Article (Scientific journals)
A simplified kinematic approach for the shear strength of fibre-reinforced concrete deep beams
Mihaylov, Boyan; Rajapakse Mudiyanselage, Chathura Madushanka
2020In Structural Concrete, doi.org/10.1002/suco.201900461
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Keywords :
deep beams; shear; fibre-reinforced concrete; kinematic model
Abstract :
[en] Deep beams with shear span-to-depth ratios a/d ≤ 2.5 are used to resist large shear forces due to their ability to develop direct strut action. To further enhance the shear strength and crack control of such members, researchers have studied the use of fibre-reinforced concrete (FRC). However, while this solution is promising, there is a need for rational mechanical models capable of predicting the shear strength of FRC deep beams in a sufficiently simple manner. This paper proposes such a mod-el based on first principles: kinematics, equilibrium and consti-tutive relationships. The proposed model simplifies an earlier two-parameter kinematic theory (2PKT) for the complete shear behavior of FRC deep beams, to predict the shear strength and components of shear resistance in a straightforward manner. The new simplified method (S2PKT) is validated by compar-ing the predicted results to 22 tests from the literature, as well as to FEM and 2PKT predictions. It is shown that the proposed simplified kinematic approach predicts well the shear strength with an average experimental-to-predicted shear strength ratio of 1.12 and a coefficient of variation of 12.9%. Furthermore, the model is used to discuss the effect of shear span-to-depth ratio and fibre volumetric ratio on the shear strength of FRC deep beams.
Disciplines :
Civil engineering
Author, co-author :
Mihaylov, Boyan ;  Université de Liège - ULiège > Département ArGEnCo > Structures en béton
Rajapakse Mudiyanselage, Chathura Madushanka  ;  Université de Liège - ULiège
Language :
English
Title :
A simplified kinematic approach for the shear strength of fibre-reinforced concrete deep beams
Alternative titles :
[en] Belgium
Publication date :
2020
Journal title :
Structural Concrete
ISSN :
1464-4177
eISSN :
1751-7648
Publisher :
Wiley-Blackwell, Chichester, United Kingdom
Volume :
doi.org/10.1002/suco.201900461
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 May 2020

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