Investigation on modeling parameters of concrete beams reinforced with basalt FRP bars

doi:10.1007/s11709-019-0580-0

Front. Struct. Civ. Eng.

2019, Vol. 13

Issue (6) : 1520-1530 https://doi.org/10.1007/s11709-019-0580-0

RESEARCH ARTICLE

Investigation on modeling parameters of concrete beams reinforced with basalt FRP bars

Jordan CARTER, Aikaterini S. GENIKOMSOU(

)

Civil Engineering Department, Queen’s University, Kingston, ON K7N 3N6, Canada

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Abstract

Fiber-reinforced polymer (FRP) bars are widely used as internal reinforcement replacing the conventional steel bars to prevent from corrosion. Among the different types of FRP bars, basalt FRP (BFRP) bars have been used in different structural applications and, herein, three already tested concrete beams reinforced with BFRP bars are analyzed using three-dimensional (3-D) finite element analysis (FEA). The beams were tested in four-point bending. In the FEA the behavior of concrete is simulated using the “Concrete-Damaged Plasticity” model offered in ABAQUS software. The research presented here presents a calibrated model for nonlinear FEA of BFRP concrete beams to predict their response considering both the accuracy and the computational efficiency. The calibration process showed that the concrete model should be regularized using a mesh-dependent characteristic length and material-dependent post-yield fracture and crushing energies to provide accurate mesh-size independent results. FEA results were compared to the test results with regard to failure load and crack patterns. Both the test results and the numerical results were compared to the design predictions of ACI 440.1R-15 and CSA S806-12, where CSA S806-12 seems to overestimate the shear strength for two beams.

Keywords basalt Fiber-reinforced polymer bars reinforced concrete beams finite element analysis damaged plasticity model design codes

Corresponding Author(s): Aikaterini S. GENIKOMSOU

Just Accepted Date: 04 September 2019 Online First Date: 30 October 2019 Issue Date: 21 November 2019

Cite this article:

Jordan CARTER,Aikaterini S. GENIKOMSOU. Investigation on modeling parameters of concrete beams reinforced with basalt FRP bars[J]. Front. Struct. Civ. Eng., 2019, 13(6): 1520-1530.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-019-0580-0
https://academic.hep.com.cn/fsce/EN/Y2019/V13/I6/1520

Fig.1 Schematic drawing of test apparatus.

Fig.2 Schematic drawing of the beams (cross-sections).

Tab.1 Material properties of the beams

Tab.2 Test results

Fig.3 Load versus mid-span deflection curves of the tested beams.

Fig.4 Crack patterns of the tested beams.

parameter	value
dilation angle $ψ$	36°
$ε$	0.1
$σ b o σ c o$	1.16
$K c$	0.667
$μ$	0

Tab.3 Plasticity properties of concrete for the beams

Tab.4 BFRP material properties

Fig.5 Compressive behavior of concrete: (a) stress-strain curve; (b) stress-inelastic strain (input data in ABAQUS).

Fig.6 Tensile stress-crack width curves for the beam NT.

Fig.7 Load-deflection response curves for the beam NT: Fracture energy investigation.

Fig.8 PEEQT tensile equivalent plastic strains representing cracking for the beam NT at failure.

Fig.9 Regularized tensile stress-strain curves for the beam NT for G_f = 0.138 N/mm: mesh size investigation.

Fig.10 Load-deflection response curves for the beam NT for G_f = 0.138 N/mm: mesh size investigation.

Fig.11 Compressive stress-plastic deformation for the beam NT considering crushing energy (G_fc = 80 N/mm).

Fig.12 Regularized compressive stress-strain curves for the beam NT for G_fc= 80 N/mm: mesh size investigation.

Fig.13 Load-deflection response curves for the beam NT: mesh size investigation after material regularization.

Fig.14 PEEQT tensile equivalent plastic strains representing cracking for the beam NT at failure: G_f = 0.138 N/mm, G_fc = 80 N/mm, mesh size= 25 mm.

Fig.15 Load-deflection curves of the beams.

Fig.16 PEEQT tensile equivalent plastic strains representing cracking at failure for beams: (a) FC and (b) FT.

Tab.5 Comparison between test, numerical, and design codes failure loads

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