Compression Model for Ultimate Postbuckling Shear Strength at Elevated Temperatures
Publication: Journal of Structural Engineering
Volume 143, Issue 6
Abstract
Tension field theory assumes that after elastic shear buckling has occurred, compressive stresses in the web plate do not increase; therefore, postbuckling shear strength solely results from the development of tensile stresses within a defined diagonal tension field. Finite-element analyses have found this fundamental assumption to be invalid and a new theory (compression theory) was proposed that bases the development of postbuckling shear strength mostly on the compressive response of the plate (tension plays a secondary role). Previous work has validated compression theory against a wide variety of published experimental data at ambient temperature. This paper shows that compression theory can predict the ultimate postbuckling shear strength of steel web plates up to temperatures of 1,100°C. This finding is significant because steel plate girders subjected to fire loading are highly susceptible to web shear buckling. Experimentally validated finite-element models are used to develop temperature-dependent multiplicative parameters to permit the use of compression theory to calculate ultimate postbuckling shear strength at elevated temperatures. Comparisons with published experimental data show that predictions of ultimate postbuckling shear strength from compression theory closely agree with the literature.
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Acknowledgments
The authors would like to acknowledge Theodore Zoli from HNTB Corporation and Dr. Jean-Herve Prévost from Princeton University for their insights in the development of the proposed model. This research was made with Government support under and awarded by DoD, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a, provided to Dr. Glassman. This research was also sponsored by the National Science Foundation (NSF) under grant CMMI-1068252. All opinions, findings, and conclusions expressed in this paper are of the authors and do not necessarily reflect the policies and views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 6 • June 2017
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©2017 American Society of Civil Engineers.
History
Accepted: Oct 27, 2016
Published online: Feb 14, 2017
Received: May 10, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 14, 2017
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