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Wind and Structures
  Volume 38, Number 4, April 2024 (Special Issue) pages 325-339

Longitudinal reaction on conductors due to tornado wind load
Dingyu Yao and Ashraf El Damatty

    The longitudinal force resulting from tornado loads on transmission line is considered a crucial factor contributing to the failure of transmission line structures during tornado events. Accurate estimation of this longitudinal force poses a challenge for structural designers. Therefore, the objective of this paper is to provide a set of charts that can be easily used to estimate the peak longitudinal forces transferred from the conductors to a tower. The critical wind field and corresponding configuration considered in this paper are previously studied and determined. The charts should account for all the conductor parameters that can affect the value of the longitudinal force. In order to achieve that, a parametric study is first conducted to assess the variation of the longitudinal forces with different conductor parameters, based on the critical tornado configuration. Results of this parametric study are used to develop the charts that can be used to calculate longitudinal forces by adopting a multi-variable line regression. The forces calculated from charts are validated by finite element analysis. An example for the usage of the charts is provided at the end of this paper.
Key Words
    conductor; longitudinal force; tornado; transmission line system
Dingyu Yao:Department of Civil and Environmental Engineering, Western University, London, ON, Canada

Ashraf El Damatty:1)Department of Civil and Environmental Engineering, Western University, London, ON, Canada
2)WindEEE Research Institute, Western University, London, ON, Canada

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