Experiments and Finite Element Analysis of GFRP Reinforced Geopolymer Concrete Rectangular Columns Subjected to Concentric and Eccentric Axial Loading

Elchalakani, Mohamed; Karrech, Ali; Dong, Minhao; Ali, M.S. Mohamed; Yang, Bo

doi:10.1016/j.istruc.2018.04.001

Cited by 112 publications

(44 citation statements)

References 27 publications

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“…Modelling of Reinforcing Bars. An isotropic linear elastic behavior was assumed to model the GFRP bars in ABAQUS, up to failure without applying any damage criterion [35,36]. e linear elastic behavior of GFRP reinforcing bars was assumed because of the reason that they show brittle failure after yielding without going to the plastic range as shown in Figure 6.…”

Section: Tensile Behavior Of Concretementioning

confidence: 99%

“…Only four parameters were needed for modelling of reinforcing bars which are Poisson's ratio (]) and modulus of elasticity for elastic behavior and yield strength and corresponding plastic strain for plastic behavior of steel bars. In this study, Poisson's ratio (]) was assumed as 0.3 for steel bars and 0.25 for GFRP bars [35]. e physical properties of GFRP and steel bars used in this research are given in Tables 3 and 4, respectively.…”

Section: Tensile Behavior Of Concretementioning

confidence: 99%

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Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Raza

Khan

Ahmad

2019

Advances in Civil Engineering

117

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The present work demonstrates the nonlinear finite element analysis (NLFEA) of 13 concentrically and eccentrically loaded short rectangular concrete column specimens reinforced with GFRP and conventional steel bars. GFRP bars are lightweight having the high tensile strength and high corrosion resistance. An NLFEA model for the rectangular concrete specimens was developed using the commercial software ABAQUS Standard and calibrated for different materials and geometric parameters based on the previous experimental test results of the studied specimen. The behavior of reinforced concrete was modelled using the concrete damaged plasticity (CDP) model, the behavior of steel bars was simulated as a bilinear elastoplastic material, and the GFRP bars were considered as a linear elastic material. After the calibration of CDP parameters, the control sample was used for the further numerical parametric analysis to investigate the effect of critical parameters, i.e., the area of concrete (Ac), the compressive strength of concrete (fc′), and the ratio of longitudinal reinforcement (ρl) and transverse reinforcement (ρt) on the load-carrying capacity of columns. The results show that the selected NLFEA model can simulate the behavior of columns accurately and there was good agreement of numerical results obtained from ABAQUS Standard with the experimental results.

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Section: Tensile Behavior Of Concretementioning

confidence: 99%

Section: Tensile Behavior Of Concretementioning

confidence: 99%

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Raza

Khan

Ahmad

2019

Advances in Civil Engineering

117

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“…3 findings were reported. The behaviour of GPC beams were investigated in several experimental studies [16][17][18][19][20][21][22] while other studies examined the structural performance of GPC columns [23][24][25][26]. In general, these studies showed the structural response of the GPC beams and columns was almost identical to that of OPC and thus concluded that the current design codes and models for OPC structures can be applied to calculate the strength of GPC beams and columns.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

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Although there has been a numerous quantity of studies investigating the mechanical properties of geopolymer concrete (GPC), parameters for designing GPC structures are still not systematically investigated and carefully justified. ACI rectangular stress-block parameters is able to predict well the strength of conventional concrete structures but their applicability for GPC is questionable. This study aims to establish new sets of rectangular stress-block parameters for GPC with a broad range of the compressive strength up to 66 MPa. The proposed rectangular stress-block parameters in this study are based on two analytical concrete stress-strain models and measured curves from previous studies of GPC materials. The results from this study show that the use of ACI recommendations for concrete structure in designing GPC beams is still acceptable with high accuracy. However, the axial load-carrying capacity of GPC columns computed by ACI parameters deviate significantly from the experimental results while the proposed parameters provide a good correlation with these experimental data. The significant difference is mainly due to the modification of k 3 , which is the ratio of concrete strength in real structures to standard cylinder samples. This study suggests that the assumption of k 3 =0.9 in previous studies for conventional Portland concrete is not suitable for use in deriving the stress-block parameters of GPC. In some cases, this ratio should be reduced to 0.7 depending on the curing condition.

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“…Amiri et al showed that these elements are proper for non-linear static and dynamic analysis and they follow the constitutive law of integration [11]. Also, the concrete material properties is defined in the software, using concrete damaged plasticity model, with dilation angle () of 40 o , shape factor for yield surface (K) of 0.72 and ratio of initial equi-biaxial compressive yield stress to initial uniaxial compressive yield stress (fb0/fc') of 1.15 [12][13][14][15][16].…”

Section: Verificationmentioning

confidence: 99%

Increasing the Contribution of GFRP Bars on the Compressive Strength of Concrete Columns with Circular Cross Section

et al. 2019

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Corrosion of steel in concrete elements is a major issue in concrete structures. In order to overcome this matter, Glass Fiber Reinforced Polymer (GFRP) reinforcement is being used in concrete members from almost 20 years ago. Although it has been used and developed in recent years, there are still some uncertainties for the application of FRP reinforcement, especially in concrete columns. Most codes such as ACI, CSA, JSCE & etc. neglects the effect of these reinforcements or they do not permit them in compressive concrete elements. In this essay, it has been shown that these rebar can contribute significantly in compressive strength of concrete columns if the column confinement is provided sufficiently. In order to achieve the required confinement to reach a sharp contribution of GFRP longitudinal rebar in concrete columns, the spiral of FRP rebar with small pitches around longitudinal rebar is taken into account. This leads to higher strains of concrete which can result in a higher contribution of FRP longitudinal rebar. Foremost, equations related to the compressive strength of concrete columns considering the influence of spiral confinement will be carried out. Then, a parametric study will be performed, and the effects of pitch, concrete strength, column diameter, the quantity of longitudinal rebar and concrete cover will be investigated.

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Experiments and Finite Element Analysis of GFRP Reinforced Geopolymer Concrete Rectangular Columns Subjected to Concentric and Eccentric Axial Loading

Cited by 112 publications

References 27 publications

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Increasing the Contribution of GFRP Bars on the Compressive Strength of Concrete Columns with Circular Cross Section

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