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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 75
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar
Paper 121
A Design Equation for Predicting the Shear Strength of Short Beams P.G. Bakir and M.H. Boduroglu
Department of Civil Engineering, Istanbul Technical University, Turkey Full Bibliographic Reference for this paper
P.G. Bakir, M.H. Boduroglu, "A Design Equation for Predicting the Shear Strength of Short Beams", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 121, 2002. doi:10.4203/ccp.75.121
Keywords: short beams, shear strength, reinforced concrete, structural design, span to depth ratio.
Summary
Reinforced concrete short beams and deep beams are often used in tall building
construction, offshore structures, and complex foundation systems. In spite of their
widespread use, both the BS8110 [1] and the EC2 [2] do not provide any special
design provisions for short beams. In practice the beams that have
![]() ![]() Currently, the main design documents for deep beams are the ACI 318-95 [3], the Canadian Code CAN-A23.3-M84 [4] and the CIRIA Guide of the UK [5]. Among the three design requirements, the CIRIA Guide is the most extensive guide on the subject. The guide gives good fit to the normal strength short beams that have shear span to depth ratios less than 0.9. The Canadian Code is based on the strut and tie modelling approach and incorporates the softening of the concrete stresses due to increasing principal tensile strain. The Canadian Code then stipulates some maximum allowable stresses for the nodal regions. A previous study [6] shows that none of these codes gives reliable estimates of the shear strengths of short beams. The mean values are usually very low and the standard variations are too high. Thus a more conservative estimate of the shear strength of short beams is required.
In order to achieve this, several short beam tests without shear reinforcement is
brought together. The database consists of beams that have Based on these parametric studies, a design equation is proposed for predicting the shear strength of short beams without shear reinforcement as shown in Equation (121.1). where: ![]() ![]() ![]() ![]() ![]() The proposed design equation is applied on the experimental database. It is apparent that the proposed equation gives very accurate predictions of the shear strength of short beams without shear reinforcement with minimal standard deviation. References
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