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Determining Mean Recurrence Intervals for Updated Wind Maps in ASCE 7-16



Therese P. McAllister, Naiyu Wang, Bruce Ellingwood


ASCE Standard 7 is moving toward load requirements that are consistent with reliability-based design goals characteristic of performance-based engineering (PBE). As part of this move, reliability analyses were conducted using updated wind data to determine wind speed return periods necessary to meet the target reliability goals currently found in ASCE 7. A key part of this analysis was a re-examination of the role played by wind directionality on structural reliability. Analyses of wind load combinations in the early 1980s conducted to support the first-generation of strength load combinations in ANSI A58/ASCE 7 determined member reliabilities that apparently were lower than those for gravity load combinations, creating a controversy that up to this time has not been resolved. Using a wind directionality factor based on recent research leads to increased reliabilities for wind load combinations. Adoption of the new wind maps in ASCE 7 at the recommended return periods will achieve wind load reliabilities that are comparable reliability to those for gravity load criteria in extratropical regions. The recommended wind map return periods are 300, 700, 1700, and 3000 years for Category I, II, II and IV, respectively.
Journal of Structural Engineering-ASCE


wind, directionality, design, return period, reliability


McAllister, T. , Wang, N. and Ellingwood, B. (2018), Determining Mean Recurrence Intervals for Updated Wind Maps in ASCE 7-16, Journal of Structural Engineering-ASCE, [online], (Accessed July 21, 2024)


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Created February 16, 2018, Updated March 7, 2018