Investigation of HFRC columns reinforced with GFRP bars and spirals under concentric and eccentric loadings

Raza, Ali; Khan, Qaiser uz Zaman; Ahmad, Afaq

doi:10.1016/j.engstruct.2020.111461

Cited by 43 publications

(37 citation statements)

References 59 publications

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“…The longitudinal GFRP reinforcement ratios in the first, second, and third groups were 1.57%, 2.11%, and 2.65%, respectively. These low reinforcement ratios could be preferred in low seismicity zones [ 22 , 23 ]. The slenderness ratios of all specimens were kept at 4.6, defining them as short columns.…”

Section: Materials and Methodsologymentioning

confidence: 99%

“…The testing procedure was according to ref. [ 20 , 22 , 23 ]. For the application of uniform load on the surface of compressive members, plaster of Paris was utilized for smoothing and flattening the surface.…”

Section: Materials and Methodsologymentioning

confidence: 99%

“…Glass fiber-reinforced polymer (GFRP) bars have superior features over steel bars such as lower weight, higher corrosion resistance, lower electromagnetic interference, lower thermal conductivity, and higher tensile strength [8][9][10][11][12][13]. The use of FRP bars in aggressive environments lessens repair costs, increases serviceability, and prolongs the serviceable life of structures [9,[14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

et al. 2021

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Structural members comprising geopolymer recycled aggregate concrete (RAC) reinforced with glass fiber-reinforced polymer (GFRP) bars have not been investigated appropriately for axial compressive loading cases. The present study addresses this knowledge gap by evaluating the structural efficiency of GFRP-reinforced geopolymer recycled aggregate concrete (GGRAC)-based members subjected to axial compressive loading. A total of nine compressive members (250 mm in cross-section and 1150 mm in height) were constructed to examine the effect of the number of longitudinal GFRP bars and the vertical spacing of transverse GFRP hoops/ties. The experimental results portrayed that the ductility of GGRAC compressive members improved with the reduction in the pitch of GFRP hoops. The axial load-carrying capacity (LCC) of GGRAC compressive members increased by increasing the number of GFRP bars up to eight (corresponding to a reinforcement ratio of 2.11%) while it decreased by using ten longitudinal GFRP bars (corresponding to a reinforcement ratio of 2.65%). Additionally, an empirical model was suggested to predict the axial LCC of GGRAC compressive members based on a large amount of experimental data of similar members. The experimental results and related theoretical predictions substantially prove the applicability and accuracy of the proposed model. The proposed column represents a feasible structural member in terms of material availability and environmental sustainability.

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Section: Materials and Methodsologymentioning

confidence: 99%

Section: Materials and Methodsologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

et al. 2021

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“…During the last few decades, for providing the flexural and shear reinforcements, the employment of FRP rebars in reinforced concrete members is increasing [13,14]. Some investigations have been carried out to examine the performance of FRP rebars as longitudinal and transverse reinforcements in compressive and flexural members which depicted a better response of FRP rebars in these members [15][16][17][18][19][20][21]. As the axial compressive performance of FRP rebars is lower than that of steel rebars, therefore, some investigations have been carried out to determine the strength reduction coefficients for FRP rebars to secure the most optimum results under compressive loads [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…As concerned with the finite element analysis (FEA) of FRP-reinforced compressive members, a large of studies could be found in the literature that investigates the structural performance of such members using FEA under various conditions [5,19,20,30,[36][37][38][39][40][41]. From these studies, it was detected that the projected FEA models captured the structural behavior of FRP-reinforced concrete compressive members precisely.…”

Section: Introductionmentioning

confidence: 99%

Strength Profile Pattern of FRP-Reinforced Concrete Structures: A Performance Analysis through Finite Element Analysis and Empirical Modeling Technique

Raza

Shah²,

Alhazmi

et al. 2021

Polymers

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Limited research work is available in the literature for the theoretical estimates of axial compressive strength of columns reinforced with fiber reinforced polymer (FRP) rebars. In the present work, an experimental database of 278 FRP-reinforced concrete (RC) compression members was established from the literature to recommend an empirical model that can accurately predict the axial strength (AS) of GFRP-RC specimens. An initial assessment of 13 different previously anticipated empirical models was executed to achieve a general form of the AS model. Finally, a new empirical equation for forecasting the AS of GFRP-RC short columns was proposed using the curve fitting and regression analysis technique. The performance of the proposed empirical model over the previous experimental database represented its higher accuracy as related to that of other models. For the further justification of the anticipated model, a numerical model of GFRP-RC columns was simulated using ABAQUS and a wide parametric study of 600 GFRP-RC samples was executed to generate a numerical database and investigate the influence of various parameters using numerical and empirical models. The comparison between theoretical and numerical predictions with R2 = 0.77 indicted that the anticipated empirical model is accurate enough to apprehend the AS of FRP-RC specimens.

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Experimental investigation on the use of glass fiber reinforced polymer reinforcement in hollow‐core circular concrete columns

Ahmad

Sheikh

Hadi

2021

Structural Concrete

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This paper presents the results of an experimental investigation on the behavior of glass fiber reinforced polymer (GFRP) bar-reinforced hollow-core (GFRP-HC) circular concrete specimens under concentric, 25 mm and 50 mm eccentric axial loading and four-point bending. The main parameters investigated include the type of reinforcing bars, pitch of the helices and loading conditions. The test matrix of this study consists of 12 specimens, among which nine specimens (850 mm high) were tested under concentric and eccentric axial loading and the remaining three specimens (1500 mm long) were tested under four-point bending. The specimens were circular in cross-section with an outer diameter of 214 mm and an inner circular hole diameter of 56 mm. The experimental results showed that, for the similar amount of reinforcement, steel bar-reinforced hollow-core (steel-HC) specimens sustained higher loads than the GFRP-HC specimens under different loading conditions. Also, the steel-HC specimens achieved higher ductility than the GFRP-HC specimens under 50 mm eccentric axial loading and four-point bending. However, under concentric and 25 mm eccentric axial loading, the GFRP-HC specimens achieved higher ductility than the steel-HC specimens. The close pitch of the GFRP helices significantly enhanced the load carrying capacity and ductility of the GFRP-HC specimens. K E Y W O R D Sconcentric axial load, eccentric axial load, glass fiber reinforced polymer bar, glass fiber reinforced polymer helix, hollow-core columns, reinforced concrete

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Investigation of HFRC columns reinforced with GFRP bars and spirals under concentric and eccentric loadings

Cited by 43 publications

References 59 publications

On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

Strength Profile Pattern of FRP-Reinforced Concrete Structures: A Performance Analysis through Finite Element Analysis and Empirical Modeling Technique

Experimental investigation on the use of glass fiber reinforced polymer reinforcement in hollow‐core circular concrete columns

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