Longitudinal force on transmission towers due to non-symmetric downburst conductor loads

Elawady, Amal; Damatty, Ashraf El

doi:10.1016/j.engstruct.2016.08.030

Cited by 19 publications

(9 citation statements)

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“…As such, Elawady and El Damatty (2016) conducted an elaborate parametric study to find the configuration resulting in the highest longitudinal loading. To do so, the authors utilized the technique described by to compute the reactions on a six-span conductor system.…”

Section: Problem Definitionmentioning

confidence: 99%

“…While Aboshosha et al (2016), Lin et al (2012), Shehata et al (2005), Shehata and El Damatty (2007), El Damatty (2011), andElawady et al (2017) considered the combined tower-line system, Mara et al (2010), Mara and Hong (2013), and Savory et al (2001) have considered the effect of downburst loading on the supporting tower structures alone with no regard for the conductors. On the other hand, Aboshosha and El Damatty (2014a,b); Aboshosha and El Damatty (2015b), Darwish et al (2010), and Elawady and El Damatty (2016) have focused on the conductors, studying their impact either on the loading process, or their aerodynamic damping. The current study is an extension of the work performed by Elawady and El Damatty (2016).…”

Section: Introduction Backgroundmentioning

confidence: 99%

“…On the other hand, Aboshosha and El Damatty (2014a,b); Aboshosha and El Damatty (2015b), Darwish et al (2010), and Elawady and El Damatty (2016) have focused on the conductors, studying their impact either on the loading process, or their aerodynamic damping. The current study is an extension of the work performed by Elawady and El Damatty (2016). It examines the limitations associated with the analysis of Elawady and El Damatty (2016), the validity of their assumptions, and finally the applicability of the wind field used.…”

Section: Introduction Backgroundmentioning

confidence: 99%

“…The current study is an extension of the work performed by Elawady and El Damatty (2016). It examines the limitations associated with the analysis of Elawady and El Damatty (2016), the validity of their assumptions, and finally the applicability of the wind field used. Elawady and El Damatty (2016), complimented a series of previous studies that investigated the effect of downburst loading on transmission line systems.…”

Section: Introduction Backgroundmentioning

confidence: 99%

“…It examines the limitations associated with the analysis of Elawady and El Damatty (2016), the validity of their assumptions, and finally the applicability of the wind field used. Elawady and El Damatty (2016), complimented a series of previous studies that investigated the effect of downburst loading on transmission line systems. The studies performed by Darwish and El Damatty (2011) and Shehata and El Damatty (2007) looked into the effect of the localized nature of downburst loading on transmission line systems.…”

Section: Introduction Backgroundmentioning

confidence: 99%

See 4 more Smart Citations

The Dynamic Effect of Downburst Winds on the Longitudinal Forces Applied to Transmission Towers

Ibrahim

Damatty

Elawady

2019

Front. Built Environ.

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Electric power transmission line systems are a key component in the development of our modern societies. The uninterrupted availability of electric power mandates building transmission line structures that can withstand severe natural hazards. The current study focuses on the performance of conductor line systems subjected to downburst loading, which along with other types of wind events are responsible for 80% of weather related failures of transmission lines. Due to the special configuration of downburst wind fields, a unique failure mode of transmission line structures can be found to damage the cross-arms of the supporting towers as a result of the development of longitudinal forces in the conductor lines. The main concern of the current study is to explore the dynamic effect of downburst loading on these longitudinal forces, and to examine the validity of using quasi-static analysis. This is done through two levels of analysis, model-scale and full-scale. The model-scale analysis is first used to propose a simulation technique that can predict the dynamic response of conductor systems due to downburst loading overcoming the complexity induced by time varying aerodynamic damping coefficients. The proposed model is validated using a unique experiment conducted at WindEEE dome testing facility at The University of Western Ontario in Canada. The validated model is used to conduct analysis at the full-scale level using a wind field generated by a Computational Fluid Dynamics (CFD) model. Results show that the longitudinal forces within the conductor system are dynamically insensitive and can therefore be treated quasi-statically. Lastly, to judge the applicability of the wind field used, a comparison was made between the CFD wind field and full-scale records. The comparison was done through two parameters that would affect the quasi-static response; the first relating the peak velocity to the post peak velocity, and the second defining the ramping period. It was concluded from the comparison that varying the defined parameters would result in a maximum difference of 5% in the computed reactions.

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Section: Problem Definitionmentioning

confidence: 99%