Effect of shear span-to-depth ratio on shear strength components of RC beams

Hu, B and Wu, Y 2018, 'Effect of shear span-to-depth ratio on shear strength components of RC beams', Engineering Structures, vol. 168, pp. 770-783.

Document type: Journal Article
Collection: Journal Articles

Title Effect of shear span-to-depth ratio on shear strength components of RC beams
Author(s) Hu, B
Wu, Y
Year 2018
Journal name Engineering Structures
Volume number 168
Start page 770
End page 783
Total pages 14
Publisher Pergamon Press
Abstract The additive model of shear strength of reinforced concrete (RC) members, i.e. shear strength (V) is equal to the sum of the contribution from concrete (Vc) and that from transverse reinforcement (Vs), has been widely accepted in the literature and engineering practice. Shear span-to-depth ratio (a/d) is known to be a significant factor affecting V of RC members. However, very few quantitative studies on the influence of a/d on Vc and Vs have been reported in the literature. Another issue is related to the controversial relationship between the shear force at first diagonal cracking (Vcr) and Vc, for which different guidelines are given in ACI, AASHTO LRFD and CSA codes. Through direct measurement of Vc and Vs from 11 RC beam tests, this work provides experimental evidence for these issues. The experimental results show that Vc can be very different from Vcr. At small shear span-to-depth ratio (a/d), Vc is much larger than Vcr, while it is the opposite for beams with a large a/d value. Not all stirrups crossing the critical shear crack yield at ultimate shear strength, and Vc as well as Vs are not constant under increasing member deformation. Although design codes give a conservative prediction of V, they predict an un-conservative value of Vc at large a/d.
Subject Structural Engineering
Keyword(s) Contribution of concrete
Contribution of transverse reinforcement
Reinforced concrete beams
Shear strength
DOI - identifier 10.1016/j.engstruct.2018.05.017
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0141-0296
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