Stress Intensity Factors for Cracked Steel Girders Strengthened with CFRP Sheets
Publication: Journal of Composites for Construction
Volume 19, Issue 5
Abstract
This paper presents the fracture characteristics of cracked wide-flange steel girders (W18–W40, W460–W1000 in metric) strengthened with carbon fiber-reinforced polymer (CFRP) sheets. A broad range of parameters are considered to study their effects on the crack-tip stress intensity of the girders: flange-to-web area ratios, crack depth-to-height ratios, CFRP-to-steel area ratios, CFRP-to-steel modular ratios, and CFRP-bond widths. A three-dimensional finite-element approach is proposed and validated with a previously conducted experimental program. A total of 1,240 models, i.e., 40 unstrengthened and 1,200 strengthened girders, are used to evaluate the crack-tip behavior of the W-shape girders. The response surface-regression analysis procedures (RSREGs) are used to develop correction factors for the stress intensity of the girders. Stochastic simulations are conducted to probabilistically understand the vulnerability of the cracked girders and evaluate the efficacy of CFRP strengthening in terms of reducing stress intensity.
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Acknowledgments
The authors gratefully acknowledge financial support from North Dakota State University. Dr. G. Karami has advised the first author for formulating the fracture model used.
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Published In
Journal of Composites for Construction
Volume 19 • Issue 5 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 12, 2014
Accepted: Nov 20, 2014
Published online: Dec 24, 2014
Discussion open until: May 24, 2015
Published in print: Oct 1, 2015
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