Strut-and-Tie Model Based on Crack Band Theory for Deep Beams
Publication: Journal of Structural Engineering
Volume 137, Issue 10
Abstract
A simplified strut-and-tie model including size effect based on the crack band theory is proposed to evaluate the shear capacity of deep beams. Concrete struts are idealized as uniformly tapered prismatic members with a stress relief strip whereas horizontal and vertical shear reinforcements are assumed to be an internally statically indeterminate system. The shear transfer mechanism of concrete and shear reinforcement is then driven by using the energy equilibrium in the stress relief strip and crack band zone of concrete struts. The shear capacity predictions of deep beams obtained from the present models are in better agreement with 637 test results than those determined from strut-and-tie models proposed by ACI 318-08, EC-2, and Tan and Cheng. In addition, the trend of the shear capacity of deep beams against different parameters as predicted by the present models has a consistent agreement with that observed from experimental results. In particular, the present model shows that the normalized shear capacity of deep beams is proportional to , where = section overall depth.
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Acknowledgments
This work was supported by a grant from the Korean Ministry of Education, Science, and Technology (The Regional Core Research Program/Bio-housing Research Institute).
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Published In
Journal of Structural Engineering
Volume 137 • Issue 10 • October 2011
Pages: 1030 - 1038
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 2, 2009
Accepted: Oct 24, 2010
Published online: Dec 3, 2010
Published in print: Oct 1, 2011
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