Nonlinear Wind and Earthquake Loads on Tall Steel-Braced Frame Buildings
Publication: Journal of Structural Engineering
Volume 148, Issue 8
Abstract
Although time-domain response analyses have been commonly used in the design of tall buildings, the code-based wind design continues to rely on prescriptive static methods. Moreover, buildings subjected to both earthquakes and wind, where both are critical, could be prone to ineffective seismic response (increasing bottom-floor member sections due to wind demand reduces the system’s ductility) and noneconomic lateral force–resisting system (design for elastic response under wind loads). The incompatibility in the current building code when addressing the seismic and wind design such as: the consideration of different return periods for wind and earthquake; design for ductility under earthquake versus the elastic response under wind; and the governing lateral load for tall steel buildings of rectangular floor plans located in moderate-to-high seismic zones, are discussed herein. First, a design methodology for developing along-wind history series, generated from wind-tunnel pressure records available from the Tokyo Polytechnic University aerodynamic database, is provided. Then, incremental dynamic analyses under winds and earthquake loads are carried out independently in a case study, and insights into the collapse mechanisms are presented. The findings show that the annual failure probability under wind is greater than that under earthquakes.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Fonds de Recherche du Québec—Nature et Technologies (FRQNT) is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 8 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 6, 2021
Accepted: Feb 17, 2022
Published online: Jun 2, 2022
Published in print: Aug 1, 2022
Discussion open until: Nov 2, 2022
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