Influence of Seismic Design Evolution on the Seismic Collapse Behavior and Losses of Prototype Steel Buildings with Moment-Resisting Frames
Publication: Journal of Structural Engineering
Volume 146, Issue 9
Abstract
Seismic design provisions for steel moment frame buildings have undergone substantial changes over the past half century. Despite the anticipated benefits of enforcing newer codes, it is not yet fully known how the evolution of seismic provisions has changed the risk associated with steel moment frame use. To address this shortcoming, a seismic loss assessment is performed for two-, four, and eight-story prototype steel moment frames designed using seismic provisions from three eras spanning the past half century. Frames of different vintages differ significantly in material properties, welding practices, connection types, seismic lateral force used for design, and panel zone design philosophy. High-fidelity models capable of explicitly capturing instabilities and fracture are employed to determine the effect of the differences in these designs. The simulation results show that although the collapse risk decreased as the codes evolved, the collapse probability of frames designed to the latest specifications still exceed the expected norms. Analysis of the four-story frames showed that the effect of brittle fracture in the welds of pre-Northridge connections on frame collapse capacity is modest. However, it is quite influential on economic and social losses for the level of seismic hazard considered. The assessment results are used to propose strategies for reducing the seismic losses of communities with steel buildings.
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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 work was supported by the University of Michigan and US NSF grant numbers ACI-1638186. An academic license of the SP3 Design (www.hbrisk.com) was used in the performance of this work. Any opinions, findings, conclusions, and recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsor.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 3, 2019
Accepted: Mar 12, 2020
Published online: Jun 25, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 25, 2020
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