Fracture Mechanics Model for Analysis of Plain and Reinforced High-Performance Concrete Beams
Publication: Journal of Engineering Mechanics
Volume 131, Issue 8
Abstract
In developing a one-dimensional analysis and design procedure for reinforced concrete structures, research is generally based on yield phenomena and the plastic flow of steel in tension and concrete in compression. The ability of concrete to resist tension is considered in the form of tension stiffening or is completely disregarded. This procedure does not account for the influence of structural size in changing the failure mode and the stress distribution across the uncracked or cracked ligament. The key factor affecting this stress distribution is found to be the strain-softening modulus. This paper presents an improved model that is based on the fundamental equilibrium equation for the progressive failure of plain concrete beams. The concrete stress-strain relationship in tension is derived by calculating the peak tensile stress and softening modulus for different depths of beams on the basis of the fracture parameters obtained with the size effect law. Thus, the proposed model uses the peak tensile stress and the softening modulus, which vary depending on the size of the beam. To study the effect of the strength of high-performance concrete (HPC) on the concrete tensile stress-strain relationship, the experimental load-deflection plots of different-sized beams are compared with those obtained by using the proposed analytical model for eight different mixes made with locally available fly ash and slag. The model is also extended for lightly reinforced concrete beams, and the results are compared with those in the literature and are found to be in good agreement.
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Acknowledgment
The paper is published with the permission of the Director, Structural Engineering Research Centre (SERC), Chennai, India. The authors wish to thank the staff of Concrete Composites Laboratory and the Fatigue Testing Laboratory of SERC, Chennai, for their cooperation during the various stages of this investigation.
References
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 131 • Issue 8 • August 2005
Pages: 831 - 838
Copyright
© 2005 ASCE.
History
Received: Dec 2, 2003
Accepted: Nov 22, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
Notes
Note. Associate Editor: Majid T. Manzari
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