Wind and Structures

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Wind-induced coupled translational-torsional motion of tall buildings

  • Thepmongkorn, S. (Department of Civil Engineering, The University of Sydney) ;
  • Kwok, K.C.S. (Department of Civil Engineering, The University of Sydney)
  • Published : 1998.03.25
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Abstract

A three-degree-of-freedom base hinged assembly (BHA) for aeroelastic model tests of tall building was developed. The integral parts of a BHA, which consists of two perpendicular plane frames and a flexural pivot, enable this modeling technique to independently simulate building translational and torsional degree-of-freedom. A program of wind tunnel aeroelastic model tests of the CAARC standard tall building was conducted with emphasis on the effect of (a) torsional motion, (b) cross-wind/torsional frequency ratio and (c) the presence of an eccentricity between center of mass and center of stiffness on wind-induced response characteristics. The experimental results highlight the significant effect of coupled translational-torsional motion and the effect of eccentricity between center of mass and center of stiffness on the resultant rms acceleration responses in both along-wind and cross-wind directions especially at operating reduced wind velocities close to a critical value of 10. In addition, it was sound that the vortex shedding process remains the main excitation mechanism in cross-wind direction even in case of tall buildings with coupled translational-torsional motion and with eccentricity.

Keywords

References

  1. Bearman, P.W. and Davies, M.E. (1975), "The flow about oscillating bluff structures" , Proceedings of the 4th International Conference on Wind Effects on Buildings and Structures, Cambridge University Press, September, 285-295.
  2. Kareem, A. (1985), "Lateral-torsional motion of tall buildings to wind loads", Journal of Structural Engineering 111(11) 2479-2496. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:11(2479)
  3. Kwok, K.C.S. (1977), "Cross-wind response of structures due to displacement dependent excitations", thesis presented to the Department of Mechanical Engineering, Monash University, at Victoria, Australia, in fulfilment of the requirements for the degree of Doctor of Philosophy, 155-163.
  4. Kwok, K.C.S. and Melbourne, W.H. (1981), "Wind-induced lock-in excitation of tall structures" , Journal of the Structural Division ASCE 107(ST1) 57-72.
  5. Kwok, K.C.S., Wilhelm, P.A. and Wilkie, B.G. (1988), "Effect of edge configuration on wind-induced response of tall buildings" , Engineering Structures 10 135-140. https://doi.org/10.1016/0141-0296(88)90039-9
  6. Kwok, K.C.S., Lakshmanan, N. and Donovan, P.F. (1994), "Development of a special base hinge assembly for stick models", Report PROJ.UNDP/IND/91/011, Structural Engineering Research Centre, Madras, India, December.
  7. Melbourne, W.H. (1975), "Cross-wind response of structures to wind action" , Proceedings of the 4th International Conference on Wind Effects on Buildings and Structures, Cambridge University Press, September, 343-358.
  8. Patrickson, C.P. and Friedmann, P.P. (1979), "Deterministic torsional building response to winds" , Journal of the Structural Division ASCE 105(ST12) 2621-2637.
  9. Standards Australia, SAA Loading Code Part 2 : Wind Loads, AS1170.2-1989.
  10. Tallin, A. and Ellingwood, B. (1985), "Wind induced lateral-torsional motion of buildings" , Journal of Structural Engineering 111(10) 2197-2213. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:10(2197)
  11. Thepmongkorn, S., Kwok, K.C.S. and Lakshmanan, N. (1997), "A two-degree-of-freedom base hinged aeroelastic (BHA) model for response predictions", Volume of Abstracts, 4th Asia-Pacific Symposium on Wind Engineering, Gold Coast, Australia, July, 239-242.

Cited by

  1. Effects of coupled translational-torsional motion and eccentricity between centre of mass and centre of stiffness on wind-excited tall buildings vol.5, pp.1, 2002, https://doi.org/10.12989/was.2002.5.1.061