Evaluation of Seismic Deflection Amplification Factor for Buildings Utilizing Cold-Formed Steel–Framed Shear Walls
Publication: Journal of Structural Engineering
Volume 149, Issue 7
Abstract
The seismic deflection amplification factor for a series of archetype buildings utilizing cold-formed steel–framed shear walls was investigated. A total of 118 archetype buildings were considered, of which 83 employed cold-formed steel–framed shear walls with steel sheet sheathing, and 35 employed wood structural panel sheathing. Using nonlinear equivalent single-degree-of-freedom (SDOF) models, nonlinear time-history analyses for the 118 archetype buildings subjected to the 44 FEMA P-695 earthquakes were conducted. In these SDOF models, the actual response of shear walls obtained from experimental studies was used to define the nonlinear material parameters. The AISI S400 deflection expression was evaluated using experimental data, and numerically predicted deflection amplification factors were calculated and compared against that recommended in current practice. The results show that current practice may overestimate expected deflections. To address this issue, and to simplify design, a linearization of the AISI S400 deflection expression is recommended. With appropriate choice of the force level, the linearized AISI S400 deflection expression leads to acceptable drift predictions with the currently employed deflection amplification factor.
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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
This work is funded by the American Iron and Steel Institute (AISI) and the Steel Framing Industry Association (SFIA). The work also is partially funded by the National Science Foundation under Grant Nos. 1663348 and 1663569 as a part of the research project “Seismic Resiliency of Repetitively Framed Mid-Rise Cold-Formed Steel Building (CFS-NHERI).” The numerical work conducted herein was assisted by Zhidong Zhang, Astrid Fischer, Kara Peterman, Tara Hutchinson, and the whole CFS-NHERI team; the authors express gratitude for their great help.
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© 2023 American Society of Civil Engineers.
History
Received: Aug 17, 2022
Accepted: Feb 14, 2023
Published online: Apr 21, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 21, 2023
ASCE Technical Topics:
- Cold-formed steel
- Continuum mechanics
- Displacement (mechanics)
- Earthquake engineering
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Geotechnical engineering
- Materials engineering
- Metals (material)
- Nonlinear analysis
- Seismic effects
- Seismic tests
- Shear walls
- Solid mechanics
- Steel
- Steel structures
- Structural analysis
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Structures (by type)
- Tests (by type)
- Walls
- Wood structures
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