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Wind and Structures Volume 41, Number 6, December 2025 , pages 451-463 DOI: https://doi.org/10.12989/was.2025.41.6.451 |
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Wind-induced responses of transmission towers: A parametric study using time and frequency domain methods |
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Guohui Shen, Hangcong Yu, Yingneng Zhao, Liang Yu and Buhui Li
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| Abstract | ||
| The wind-induced responses of the transmission towers obtained using time and frequency domain methods were investigated and compared. The influence of key parameters, including the cut-off frequency ωu, time step, sampling period, and frequency amount N, on the simulating results was clarified in the process of the harmonic superposition method (HSM). Furthermore, the effects of the wind spectrum and coherence function on the transmission towers' responses are examined. Finally, the appropriate values for the cut-off frequencies for obtaining the displacement and acceleration responses were provided. In the process of HSM, it is recommended to use a time step of 2π/2ωu. Otherwise, the high-frequency component of the simulated spectrum will be distorted or inadequate if a larger or smaller time step is applied. The recommended sampling length is 2πN/ωu. Using a great sampling length will result in a repeating time history. If the cut-off frequencies used in the HSM of the time domain analysis and the upper limit of the integral in the frequency domain analysis are the same, the displacements of the two approaches are almost equal. In terms of acceleration, the responses at the cut-off frequency prior to and following the first-order circular frequency differ significantly. Suggestions for cut-off frequency selection are made based on response type. For the displacement response, the cut-off frequency should be more than the first-order circular frequency, while for the acceleration response, it should be at least 8π. The coherence function has a significant effect on the response, with the frequency-independent coherence function yielding greater standard deviations for both displacement and acceleration than the frequency-dependent model. | ||
| Key Words | ||
| cut-off frequency; frequency domain method; harmonic superposition method; time domain method; transmission tower | ||
| Address | ||
| Guohui Shen: Institute of Structural Engineering, Zhejiang University, Hangzhou, China Hangcong Yu:The Architectural Design and Research Institute of Zhejiang University Co., Ltd. Hangzhou, China Yingneng Zhao:China Energy Engineering Group Zhejiang Power Design Institute Co. Ltd, Hangzhou, China Liang Yu:China Energy Engineering Group Jiangsu Power Design Institute Co. Ltd, Nanjing, China Buhui Li:China Energy Engineering Group Jiangsu Power Design Institute Co. Ltd, Nanjing, China | ||