Effect of Predamage on the Stress-Strain Relationship of Confined Concrete under Monotonic Loading

Wu, Yufei; Yun, Yanchun; Wei, Youyi; Zhou, Yingwu

doi:10.1061/(asce)st.1943-541x.0001015

Cited by 87 publications

(118 citation statements)

References 23 publications

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“…It approaches a constant when ε un is greater than 0.02. A similar trend was reported by Wu et al [17].…”

Section: Reloading Elastic Modulus E Resupporting

confidence: 82%

“…The extensive study by Wu et al [17] of the stress-strain relationship of FRP repaired concrete has shown that confinement does affect its initial elastic modulus, particularly for concrete with higher damage (larger ε un ) and larger confinement. On the other hand, the residual plastic strain significantly affects E re , and based on Eq.…”

Section: Reloading Elastic Modulus E Rementioning

confidence: 98%

“…This assumption is widely accepted not only for unconfined concrete and conventional steel confined concrete but also for fibre reinforced polymer (FRP) confined concrete [1][2][3][4][5][6][7][8]. The stress-strain modeling of FRP-confined concrete under monotonic compression has been 2 extensively investigated in the past and a large number of models are available in extant literature [9][10][11][12][13][14][15][16][17][18][19]. However, to the best of knowledge of the authors, only four models have been reported for FRP-confined concrete under cyclic compression [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Stress–strain model of FRP confined concrete under cyclic loading

2015

Composite Structures

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“…It approaches a constant when ε un is greater than 0.02. A similar trend was reported by Wu et al [17].…”

Section: Reloading Elastic Modulus E Resupporting

confidence: 82%

Section: Reloading Elastic Modulus E Rementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Stress–strain model of FRP confined concrete under cyclic loading

2015

Composite Structures

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“…Unexpected large scatter was observed in the relationships of strain versus damaged degree indicating the effect of damaged degree in strain is comparatively negligible. This finding was similar with those reported by Wu et al in the investigation of repaired concrete using CFRP jacketing [2]. However, no detail explanation was given in their report.…”

Section: Pre-damaged Effects On Confined Hsc Columnssupporting

confidence: 82%

“…When a concrete structure was damaged due to major events such as earthquakes, blast or impact, its integrity has been compromised and it can collapse anytime if no immediate actions were taken to restore its capacity [1][2][3][4][5][6]. An engineer can choose to either replace the affected structure members with new members, demolish the structure for rebuild or emergency repair.…”

Section: Introductionmentioning

confidence: 99%

Effects of Predamaged Level on Confined HSC Columns

et al. 2017

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Abstract. In the design of repair works for damaged concrete, an accurate and representative stress-strain model is of important. The stress-strain model for damaged high strength concrete (HSC) repaired with posttensioning steel straps confinement yet available, although the confining method has been proven to be effective in improving the performance of non-damaged HSC. A series of experimental test was carried out to investigate the stress-strain relationships of such concrete. A total of 24 HSC cylinders were compressed until certain damaged levels, then repaired by using steel straps. Two important parameters have been identified to have significant effects on the stress-strain relationship of such repaired concrete, namely the confining volumetric ratio and damaged levels. These parameters were incorporated into the development of stressstrain model, which later was shown to correlate well with the experimental results. This paper also has evidenced that existing stressstrain models of damaged concrete are not suitable to be directly applied to the design of repair works using post-tensioning steel straps confinement that produce external lateral stress on damaged columns before subsequent loading applied.

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Energy balance method for modeling ultimate strain of fiber‐reinforced polymer‐repaired concrete

Tijani

Lim

2019

Structural Concrete

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The energy balance method has been widely used in the extant literature to derive the ultimate axial strain of conventional confined concrete columns. However, researchers noted that this method yields unrealistic results compared to experimental data when it is applied to fiber-reinforced polymer (FRP) confined concrete columns. Therefore, it is deemed that the existing ultimate strain model based on the energy method cannot be directly applied to FRP-repaired concrete. With this model shortcoming in mind and through a theoretical analysis with proper calibration, the current study extended the energy balance approach to develop a generalized model to determine the ultimate strain of FRP repaired concrete columns. This proposed new model can be used to predict the ultimate strain of repaired columns under both concentric and eccentric loadings. Because this model is established in a unified form without any restrictions to the cross-sectional geometry, it is applicable to different shapes of repaired columns. On the other hand, although the energy balance method is unconservative for heavily damaged concrete, it exhibits a better performance with respect to the existing models when compared with the test result. K E Y W O R D Sconcrete structure, confinement, energy method, FRP, repairing, ultimate strain

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Effect of Predamage on the Stress-Strain Relationship of Confined Concrete under Monotonic Loading

Cited by 87 publications

References 23 publications

Stress–strain model of FRP confined concrete under cyclic loading

Stress–strain model of FRP confined concrete under cyclic loading

Effects of Predamaged Level on Confined HSC Columns

Energy balance method for modeling ultimate strain of fiber‐reinforced polymer‐repaired concrete

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