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Shear Strengthening of Reinforced Concrete T-Beams by Using Fiber-Reinforced Polymer Composites: A Data Analysis

  • Research Article-Civil Engineering
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Abstract

Many studies have compiled experimental results of fiber-reinforced polymer (FRP) shear strengthened reinforced concrete (RC) beams into databases for the investigation of the effect of different parameters on the efficacy of FRP strengthening schemes. However, these studies are mainly comprised of the results of FRP shear strengthened rectangular RC beams. The RC T-beams are stronger in shear than the rectangular RC beams, represent the most realistic situation, and have more significance in the construction industry. However, no study comprising of a large number of results of FRP-strengthened RC T-beams has been found. Therefore, the present study represents the results of more than 250 tests performed on the shear deficient RC T-beams strengthened with FRP and also the essential material characteristics. It also compares the accuracy of seven widely used design guidelines for the prediction of shear contribution of FRP based on the experimental shear contribution of FRP. This study concludes that the efficacy of the FRP strengthening scheme varies with the adopted strengthening schemes, whereas the predictions of different design guidelines observed to be not promising. However, predictions by fib and TR55 guidelines have good correlation and standard deviation values, respectively, with the experimental results than the other guidelines.

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Abbreviations

a :

Shear span (mm)

A f :

Area of FRP shear reinforcement and Af= 2ntfwf

b :

Width of beam cross section

d :

Effective depth of the beam

d 0 :

Distance from extreme compression fiber of concrete to centroid of outermost layer of tensile reinforcements as per AS 5100.8 guideline

d f :

Effective depth of FRP

E f :

Elastic modulus of FRP (MPa) (in GPa for fib)

fbd/ffd/ffe/ffu :

Design bond strength/design strength/effective design strength/ultimate strength of FRP

f c :

Cylindrical compressive strength of concrete

f ctm :

Mean tensile strength of concrete

f fu :

Tensile strength of FRP

h w :

Web depth of completely impregnated with U-wrap

k 1 :

Concrete strength modification factor

k 2 :

Wrapping scheme modification factor

k b :

Geometrical corrective factor in CNR-DT 200R1

k EN :

The covering coefficient

k G :

Additional corrective factor; assumed equal to 0.037 mm for wet lay-up systems

K B :

Empirically calibrated coefficient; assumed equal to 1.128

kR/ϕR/ƞR :

Reduction coefficient based on radius at the corners

k v :

Bond-reduction coefficient

L e :

Effective bond length

m FRP :

Number of FRP strips intersected by the critical shear crack with bonded length less than the Le

n :

Number of FRP layers

n FRP :

Number of FRP strips intersected by the critical shear crack

r c :

Radius at the corners

s f :

Center-to-center spacing strips

S u :

Ultimate FRP-support slip; in CNR-DT 200 R1 and DAfStb assumed equal to 0.25 mm and 0.201 mm, respectively

t f :

Thickness of FRP/layer

w f :

Width of FRP

z :

Internal lever arm

α :

Angle in between principal fibers of FRP and the line perpendicular to the longitudinal axis of the member

β :

Angle in between the longitudinal axis of the beam and principal fibers of FRP

εf,e/εfu :

Effective/ultimate strain FRP

ε x :

Longitudinal strain at beam depth

α time :

Reduction factor based on long-term loading; assumed as equal to 1.0

Γfd :

Fracture energy

τ f :

Max. shear stress at FRP-concrete surface

θ :

Inclination of critical shear crack

ƞ :

Factor based on FRP wrapping scheme

ρ f :

The FRP reinforcement ratio and ρf=(2ntfwf/bsf)

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Acknowledgements

The authors would like to thank the National Institute of Technology, Rourkela, for financial support.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology, Rourkela, 769008, Odisha, India

    Swapnasarit Kar & K. C. Biswal

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  1. Swapnasarit Kar
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  2. K. C. Biswal
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Correspondence to Swapnasarit Kar.

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Table 3 Experimental database
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Kar, S., Biswal, K.C. Shear Strengthening of Reinforced Concrete T-Beams by Using Fiber-Reinforced Polymer Composites: A Data Analysis. Arab J Sci Eng 45, 4203–4234 (2020). https://doi.org/10.1007/s13369-020-04412-x

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