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Vibration Mitigation of Structures through TLCD with Embedded Baffles

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Abstract

In order to have an efficient Tuned Liquid Column Damper (TLCD) to mitigate vibrational energy of structures its damping level should be properly adjusted. This study proposes a new method of damping control of the TLCD by installing one-directional baffles. Compared to other existing methods, the proposed technique is simpler in design, easier in installation and maintenance, more practical to be used in real scale TLCDs, and has high potential to be used as an active control damping system. In this study, the dynamic characteristics of modified TLCD with different types of baffles were obtained by investigating their effect on the characteristics of Structure-TLCD system (S-TLCD), and structural responses of the S-TLCD under harmonic excitation. The effects of baffles were checked in three places with five different blockage ratios. TLCD equipped with baffles located horizontally at the external side of columns’ entrance, which is called Horizontal Side Baffle (HSB) with 60 % blockage ratio (T + HSB60) showed the best performance among different types of studied baffles; it increased the damping of the structure from 1.2 to 8 % and reduced the maximum acceleration response by 77 %. However, the TLCD without baffles increased the damping to 1.8 % and reduced the maximum acceleration response by 59 %. Installation of HSB60 increased the head loss coefficient of conventional TLCD 4.8 times, while it had an insignificant effect on natural frequency.

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Acknowledgments

We would like to take the opportunity to express our sense of gratitude to Prof. Dr. Kenny Kwok for the effective discussion and comments to improve the quality of the work during his visit to Universiti Teknologi Malaysia.

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Authors and Affiliations

  1. Engineering Seismology and Earthquake Engineering Research (E-SEER), Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia

    H. P. Behbahani, A. bin Adnan, H. Shad & O. P. Pheng

  2. Centre for Forensic Engineering, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia

    M. Vafaei

Authors
  1. H. P. Behbahani
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  2. A. bin Adnan
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  3. M. Vafaei
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  4. H. Shad
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  5. O. P. Pheng
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Corresponding author

Correspondence to A. bin Adnan.

Appendix I

Appendix I

The time histories of liquid displacements in free vibration tests for different TLCD models are provided in this section.

Fig. 13
figure 13

Obtained displacement response Vs. Time from free vibration test for S-TLCD systems with isntalled baffles

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Behbahani, H.P., Adnan, A.b., Vafaei, M. et al. Vibration Mitigation of Structures through TLCD with Embedded Baffles. Exp Tech 41, 139–151 (2017). https://doi.org/10.1007/s40799-016-0163-0

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  • DOI: https://doi.org/10.1007/s40799-016-0163-0

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