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Journal of Structural Engineering / Volume 137 / Issue 12 / TECHNICAL PAPERS

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Formulation of a Shear Resistance Mechanism for Inclined Cracks in RC Beams

J. Struct. Eng. 137, 1480 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000382 (9 pages)

W. Lucas1, D. J. Oehlers2, and Mohamed Ali3

1Former Ph.D. Student, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, South Australia 5005, Australia.
2Professor, School of Civil, Environmental and Mining Engineering, University of Adelaide, South Australia 5005, Australia (corresponding author). E-mail: doehlers@civeng.adelaide.edu.au
3Senior Lecturer, School of Civil, Environmental & Mining Engineering, Univ. of Adelaide, South Australia 5005, Australia.

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(Submitted 3 July 2009; accepted 7 January 2011; posted ahead of print 10 January 2011)

The shear capacity of reinforced concrete (RC) members is often associated with sliding across inclined planes often referred to as critical diagonal cracks. However, quantifying the shear capacity of the RC member in terms of the sliding resistance of an inclined plane as a result of shear-friction has been found to be a very complex problem. This is because these sliding planes transcend both initially cracked and uncracked planes, their capacity is also a function of the separation between these sliding planes, and invariably the shear-friction sliding capacity overestimates the shear capacity of the member. In this paper, a structural mechanics model that incorporates shear-friction is developed for quantifying the various components of the shear resistance across a critical diagonal crack because of both longitudinal reinforcement and stirrups. It is shown that the shear resistance is less than would be anticipated from the direct application of shear-friction theory because the compressive force in the uncracked region of concrete is less than can be anticipated and because the shear resistance must provide shear forces to maintain equilibrium prior to resisting the direct shear force.

© 2011 American Society of Civil Engineers

Article Outline

  1. Introduction
  2. Shear-Friction Model for No Stirrups
    1. Flexural Deformation
    2. Shear Deformation
  3. Shear-Friction Model with Stirrups
    1. Flexural Deformation
    2. Shear Deformation
  4. General Behavioral Trends
    1. Without Stirrups
    2. With Stirrups
    3. Illustrations
    4. Comparison
  5. Summary

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ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000382

PUBLICATION DATA

ISSN

0733-9445 (print)  
1943-541X (online)

Publisher

American Society of Civil Engineers

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