Structural Fragility Behavior of Steel Lattice Power Transmission Tower Subjected to High-Intensity Wind Loading
DOI:
https://doi.org/10.31272/jeasd.3259Keywords:
Fragility curves, Nonlinear hinge properties, Performance-based wind design, Steel lattice tower, Time history analysis, Wind velocityAbstract
Transmission towers are indeed vital components of power transmission lines, but they also belong to the category of complex structural systems. The ultimate strength of this system can be highly compromised by strong wind forces that may act on it, and thus allow a situation where there is an outage in the event of storms. This paper presents a case study assessment for a steel lattice high-voltage transmission tower located within Iraq’s territory after experiencing extreme-intensity wind loads (tornado). An inelastic dynamic analysis was carried out to establish the effects of tornado wind loads on such types of structures. Two different approaches were adopted by this research; one based on performance per scaled full-scale model applying various independent intensities’ loadings, while the other used a constant, systematically scaled set of records representing different levels of intensities. A cross-validation methodology was used to acquire the dynamic stability of the lattice tower. The results showed that this high-intensity wind speed is greater than the minimum design loads of the latest development code for structures in this area. There is an urgent need to check on those transmission towers located within highly risky areas, as emphasized by this study.
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Copyright (c) 2026 HUSAIN KHALAF JARALLAH, Hayder Ali Abbas (Author)
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