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PUBLICATIONS

Archetype CFS Wall Line Study: Exploring Influence of System Effects on Seismic Response

Published

Author(s)

Matthew Speicher, Zhidong Zhang, Benjamin Schafer

Abstract

Buildings repetitively framed with cold-formed steel (CFS) members often possess significant lateral overstrength due to contributions from components beyond the designated sheathed or strap-braced shear walls, including from the gravity framing, non-structural framing, and even non-structural finishes. Previous shake table tests have demonstrated this trend and illustrated how remiss it is to not take advantage of this response in the era of performance-based seismic design. This paper investigates lateral contributions from non-lateral force resisting systems by developing a suite of archetype wall lines. The archetype wall lines are derived using design drawings of 11 buildings collected from industry. The proportion of lateral force resisting shear walls, gravity walls, partition (non-structural) walls, and openings are collected to statistically inform the archetype space. Based on the hypothesis that the topology, or order, of the shear walls and non-lateral force resisting system walls within a wall line is of key interest, a suite of 64 wall line permutations was determined and associated nonlinear models were created. Nonlinear pushover analysis was then conducted on each archetype model. The simulations indicated that, if there was sufficient rigidity in the floor systems, the wall lines performance did not depend on the arrangement of components along the wall line, only on the total length of each component. Thus, for typical design a simple overstrength assessment based on the length and type of the non-lateral force resisting systems in a wall line may be utilized to reliably estimate building specific overstrength.
Proceedings Title
Proceedings of the 18th World Conference on Earthquake Engineering
Conference Dates
June 30-July 5, 2024
Conference Location
Milan, IT
Conference Title
18th World Conference on Earthquake Engineering
Pub Type
Conferences

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Keywords

CFS, steel, seismic, buildings, PBSD
Structural engineering, Earthquake risk reduction and Building codes and standards

Citation

Speicher, M. , Zhang, Z. and Schafer, B. (2024), Archetype CFS Wall Line Study: Exploring Influence of System Effects on Seismic Response, Proceedings of the 18th World Conference on Earthquake Engineering, Milan, IT, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956963 (Accessed April 30, 2025)

Issues

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Created June 30, 2024, Updated April 17, 2025