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Structural Engineering and Mechanics Volume 60, Number 1, October10 2016 , pages 131-148 DOI: https://doi.org/10.12989/sem.2016.60.1.131 |
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Efficiency of TLDs with bottom-mounted baffles in suppression of structural responses when subjected to harmonic excitations |
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Hossein Shad, Azlan Adnan, Hamid Pesaran Behbahani and Mohammadreza Vafaei
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| Abstract | ||
| Tuned Liquid Dampers (TLDs) provide low damping when it comes to deep water condition, and that not all water depth is mobilized in energy dissipation. This research focussed on a method to improve the efficiency of TLDs with deep water condition. Several bottom-mounted baffles were installed inside a TLD and the dynamic characteristics of modified TLDs together with their effect on the vibration control of a SDOF structure were studied experimentally. A series of free vibration and harmonic forced vibration tests were carried out. The controlling parameter in the conducted tests was the Vertical Blocking Ratio (VBR) of baffles. Results indicated that increase in VBR decreases the natural frequency of TLD and increases its damping ratio. It was found that the VBR range of 10% to 30% reduced response of the structure significantly. The modified TLD with the VBR of 30% showed the best performance when reduction in structural responses under harmonic excitations were compared. | ||
| Key Words | ||
| tuned liquid damper; bottom baffles; deep water; vibration control of structures; harmonic excitation | ||
| Address | ||
| Hossein Shad, Azlan Adnan and Hamid Pesaran Behbahani: Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310, Johor, Malaysia Mohammadreza Vafaei: Center for Forensic Engineering, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310, Johor, Malaysia | ||