Experimental Study of Concrete Columns with Localized Failure

Wei, Youyi; Wu, Yu-Fei

doi:10.1061/(asce)cc.1943-5614.0000686

Cited by 27 publications

(15 citation statements)

References 9 publications

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“…When the stress–strain curve is converted into post‐peak normalized stress‐displacement curve, all the curves coincides to one another, which suggests that—similar to unconfined concrete—compression failure of concrete confined by low level of steel tube confinement is also localized, that is, under the same level of confinement, the amount of displacement needed to fracture concrete is the same. This is consistent with those observed by Akiyama et al and Wei and Wu for concrete columns confined by steel lateral ties and FRP strips, respectively.…”

Section: Evaluation Of Compressive Fracture Zone (Localization Zone) supporting

confidence: 93%

“…Several methods have been proposed to quantify the length of this zone such as optical methods through stereophotogrammetry by, embedding strain gauges attached on acrylic bars in concrete, and use of acoustic emission techniques . More recently, the use of digital image correlation (DIC) has also been used in fiber reinforced polymer (FRP)‐confined (partially) concrete . These methods have significantly contributed to understanding the compression localization phenomenon in concrete.…”

Section: Introductionmentioning

confidence: 99%

“…9 More recently, the use of digital image correlation (DIC) has also been used in fiber reinforced polymer (FRP)confined (partially) concrete. 10 These methods have significantly contributed to understanding the compression localization phenomenon in concrete. However, the methods are not always practical and applicable, in particular, when concrete is fully encased by a confining material such as steel tubes.…”

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confidence: 99%

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Numerical evaluation of localization and softening behavior of concrete confined by steel tubes

Mendoza

Yamamoto

Nakamura

et al. 2018

Structural Concrete

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A newly developed coupled numerical model is presented to investigate the compressive localization and softening behavior of concrete under steel tube confinement. The coupled model combines the use of rigid body spring model (RBSM) and nonlinear shell finite element method (FEM) to simulate concrete and steel in steel tube–confined concrete members. Numerical evaluation of compression localization in steel tube–confined concrete columns showed that the compressive behavior of this type of column is also localized and that the length of compressive fracture zone was found to be more localized in square cross section than equivalent circular cross section. With increasing slenderness and level of confinement, it was found that localization length increases with increasing confinement, and for higher confinement level, localization zone can only be observed in longer specimens. This means that localization and softening of concrete can always occur irrespective of confinement level but depends on the size (height) of the member.

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Section: Evaluation Of Compressive Fracture Zone (Localization Zone) supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical evaluation of localization and softening behavior of concrete confined by steel tubes

Mendoza

Yamamoto

Nakamura

et al. 2018

Structural Concrete

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“…Their results suggested that localization and the development of a failure mechanism in concrete caused the development of stress concentration zones where the ultimate FRP strain was reached, thus resulting in premature failures, as was noted in experimental observations [28]. Using a photogrammetric digital image correlation technique (DICT) that allows capturing strains from the surface of the FRP-confined concrete, Bisby and co-workers [16,17,20], El-Hacha and co-workers [19,21,23] and Wei and Wu [29] measured the non-uniformity of the hoop strains across the height of the tested concrete cylinders and the sharp rise of these strains points to localized failure. Extensive arrays of electrical resistance strain gauges were also utilized by other researchers [18,22,24] to confirm the non-uniform distribution of the hoop strains in the FRP along the height of the cylindrical concrete samples, and the localization of failure.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders

Tabbara

Karam

2020

Applied Sciences

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In order to improve the efficiency of fiber reinforced plastics (FRP) confinement as a method to repair and strengthen concrete structures, a parametric analysis was carried out to investigate the effects of cylinder slenderness and the stiffness of the confinement on the localization pattern, the stress–strain response and the effectiveness of the confinement. FRP-wrapped concrete cylinders under axial compression were modeled in a high-resolution finite element model. Concrete was modeled as a Mohr–Coulomb material. The bi-linear stress–strain structural responses concur with published experimental data. Localization along discrete shear planes results in a failure mechanism that causes non-uniform hoop stresses in the FRP wrap due to the movement of solid wedges in the mechanism. A characteristic length for localization was identified and found in agreement with published experimental observations. The confinement efficiency shows a clear dependence on the confinement level and a weak dependence on slenderness above the characteristic length. A simple mechanistic model is proposed for the second branch of the bi-linear stress–strain response curve. The results of this study can be used to estimate the confinement efficiency factor and refine the design recommendations of Equation 12.1 of ACI 440.2R17.

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“…For non-uniformly FRP confined concrete specimens, the rupture of one layer CFRP can be used as a suitable indication before the final rupture of the specimens. Moreover, even though Specimens P60-E0 achieved the lowest peak axial loads, the axial deformation was the highest, which was mainly because significant strain localization occurred within the nonwrapped region (Wei and Wu 2016).…”

Section: Specimens Under Concentric Axial Loadmentioning

confidence: 93%

Eccentrically Loaded FRP Confined Concrete with Different Wrapping Schemes

et al. 2018

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This study presents the results of an experimental program on the comparative performance of fiberreinforced polymer (FRP) confined concrete specimens with different wrapping schemes. A total of 32 specimens in four groups were cast and tested under concentric and eccentric axial loads. All specimens were wrapped with the same amount of FRP but with different wrapping schemes, including full wrapping, partial wrapping, and nonuniform wrapping. Specimens in the first group were fully wrapped (Group F). Specimens in the second group were partially wrapped with 30 mm FRP strip spacing (Group P30). Specimens in the third group were partially wrapped with 60 mm FRP strip spacing (Group P60). Specimens in the fourth group were nonuniformly wrapped with a combination of full and partial wrapping (Group FP). Two similar specimens in each group were tested under concentric, 15 mm eccentric, 25 mm eccentric, and 40 mm eccentric axial loads. The test results indicate that fully wrapped specimens outperformed other groups of specimens under both concentric and eccentric axial loads, which were followed by nonuniformly and partially wrapped specimens. With the increase in axial load eccentricity, the performance in all groups significantly decreased. Moreover, with the increase in axial load eccentricity, the failure mode changed from FRP rupture at the compression side to extensive concrete cracking at the tension side. Equations were developed to predict the compressive strength of FRP confined concrete with different wrapping schemes. Experimental and analytical interaction (P-M) diagrams were also constructed to investigate the axial and flexural behavior of different groups of specimens.

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Experimental Study of Concrete Columns with Localized Failure

Cited by 27 publications

References 9 publications

Numerical evaluation of localization and softening behavior of concrete confined by steel tubes

Numerical evaluation of localization and softening behavior of concrete confined by steel tubes

Parametric Investigation of the Effects of Localization and Slenderness on the Stress–Strain Response and Confinement Efficiency in FRP-Wrapped Concrete Cylinders

Eccentrically Loaded FRP Confined Concrete with Different Wrapping Schemes

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