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Collapse estimates of U.S. code-compliant steel frames and implications for an ASCE 41 assessment

Published

Author(s)

Matthew Speicher, Kevin K F Wong, Jazalyn Dukes

Abstract

ASCE 41 is a standard that contains performance-based engineering procedures sometimes used to assess and retrofit existing structures. In 2015, the U.S. National Institute of Standards and Technology completed a study investigating the relationship between ASCE 41 and traditional new building design standards. A key observation from this study was that there are inconsistencies between the two approaches, some of which may be caused by suspected conservatism in the ASCE 41. To further investigate this relationship, this study will present the results of a FEMA P695 assessment of a set of six steel special moment frames. The goal is to verify that the ASCE 7 design intent of no greater than 10 % probability of collapse given a risk-targeted maximum considered earthquake is being met. The effects of various modeling assumptions, such as backbone curves, damping, and p-delta columns, are discussed. The sensitivity of these modeling approaches is summarized, and it is found that consideration of the beam-slab composite action is most significant. Furthermore, the tendency for conservative assumptions for one component resulting in non-conservative results for another component is highlighted. It is expected this study will provide useful and timely information to engineers and standards committee members charged with improving performance-based seismic design approaches.
Proceedings Title
17th World Conference on Earthquake Engineering
Conference Dates
September 13-18, 2020
Conference Location
Sendai, JP

Keywords

Performance-based design, ASCE 41, collapse, FEMA P695, steel moment frames

Citation

Speicher, M. , Wong, K. and Dukes, J. (2021), Collapse estimates of U.S. code-compliant steel frames and implications for an ASCE 41 assessment, 17th World Conference on Earthquake Engineering, Sendai, JP, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929686 (Accessed May 23, 2022)
Created September 29, 2021, Updated October 14, 2021