Equivalent static wind loads on snow-accreted overhead wires

Hisato Matsumiya*, Saki Taruishi, Mikio Shimizu, Go Sakaguchi, John H G Macdonald

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
2 Downloads (Pure)

Abstract

The effects of structural and aerodynamic non-linearity on dynamic wind loads on overhead wires have been investigated. According to the Japanese design standards for transmission structures, wind loads on overhead wires are determined using equivalent static wind loads that can be used to estimate the maximum responses under dynamic loads. Some assumptions of linear theory are necessary to derive the equivalent static wind loads, and they have been validated only in the case of strong winds. To derive equivalent static wind loads in the case of weaker winds for snow-accreted conditions, time history response analyses of overhead wires have been performed. Because the turbulence intensity becomes higher in weaker winds, aerodynamic non-linearity causes the wind loads on the wires to become larger. Furthermore, structural non-linearity causes the tension in the wires to become greater. The contribution of wire resonance to dynamic load increases when the wind speed is low, and the gust response factor becomes greater than the value derived considering only the quasi-static response caused by wind turbulence. Taking into consideration the two major effects of aerodynamic and structural non-linearity, a modified method is proposed to enable the use of a design method based on equivalent static wind loads.
Original languageEnglish
Pages (from-to)78-91
Number of pages14
JournalStructural Engineering International
Volume32
Early online date5 Oct 2021
DOIs
Publication statusE-pub ahead of print - 5 Oct 2021

Bibliographical note

Publisher Copyright:
© 2021 International Association for Bridge and Structural Engineering (IABSE).

Keywords

  • Equivalent static wind loads
  • Transmission towers
  • Overhead wires
  • Snow accretion
  • Weaker winds

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