Engineering Review of Wind-Induced Torsional Moment and Response of Buildings
Publication: Journal of Structural Engineering
Volume 149, Issue 11
Abstract
For building service and strength design under wind load, torsional moment and response (or torsional-wind load) is a main component. Several factors contribute to torsional-wind load, including asymmetric distribution of wind pressure on the building façade (aerodynamic source), dynamic torsional vibration, and the contribution of resonant components of along-wind and across-wind loads in presence of mass-stiffness eccentricity. In addition, adjacent building influence can be considerable. For low (1 or 2 stories) to midrise (less than 10 stories) buildings, the main component in torsional-wind load typically is aerodynamic source. For tall buildings, contribution due to all sources is significant. In this article, theoretical background and procedures to calculate torsional-wind load, with a focus on the concept of equivalent eccentricity and equivalent static wind load, are discussed. Then, procedures and perspectives in several international standards, including ASCE 7-22, Architectural Institute of Japan-recommendations for loads on buildings (AIJ-RLB-2015), Australian and New Zealand Standard (AS/NZS 1170.2-2011), Korean Design Standard (KDS 41-2019), and ISO 4354-2009, are introduced to clarify differing points of view and how components of torsional-wind load are included. Finally, the main parameters of each standard are compared with wind tunnel test results. The results confirm consistency between the wind tunnel test results and those based on the standards with consideration of their covered ranges.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by National Research Foundation of Korea (No. 2021R1D1A1B06044752) and by the Institute of Construction and Environmental Engineering at Seoul National University. The views expressed are those of the authors, and do not necessarily represent those of the sponsors.
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Journal of Structural Engineering
Volume 149 • Issue 11 • November 2023
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Published online: Sep 12, 2023
Published in print: Nov 1, 2023
Discussion open until: Feb 12, 2024
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