Behavior of concrete prisms confined with FRP composites under axial cyclic compression

Abbasnia, Reza; Ziaadiny, H.

doi:10.1016/j.engstruct.2009.11.011

Cited by 72 publications

(47 citation statements)

References 25 publications

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“…According to the hypothesis proposed by Karsan and Jirsa (1969), a 25 unique envelope curve exists for a given cyclically loaded concrete specimen and it is identical to 26 the stress-strain curve of the same concrete under monotonic loading. This hypothesis was then 1 verified by subsequent studies on unconfined and steel-confined concrete, and was shown by Lam 2 et al (2006) and Abbasnia and Ziaadiny (2010) to be also valid for FRP-confined concrete. 3 4 To allow comparisons of the stress-strain curves of monotonically and cyclically tested specimens, 5 Fig.…”

Section: Discussion 22mentioning

confidence: 49%

Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression

2012

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Section: Discussion 22mentioning

confidence: 49%

Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression

2012

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“…Apparently, the relationship for residual plastic strain is not applicable for cycles at small strains where the cyclic behavior is rather elastic. The predictions of the proposed model are compared with the experimental results obtained by Lam et al [26], Abbasnia and Ziaadiny [37] and Bai et al [38] in Fig. 11.…”

Section: A New Model For Cyclic Loadingmentioning

confidence: 75%

“…As seen in this figure, there is a satisfactory agreement between the predicted and experimental unloading-reloading curves. RPS = 0.713 MAS − 0.0008 for unloading (9) MAS = 1.542 RPS + 0.0016 for reloading (10) As mentioned by Chen and Saleeb [39], to realistically simulate cyclic response of concrete, the model should be capable [26], Abbasnia and Ziaadiny [37] and Bai et al [38] of accounting for strength degradation, stiffness degradation and hysteretic behavior under loading cycles. Unlike plain concrete or steel confined concrete, FRP confined concrete does not exhibit strength degradation if FRP confinement is sufficiently effective.…”

Section: A New Model For Cyclic Loadingmentioning

confidence: 99%

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Cyclic Stress–Strain Relationships of FRP Confined Concrete Members

2014

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External confinement of columns of existing reinforced concrete buildings using fiber-reinforced polymer (FRP) composites can significantly increase the ductility and compressive strength of structural members against seismic actions. Therefore, knowledge on the behavior of FRP confined concrete/reinforced concrete members under cyclic stresses is vitally important for realistic prediction of seismic performance of retrofitted structures. In this study, available experimental data on the cyclic stress-strain behavior of FRP confined concrete/reinforced concrete members are evaluated in a comparative manner, and accuracy of several stress-strain models proposed for FRP confined concrete is discussed in terms of prediction of the skeleton curves, as well as the unloading-reloading branches of the cyclic stressstrain relationships of the tested samples. Furthermore, a new model is proposed for the prediction of unloading and reloading branches based on the cyclic tests carried out specifically for this purpose. The predictions of the proposed model and two other available models proposed for cyclic loading are compared with experimental data, and a satisfactory agreement is observed between the predictions and experimental data.

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“…Confinement studies of high-resistance concretes have also been published (20)(21)(22)(23). It has been found that confinement effect is greater when concrete strength is lower (24)(25)(26)(27) and that cyclic testing reduces rigidity (28)(29)(30)(31)(32)(33). However, confinement in low-resistance concretes has not been sufficiently studied.…”

Section: Introductionmentioning

confidence: 99%

Compressive strength behaviour of low- and medium-strength concrete specimens confined with carbon fibres in defective implementation conditions: an experimental study

et al. 2016

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This behaviour of low-and medium-strength concrete specimens confined with carbon fibrereinforced polymer (CFRP) was analysed in three loading cycles. In some cases, stress levels were achieved that produced intemal microcracks, which allowed residual rigidity and the behaviour of completely microcraked concrete specimens to be studied. The specimens were subsequently tested to compression to the fracture point. Specimens reinforced in accordance with no manufacturing defects (100% CFRP reinforcement) and major manufacturing defects (50% CFRP reinforcement) were assessed for effectiveness and behaviour of the confined elements in less than ideal conditions. Results show that confinement was higher in lowresistance concretes, that the behaviour of reinforced specimens was unaffected by defective implementation conditions and that the reinforced specimens were less rigid than the non-reinforced specimens when tested up to 40% of ultimate fracture strength. RESUMEN: Estudio experimental del comportamiento a compresión de probetas de hormigón de resistencias bajas y medias confinadas con tejidos de fibras de carbono y con defectos muy importantes de ejecución.En este trabajo se estudia el comportamiento de hormigones de resistencias bajas y medias confinados con CFRP. Se han realizado 3 ciclos de carga llegando en algunos casos a niveles de tensión que han microfisurado internamente el hormigón, lo que ha permitido estudiar la rigidez residual y el comportamiento de probetas confinadas con el hormigón totalmente microfisurado. Posteriormente todas las probetas se han ensayado a compresión hasta rotura. Los refuerzos se han realizado con buenas condiciones de ejecución y simulando grandes defectos para poder evaluar la eficacia de los elementos confinados cuando las condiciones de ejecución no son las correctas. Los resultados muestran que el efecto de confinamiento es superior en hormigones poco resistentes, el comportamiento de las probetas reforzadas es poco sensible a grandes defectos de ejecución y su rigidez es inferior al de las probetas originales cuando se ensayan hasta el 40% de la tensión de rotura.

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Behavior of concrete prisms confined with FRP composites under axial cyclic compression

Cited by 72 publications

References 25 publications

Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression

Behavior of FRP-Confined Normal- and High-Strength Concrete under Cyclic Axial Compression

Cyclic Stress–Strain Relationships of FRP Confined Concrete Members

Compressive strength behaviour of low- and medium-strength concrete specimens confined with carbon fibres in defective implementation conditions: an experimental study

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