System Reliability of Floor Diaphragms Framed from Cold-Formed Steel with Wood Sheathing
Publication: Journal of Structural Engineering
Volume 144, Issue 2
Abstract
A high-fidelity simulation-based system reliability calculation methodology was implemented for steel floor diaphragms framed from cold-formed steel joists topped with wood sheathing, leading to design recommendations that consider the sensitivity of the system performance to fastener component reliability and load paths provided by the sheathing and steel. Diaphragm structural response under in-plane equivalent lateral seismic forces was obtained from high-fidelity computational simulations verified with a full-scale diaphragm test. The model included sheathing-to-joist and joist-to-ledger connection load-slip nonlinearities and randomness from the bearing, tilting, and screw shear, obtained from independent and isolated fastener tests. An uncertainty-modeling scheme provided a statistical distribution for the diaphragm system capacity, which was used to calculate the diaphragm system reliability. The variation in diaphragm system reliability with the fastener component reliability, i.e., the reliability sensitivity, was quantified to guide the diaphragm design to a predefined system-reliability target.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grants 1301001 (Virginia Tech), 1301033 (University of Massachusetts, Amherst), and 1300484 (Johns Hopkins University). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors are grateful to their industry partner, the American Iron and Steel Institute, for their cooperation, and to Virginia Tech Advanced Research Computing for the supercomputing resources used in the finite element simulations.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 2 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 30, 2016
Accepted: Aug 3, 2017
Published online: Dec 8, 2017
Published in print: Feb 1, 2018
Discussion open until: May 8, 2018
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