Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Lo, S.H.; Kwan, A.K.H.; Ouyang, Yi; Ho, J.C.M.

doi:10.1016/j.engstruct.2015.06.010

Cited by 47 publications

(9 citation statements)

References 28 publications

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“…where ε cc is axial strain at peak stress corresponding to the confined concrete strength, and a 1 , a 2 , a 3 and a 4 are coefficients governing the shape of the stress-strain curve. The detailed mathematical formulations of Attard and Setunge's model can be found in that has been verified in the two previous studies by the authors [32][33] is again applied and tested herein. Then, from the lateral confining stresses, the triaxial failure surface is employed to evaluate the ultimate axial strength, i.e.…”

Section: Modelling Of Confined Concretementioning

confidence: 55%

“…As in previous research recently published by the authors [32,33], the FE model simulates the constitutive behaviour of concrete under confinement using the lateral stain-axial strain relation developed by Dong et al [34], the triaxial failure surface developed by Menétrey and Willam [35] and the axial stress-strain relation of confined concrete developed by Attard and Setunge [36]. For easy reference, a summary of the mathematical expressions in these models are given in Table 1.…”

Section: Modelling Of Confined Concretementioning

confidence: 99%

“…2 is normal to the plane of the element (x-y plane). It should be noted that based on the authors' previous research [32], with high mesh density adopted, numerical result on T3…”

Section: Fe Analysis Of Eccentrically Loaded Circular Cfst Columnsmentioning

confidence: 99%

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Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Ouyang

Kwan

et al. 2017

Engineering Structures

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The casting of concrete in concrete-filled steel tube (CFST) can, via the confinement effect of the steel tube, significantly increase the ductility of the concrete and, in the case of high-strength concrete (HSC), alleviate the shortfall in ductility of the HSC. This kind of structure is gaining popularity but its behaviour is quite complicated. In an axially loaded circular CFST column, the confinement is uniform and equi-biaxial (isotropic within the cross-section). But, when the circular CFST column is under eccentric load, the confinement becomes non-uniform and anisotropic. Such complicated confinement effect is not easy to analyse and for such analysis, a rigorous finite element (FE) method is generally needed. In this paper, a new FE model considering the lateral strain-axial strain relation of the confined concrete covering the full range from the initial elastic stage to the inelastic stage is developed for the analysis of circular CFST columns under eccentric load. The FE model is used to analyse a total of 95 CFST specimens tested by other researchers and the numerical results are compared to the published test results for verification.

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Section: Modelling Of Confined Concretementioning

confidence: 55%

Section: Modelling Of Confined Concretementioning

confidence: 99%

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Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Ouyang

Kwan

et al. 2017

Engineering Structures

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“…Thus, numerical methods with strong background knowledge of FEA are more efficient and convenient tools to be used for engineering research [26]. The structural performance of FRP-confined concrete was accurately predicted by FEA models [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Sustainable FRP-Confined Symmetric Concrete Structures: An Application Experimental and Numerical Validation Process for Reference Data

Raza¹,

Shah²,

Khan³

et al. 2020

Applied Sciences

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The use of fiber-reinforced polymer (FRP) jackets as external confinement is becoming popular, especially in seismic areas, because of its ability to enhance the strength and ductility of reinforced concrete to perform as a sustainable symmetric structural member. Therefore, various researchers have worked out for the prediction of strength and strain models of FRP-confined concrete. This study presents the improved strain models for the FRP confined cylindrical concrete members. Different previously proposed models of axial strain of FRP-confined concrete were evaluated based on a large database of 678 specimens from previous experiments and an improved model was proposed using the general regression analysis technique. Furthermore, the proposed model was validated using the previous experimental work of FRP-wrapped concrete cylinders and their finite elements analysis (FEA) using the ABAQUS software. The accuracy of the proposed strain model was quite satisfactory in comparison with the previous experimental and FEA results of the present study. Moreover, the proposed empirical strain model was used for the parametric study to investigate the effect of different geometric and material parameters such as the compressive strength of unconfined concrete, diameter of the cylinder, elastic modulus and thickness of the FRP layers, on the axial strain of FRP-wrapped cylinders. A close agreement among the proposed strain models and experimental outputs was observed. This study will help in understanding the behavior of sustainable FRP-confined symmetric concrete members.

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“…The rehabilitation of existing structures is one of the most important topic addressed by the scientific community in the last decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Innovative materials and techniques are widespread used for the strengthening of structures.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Pbo-FRCM Strengthening of Rc Columns in MRFS

Monaco¹,

Colajanni²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Innovative materials and techniques are widespread used for the strengthening and rehabilitation of existing structures. Recent researches have been developed on new fiber reinforced composites in which epoxy resin is replaced by inorganic cementitious material. These kind of cement-based composite material is known as Fiber Reinforced Cementitious Matrices (FRCM) recently used also in combination with synthetic polymeric fibers named PBO. The efficiency of this new confining system has been demonstrated by a large number of compression tests on concrete specimens while there are only few experimental researches on the behaviour of large scale specimens under external action able to simulate the actual behaviour of columns in MRFs. This paper firstly presents the results of experimental tests on squared and rectangular specimens of medium-size concrete columns reinforced by PBO-FRCM subject to axial load; successively, an experimental campaign is performed on RC columns subjected to axial force and bending moment. Confined and unconfined columns, manufactured with different cross sections and concrete types, are tested. The experimental tests on concrete columns and RC pillars are reproduced through finite element models in which the behaviour of the confined concrete is simulated using the Concrete Damaged Plasticity model with properly adapted plastic parameters, according to recent studies available in the literature. The stress-strain law used in the model is deduced from a classical approach available in the literature for FRP confined concrete which is properly modified in order to take into account the efficiency reduction of FRCM with respect to FRP wraps.

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Finite element analysis of axially loaded FRP-confined rectangular concrete columns

Cited by 47 publications

References 28 publications

Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Sustainable FRP-Confined Symmetric Concrete Structures: An Application Experimental and Numerical Validation Process for Reference Data

Efficacy of Pbo-FRCM Strengthening of Rc Columns in MRFS

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