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Wind and Structures
  Volume 11, Number 4, July 2008 , pages 323-340

Investigation of 3-D dynamic wind loads on lattice towers
Lianghao Zou, Shuguo Liang, Q. S. Li, Lin Zhao and Yaojun Ge

    In this paper, the along-wind, across-wind as well as torsional dynamic wind loads on three kinds of lattice tower models are investigated using the base balance technique in a boundary layer wind tunnel. The models were specially designed, and their fundamental frequencies in the directions of the three principal axes are still in the frequency range of the spectra of wind loads on lattice towers. In order to clear contaminations to the spectra of wind loads induced by model resonance, the generalized force spectra of the first mode of the models in along-wind, across-wind and torsional directions were derived based on measured base moments of the models. The RMS generalized force coefficients are also obtained by removing the contributions of model resonance. Finally, the characteristics of the 3-D dynamic wind loads, especially those of the across-wind dynamic loads, on the three kinds of lattice towers are presented and discussed.
Key Words
    lattice tower; wind load; wind tunnel test; generalized force spectrum.
Lianghao Zou and Shuguo Liang; School of Civil and Building Engineering, Wuhan University, Wuhan, 430072, P.R. China
Q. S. Li; Department of Building and Construction, City University of Hong Kong, Hong Kong
Lin Zhao and Yaojun Ge; Department of Bridge Engineering, Tongji University, Shanghai, 200092, P.R. China

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