Flexural Resistance of Longitudinally Stiffened I-Girders. I: Yield Limit State
Publication: Journal of Bridge Engineering
Volume 22, Issue 1
Abstract
The current AASHTO specification requirements for the web bend-buckling strength-reduction factor (Rb) do not consider the influence of longitudinal stiffeners on the flexural resistance of steel I-girders subsequent to the theoretical bend-buckling of a slender web. This is a deficiency that can have significant impact, especially in regions of continuous-span girders subjected to negative moment. This paper evaluates the contribution of single-web longitudinal stiffeners to the yield limit state flexural resistance of slender-web steel I-girders, often referred to as the plateau resistance for the lateral torsional and flange local buckling limit states. Based on test simulation studies, the authors recommend a cross-section model that captures the response of the postbuckled web for both homogeneous and hybrid girders subjected to uniform moment. The proposed model offers up to 60% improvement relative to the current AASHTO specifications.
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Acknowledgments
This research was funded by the American Iron and Steel Institute, and the AASHTO. The financial support from these organizations and the Georgia Institute of Technology is gratefully acknowledged. The opinions, findings, and conclusions expressed in this paper are those of the writers and do not necessarily reflect the views of the aforementioned organizations.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 22 • Issue 1 • January 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 28, 2016
Accepted: Jun 20, 2016
Published online: Aug 26, 2016
Published in print: Jan 1, 2017
Discussion open until: Jan 26, 2017
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