Seismic Collapse Response of Steel Moment Frames with Deep Columns
Publication: Journal of Structural Engineering
Volume 144, Issue 9
Abstract
The seismic collapse behavior of 4-story and 8-story steel special moment frames (SMFs) with deep columns is investigated using computational simulation. The models used are capable of modeling local and global instabilities and explicitly representing both sidesway and vertical collapse behaviors. Three key factors that affect the collapse potential of the frames are studied: (1) column lateral bracing; (2) level of column gravity load; and (3) column section properties. It is shown that, even when they satisfy current seismic provisions, deep columns can suffer early global instability, leading to vertical system collapse at relatively low drift levels. The findings indicate that the performance of moment frames can be improved by limiting the axial load levels on exterior columns, carefully selecting member sizes to limit depth-thickness and overall slenderness of the columns, and providing adequate lateral bracing. It is suggested that column shortening, in itself, is a benign effect that does not compromise serviceability or contribute to the collapse of a well-designed frame.
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Acknowledgments
This work was supported by the University of Michigan and US NSF Grant Nos. CMMI-1344372 and ACI-1638186. 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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Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 31, 2017
Accepted: Mar 26, 2018
Published online: Jun 25, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 25, 2018
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