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http://dx.doi.org/10.12989/was.2010.13.1.001

Assessment of capacity curves for transmission line towers under wind loading  

Banik, S.S. (Department of Civil and Environmental Engineering, University of Western Ontario)
Hong, H.P. (Department of Civil and Environmental Engineering, University of Western Ontario)
Kopp, Gregory A. (Department of Civil and Environmental Engineering, University of Western Ontario)
Publication Information
Wind and Structures / v.13, no.1, 2010 , pp. 1-20 More about this Journal
Abstract
The recommended factored design wind load effects for overhead lattice transmission line towers by codes and standards are evaluated based on the applicable wind load factor, gust response factor and design wind speed. The current factors and design wind speed were developed considering linear elastic responses and selected notional target safety levels. However, information on the nonlinear inelastic responses of such towers under extreme dynamic wind loading, and on the structural capacity curves of the towers in relation to the design capacities, is lacking. The knowledge and assessment of the capacity curve, and its relation to the design strength, is important to evaluate the integrity and reliability of these towers. Such an assessment was performed in the present study, using a nonlinear static pushover (NSP) analysis and incremental dynamic analysis (IDA), both of which are commonly used in earthquake engineering. For the IDA, temporal and spatially varying wind speeds are simulated based on power spectral density and coherence functions. Numerical results show that the structural capacity curves of the tower determined from the NSP analysis depend on the load pattern, and that the curves determined from the nonlinear static pushover analysis are similar to those obtained from IDA.
Keywords
Transmission tower; wind load; nonlinear static pushover analysis; incremental dynamic analysis; capacity curve;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 1
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