Shear Strength Model for Steel Fiber Reinforced Concrete Beams without Stirrup Reinforcement
Publication: Journal of Structural Engineering
Volume 137, Issue 10
Abstract
A simple model is presented to estimate the shear strength of steel fiber reinforced concrete (FRC) beams without stirrup reinforcement. The model was developed on the basis of observations from tests of 27 large-scale beams under monotonically increased concentrated loading. Three types of hooked steel fibers were evaluated in volume fractions ranging between 0.75% ( or ) and 1.5% ( or ). All but one beam failed in shear either prior to or after flexural yielding. In the proposed model, shear in steel FRC beams is assumed to be resisted by shear stress carried in the compression zone and tension transferred across diagonal cracks by steel fibers. Shear carried in the compression zone is estimated by using the failure criterion for concrete subjected to combined compression and shear proposed by Bresler and Pister. The contribution from fiber reinforcement to shear strength, on the other hand, is tied to material performance obtained through standard ASTM 1609 four-point bending tests. Comparison of predicted versus experimental shear strengths for a large number of FRC beams tested in this and other investigations indicates that the proposed model is capable of predicting the shear strength of steel FRC beams with reasonable accuracy; mean and standard deviation values are 0.79 and 0.12, respectively.
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Acknowledgments
The writers would like to acknowledge the support of Bekaert Corporation, which donated the hooked steel fibers used in this investigation.
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Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 10 • October 2011
Pages: 1039 - 1051
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 10, 2010
Accepted: Dec 15, 2010
Published online: Dec 17, 2010
Published in print: Oct 1, 2011
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