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A new protocol for testing RC beams in combined shear and tension loading conditions

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Abstract

The problem of the shear strength of reinforced concrete members which are simultaneously subjected to an axial tension occurs in a number of practical cases such as continuous beams rigidly connected to columns (where tension results from the restraint of the axial variation of length due to concrete shrinkage and temperature variation), columns or shear walls and foundation piles in beam-column or shear wall-slab frames subjected to high horizontal forces. An original protocol is proposed for testing in these loading conditions, where reaching shear failure represents the main difficulty for designing specimens. This protocol makes use of an original and reliable test setup, in which two horizontal forces are symmetrically applied apart the beam axis, making it possible to generate a constant axial force and a constant negative bending moment along span. The loading protocol is oriented towards a defined value of axial force, while shear at failure may be combined with a negative or positive moment. The loading path for bending moment and axial force is chosen as to remain inside the normal force-bending moment failure curve. The failure in shear occurs at constant axial force and increasing bending moment. The whole procedure was first implemented to perform three rather simple preliminary tests. Their results show the technical feasibility of this protocol. Some limitation of initial parameters was evidenced. So better parameters were chosen for carrying out the main experimental program (presented in another paper).

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Abbreviations

L :

Length of the beam

l :

Span of the beam

a :

Distance from the application of the vertical force to the left support (shear span)

e :

Eccentricity of horizontal forces with respect to the mid-height of the beam

D :

Distance of the two pins for the transfer of axial tensile load

d :

Effective depth of the beam

s :

Spacing of stirrups

f c :

Concrete compressive strength

f y :

Yield stress of steel

f r :

Ultimate strength of steel

F :

Vertical force

F1, F2 :

Horizontal forces

R1, R2, Ra :

Reactions on the beam

N :

Axial tensile force

M :

Bending moment

V :

Shear force

A s :

Cross-section of a longitudinal steel reinforcing bar

N y :

Axial force corresponding to the yield stress of longitudinal steel reinforcing bars

N u :

Ultimate axial force

M u :

Ultimate bending moment

V u :

ultimate shear force

M + :

Positive bending moment induced by the shear force

M − :

Negative bending moment induced by the torque application system

θ :

Angle of the diagonal cracks with respect to the beam-axis

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Acknowledgements

Authors wish to thank EDF (Electricité de France, French national electricity supplier) for funding this study.

Funding

This study was funded by EDF (Electricité de France) (Grant No. 3682).

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Authors and Affiliations

  1. Université Paris-Est, Centre Scientifique et Technique du Bâtiment (CSTB), 84 avenue Jean Jaurès, Champs-sur-marne, 77447, Marne-la-Vallée Cedex 2, France

    Duc Toan Pham, Nicolas Pinoteau, Bernard Fouré, Ménad Chenaf, Philippe Rivillon & Romain Mège

  2. EDF – DIPNN – DT, 19 rue Bourdeix, 69363, Lyon Cedex 07, France

    Bernard Fouré & Salim Abouri

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  1. Duc Toan Pham
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  2. Nicolas Pinoteau
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  3. Bernard Fouré
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  4. Salim Abouri
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  5. Ménad Chenaf
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  6. Philippe Rivillon
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  7. Romain Mège
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Correspondence to Duc Toan Pham.

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Pham, D.T., Pinoteau, N., Fouré, B. et al. A new protocol for testing RC beams in combined shear and tension loading conditions. Mater Struct 53, 10 (2020). https://doi.org/10.1617/s11527-020-1441-y

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