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Numerical analysis of GFRP-reinforced flat slab–column edge connection subjected to gravity and lateral loads

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Abstract

In this paper, a numerical study was performed to investigate the behavior of glass fiber reinforced polymer (GFRP) concrete slab–column edge connections under monotonically applied gravity and lateral loads. The effects of the size of the spandrel beam, column rectangularity, column shape, and extension distance of the slab beyond the column have been examined. The nonlinear finite element analysis was performed by ABAQUS and the accuracy of the numerical model was verified by experimental tests conducted by other researchers. Providing spandrel beams at the free edge and extending the slab section beyond the outer face of the column significantly enhanced the cracking and ultimate loads, and post-cracking stiffness of the connections. Providing a spandrel beam without an offset from the column centerline significantly increased (by about 64%) the ultimate shear capacity of the connection. However, constructing this beam with a 50 mm offset reduced the ultimate shear capacity increments to 51%. Increasing the rectangularity index of the column under the same punching shear perimeter length exhibited a slight reduction in ultimate load capacity. Extending the slab beyond the free edge slightly increased the strength of the connections, similar to the spandrel beam. Increasing the rectangularity of the column reduced the capacities of the connection.

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Any other relevant data related to this research work can be offered by the corresponding author upon request.

Abbreviations

FRP:

Fiber-reinforced polymer

GFRP:

Glass fiber reinforced polymer

ACI:

American concrete institute

FE:

Finite element

CDP:

Concrete damaged plasticity model

\(\rho\) :

Reinforcement ratio

\({f}_{\mathrm{c}}^{{\prime}}\) :

Peak uniaxial compressive strength of concrete

\({f}_{\mathrm{t}}^{{\prime}}\) :

Peak uniaxial tensile strength of concrete

\({f}_{\mathrm{fVb}}\) :

Bent ultimate tensile strength according to the B-5 test for GFRP bars

\({f}_{\mathrm{y}}\) :

Yield stress of steel reinforcements

\({\varepsilon }_{\mathrm{y}}\) :

Steel yield strain

\(\beta\) :

Column rectangularity index

\(k\) :

The ratio of minimum column dimension to slab effective depth

\({\sigma }_{\mathrm{c}}\) :

Concrete compressive strength

\({\sigma }_{\mathrm{ct}}\) :

Concrete tensile strength

\({\varepsilon }_{\mathrm{c}}\) :

Concrete compressive strain

\({\varepsilon }_{\mathrm{o}}\) :

Strain corresponding to the peak stress

\({E}_{\mathrm{co}}\) :

Initial modulus of elasticity of concrete

\({E}_{\mathrm{ct}}\) :

Modified secant modulus of elasticity of concrete

W :

Crack width

\({G}_{\mathrm{f}}\) :

Fracture energy

\({G}_{\mathrm{fo}}\) :

The base value of fracture energy

\({\alpha }_{\mathrm{f}}\) :

Coefficient to estimate the maximum crack width at zero tensile stress

\(\Delta\) :

Deflection

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Acknowledgements

The authors would like to thank the mining engineering department, Addis Ababa Science and Technology University for giving access to the high-performance computer laboratory.

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The authors would like to acknowledge Addis Ababa Science and Technology University for partially funding this research.

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  1. Department of Civil Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia

    Girum Alem Demissie & Temesgen Wondimu Aure

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  1. Girum Alem Demissie
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Correspondence to Temesgen Wondimu Aure.

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Demissie, G.A., Aure, T.W. Numerical analysis of GFRP-reinforced flat slab–column edge connection subjected to gravity and lateral loads. Asian J Civ Eng 23, 765–783 (2022). https://doi.org/10.1007/s42107-022-00456-6

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