Wind and Structures

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The efficiency and robustness of a uni-directional tuned liquid damper and modelling with an equivalent TMD

  • Tait, M.J. (Department of Civil and Environmental Engineering, University of Western Ontario) ;
  • Isyumov, N. (Department of Civil and Environmental Engineering, University of Western Ontario) ;
  • El Damatty, A.A. (Department of Civil and Environmental Engineering, University of Western Ontario)
  • Received : 2003.03.28
  • Accepted : 2004.01.22
  • Published : 2004.08.25
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Abstract

The current study reports the results of an experimental program conducted on a structure fitted with a liquid damper (TLD) and subjected to harmonic excitation. Screens were placed inside the TLD to achieve the required inherent damping. In the first part of the study, reduced scale models of the building-TLD systems were tested under two levels of excitation. The efficiency of the damper was assessed by evaluating the effective damping provided to the structure and comparing it to the optimum effective damping value, provided by a linear tuned mass damper (TMD). An extensive parametric study was then conducted for one of the three models by varying both the excitation amplitude and the tuning ratio, defined as the ratio of the TLD sloshing frequency to the natural frequency of the structure. The effectiveness and robustness of a TLD with screens were assessed. Results indicate that the TLD can be tuned to achieve a robust performance and that its efficiency is not significantly affected by the level of excitation. Finally, the equivalent amplitude dependent TMD model, developed in the companion paper is validated using the system test results.

Keywords

References

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  2. Application of tuned liquid dampers in controlling the torsional vibration of high rise buildings vol.21, pp.5, 2015, https://doi.org/10.12989/was.2015.21.5.537
  3. Analytical and experimental study on natural sloshing frequencies in annular cylindrical tank with a bottom gap vol.57, pp.5, 2016, https://doi.org/10.12989/sem.2016.57.5.877
  4. Testing of tuned liquid damper with screens and development of equivalent TMD model vol.7, pp.4, 2004, https://doi.org/10.12989/was.2004.7.4.215
  5. Performance of Tuned Liquid Dampers vol.134, pp.5, 2008, https://doi.org/10.1061/(ASCE)0733-9399(2008)134:5(417)
  6. Modelling and preliminary design of a structure-TLD system vol.30, pp.10, 2008, https://doi.org/10.1016/j.engstruct.2008.02.017
  7. Effectiveness of a 2D TLD and Its Numerical Modeling vol.133, pp.2, 2007, https://doi.org/10.1061/(ASCE)0733-9445(2007)133:2(251)
  8. Reduced Equivalent Static Wind Loads for Tall Buildings with Tuned Liquid Dampers vol.226-228, pp.1662-7482, 2012, https://doi.org/10.4028/www.scientific.net/AMM.226-228.1218
  9. Development and Validation of Finite Element Structure-Tuned Liquid Damper System Models vol.137, pp.11, 2015, https://doi.org/10.1115/1.4030866
  10. A variably baffled tuned liquid damper to reduce seismic response of a five-storey building vol.171, pp.4, 2018, https://doi.org/10.1680/jstbu.16.00034