model and TLD blocks test as a system has been compared with the numerical simulations. The results varied by approximately 2%. The system has recorded reduction of responses immediately at the test of dw, 5–80ÃÂ mm. Optimum performance has been recorded at 60ÃÂ mm. The test results employed half-power bandwidth to obtain the damping ratio. The damping has been contributed by both viscous damping component and inertia of the moving water body. The Rayleigh stiffness damping component has not been identified to participate in the forced excitation performance reduction. It was found that the new innovative block with tuned liquid can significantly increase the damping characteristics. Hence, the research is necessary to propose an alternative new construction material to withstand earthquake and wind disasters on buildings.
KW - building laws
KW - building materials
KW - damping (mechanics)
KW - frequency
KW - tuned liquid dampers
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:39934
U2 - 10.1016/j.conbuildmat.2017.03.190
DO - 10.1016/j.conbuildmat.2017.03.190
M3 - Article
SN - 0950-0618
VL - 144
SP - 586
EP - 597
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -