“…The use of glass fiber-reinforced polymer (GFRP) rebars as a replacement for the internal steel reinforcement is an excellent solution to have durable reinforced concrete (RC) structures in aggressive environments [ 1 , 2 ]. Therefore, many studies have concentrated on understanding and simulating the axial behavior of concrete members with internal FRP bars (i.e., [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]).…”
In reinforced concrete structures, the fiber-reinforced polymer (FRP) as reinforcing rebars have been widely used. The use of GFRP (glass fiber-reinforced polymer) bars to solve the steel reinforcement corrosion problem in various concrete structures is now well documented in many research studies. Hollow concrete-core columns (HCCs) are used to make a lightweight structure and reduce its cost. However, the use of FRP bars in HCCs has not yet gained an adequate level of confidence due to the lack of laboratory tests and standard design guidelines. Therefore, the present paper numerically and empirically explores the axial compressive behavior of GFRP-reinforced hollow concrete-core columns (HCCs). A total of 60 HCCs were simulated in the current version of Finite Element Analysis (FEA) ABAQUS. The reference finite element model (FEM) was built for a wide range of test variables of HCCs based on 17 specimens experimentally tested by the same group of researchers. All columns of 250 mm outer diameter, 0, 40, 45, 65, 90, 120 mm circular inner-hole diameter, and a height of 1000 mm were built and simulated. The effects of other parameters cover unconfined concrete strength from 21.2 to 44 MPa, the internal confinement (center to center spiral spacing = 50, 100, and 150 mm), and the amount of longitudinal GFRP bars (ρv = 1.78–4.02%). The complex column response was defined by the concrete damaged plastic model (CDPM) and the behavior of the GFRP reinforcement was modeled as a linear-elastic behavior up to failure. The proposed FEM showed an excellent agreement with the tested load-strain responses. Based on the database obtained from the ABAQUS and the laboratory test, different empirical formulas and artificial neural network (ANN) models were further proposed for predicting the softening and hardening behavior of GFRP-RC HCCs.
“…The use of glass fiber-reinforced polymer (GFRP) rebars as a replacement for the internal steel reinforcement is an excellent solution to have durable reinforced concrete (RC) structures in aggressive environments [ 1 , 2 ]. Therefore, many studies have concentrated on understanding and simulating the axial behavior of concrete members with internal FRP bars (i.e., [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]).…”
In reinforced concrete structures, the fiber-reinforced polymer (FRP) as reinforcing rebars have been widely used. The use of GFRP (glass fiber-reinforced polymer) bars to solve the steel reinforcement corrosion problem in various concrete structures is now well documented in many research studies. Hollow concrete-core columns (HCCs) are used to make a lightweight structure and reduce its cost. However, the use of FRP bars in HCCs has not yet gained an adequate level of confidence due to the lack of laboratory tests and standard design guidelines. Therefore, the present paper numerically and empirically explores the axial compressive behavior of GFRP-reinforced hollow concrete-core columns (HCCs). A total of 60 HCCs were simulated in the current version of Finite Element Analysis (FEA) ABAQUS. The reference finite element model (FEM) was built for a wide range of test variables of HCCs based on 17 specimens experimentally tested by the same group of researchers. All columns of 250 mm outer diameter, 0, 40, 45, 65, 90, 120 mm circular inner-hole diameter, and a height of 1000 mm were built and simulated. The effects of other parameters cover unconfined concrete strength from 21.2 to 44 MPa, the internal confinement (center to center spiral spacing = 50, 100, and 150 mm), and the amount of longitudinal GFRP bars (ρv = 1.78–4.02%). The complex column response was defined by the concrete damaged plastic model (CDPM) and the behavior of the GFRP reinforcement was modeled as a linear-elastic behavior up to failure. The proposed FEM showed an excellent agreement with the tested load-strain responses. Based on the database obtained from the ABAQUS and the laboratory test, different empirical formulas and artificial neural network (ANN) models were further proposed for predicting the softening and hardening behavior of GFRP-RC HCCs.
“…Using the stress-strain relations proposed by Hasan et al. [21] , the analytical results have shown an acceptable correlation with the experimental ones. Fig.…”
Section: Experimental Design Materials and Methodsmentioning
confidence: 65%
“…The model was verified against an experimental dataset provided by Hasan et al. [21] , which summarizes the results of experimental investigations conducted on normal and high strength columns by Hadi et al. [26 , 27] , respectively.…”
Section: Experimental Design Materials and Methodsmentioning
confidence: 97%
“…Several researches have adopted the use of strength curves for determining adequate design recommendations [10 , [18] , [19] , [20] . Several analytical modeling approaches were proposed to consider the slenderness effects using second order analysis [6 , 9 , 12 , [20] , [21] , [22] , [23] , [24] , [25] . Using these approaches, an integrated model was developed to perform the required analytical simulations.…”
Section: Experimental Design Materials and Methodsmentioning
“…Priestley et al (1971) derived the bending moment relationship for prestressed concrete members using a purely analytical approach, including the effect of concrete tension between cracks. Hasan et al (2019) developed a numerical integration method to study moment-curvature behavior of circular normal strength concrete (NSC) and high strength concrete (HSC) columns reinforced with (GFRP) rods.…”
At present, there are only a few studies on the application of coal gangue concrete to structural components. To study the moment-curvature relationship of steel fibre-reinforced coal gangue concrete beams, a simplified calculation method was proposed in this study. The equations were optimised based on current design codes, including theoretical calculations of flexural stiffness, crack width and spacing, cracking moment and ultimate moment. Calculated results were compared with experimental results to verify that the cracking moment and ultimate moment of the beams were slightly lower than those of natural concrete beams. However, the cracking moment, flexural stiffness and ductility of coal gangue concrete beams was increased by incorporating steel fibres. Increasing the rebar ratio also significantly improved the load-carrying capacity but reduced ductility. The calculated values for moment-curvature were close to the experimental values, proving the optimised calculations have a high accuracy and are applicable to predicting the bending behaviour of steel-fibre-reinforced coal gangue concrete beams. This paper provides a theoretical basis for subsequent related research.
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