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Simplified Presentation of Uneven Downburst Load Case for Transmission Line Conductors
High-Intensity Wind (HIW) events, known as downbursts and tornadoes, have been identified as a major threat to transmission lines due to the frequently reported failures worldwide during those events. HIW events usually occur during thunderstorms, which are believed to have become more frequent recently due to global warming. Therefore, new load cases, representing the critical effect of downbursts and tornadoes on TL structures were incorporated into the ASCE-74 (2020) guideline, based on a 15-year research project conducted at the University of Western Ontario. One of the downburst critical load cases is when the downburst occurs at an oblique angle with respect to the transmission tower. The uneven transverse load distribution in this case produces a net longitudinal force transferred to the tower. The ASCE-74 (2020) guideline presents a set of charts that are used with a 3-D interpolation method to calculate this longitudinal force based on the conductor’s properties and the applied load. This paper aims to present a simplified method to calculate the net longitudinal force transferred to the tower due to the downburst oblique load case. The new approach is beneficial for practitioners in reducing the calculation’s time and effort.
Simplified Presentation of Uneven Downburst Load Case for Transmission Line Conductors
High-Intensity Wind (HIW) events, known as downbursts and tornadoes, have been identified as a major threat to transmission lines due to the frequently reported failures worldwide during those events. HIW events usually occur during thunderstorms, which are believed to have become more frequent recently due to global warming. Therefore, new load cases, representing the critical effect of downbursts and tornadoes on TL structures were incorporated into the ASCE-74 (2020) guideline, based on a 15-year research project conducted at the University of Western Ontario. One of the downburst critical load cases is when the downburst occurs at an oblique angle with respect to the transmission tower. The uneven transverse load distribution in this case produces a net longitudinal force transferred to the tower. The ASCE-74 (2020) guideline presents a set of charts that are used with a 3-D interpolation method to calculate this longitudinal force based on the conductor’s properties and the applied load. This paper aims to present a simplified method to calculate the net longitudinal force transferred to the tower due to the downburst oblique load case. The new approach is beneficial for practitioners in reducing the calculation’s time and effort.
Simplified Presentation of Uneven Downburst Load Case for Transmission Line Conductors
Lecture Notes in Civil Engineering
Desjardins, Serge (Herausgeber:in) / Poitras, Gérard J. (Herausgeber:in) / El Damatty, Ashraf (Herausgeber:in) / Elshaer, Ahmed (Herausgeber:in) / Ahmed, Abdelrahman (Autor:in) / Damatty, Ashraf El (Autor:in)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
13.12.2024
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Dynamic Characteristics of Transmission Line Conductors Under Downburst Loading
| British Library Conference Proceedings | 2008
| British Library Online Contents | 2010