Evaluation of Existing Stress–Strain Models and Modeling of PET FRP–Confined Concrete

Pimanmas, Amorn; Saleem, Shahzad

doi:10.1061/(asce)mt.1943-5533.0002941

Cited by 45 publications

(2 citation statements)

References 135 publications

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“…However, the prediction effect of ultimate strain is far less than that of ultimate stress. Similar trends have also been reported in previous studies on FRP-confined NSC Bai et al (2019); Pimanmas and Saleem, (2019); Yuan et al (2022b). First, the stress measurement technique is more reliable than the strain measurement technique, and the strain measurement may be affected by the premature failure of the sample.…”

Section: Forecasting Model Modificationsupporting

confidence: 87%

A review study on axial compression properties of UHPC columns confined by FRP

Song,

Zhang,

You

et al. 2024

Front. Mater.

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The failure of ultra-high performance concrete (UHPC) under axial compression has significant brittleness, so it is necessary to use fiber reinforced polymer (FRP) to constrain UHPC for achieving ductile failure. This article mainly summarized the research progress of FRP constrained UHPC columns, analyzed the influence of different variables on the compressive performance of FRP-confined UHPC columns and the coupling effect between variables, compared the axial compressive stress-strain models of FRP-confined UHPC columns proposed by previous scholars, and evaluated the existing models using a large amount of collected experimental data. The evaluation results indicated that the existing models provided relatively accurate predictions for ultimate stress, but further improvement and correction are needed for predicting ultimate strain. Based on the data collected in this study, the models had been modified, resulting in improved accuracy in predicting both ultimate stress and ultimate strain.

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Section: Forecasting Model Modificationsupporting

confidence: 87%

A review study on axial compression properties of UHPC columns confined by FRP

Song,

Zhang,

You

et al. 2024

Front. Mater.

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“…An AR value greater than 1 means overestimation whereas underestimation is related to an AR value smaller than 1. AAR and AR are calculated using Equations ( 4) and ( 5), respectively [75].…”

Section: Peak Axial Strain Modelsmentioning

confidence: 99%

Sustainable and Low-Cost Hemp FRP Composite Confinement of B-Waste Concrete

et al. 2022

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Each year, massive amount of construction waste is generated that needs proper attention in terms of its disposal without deteriorating surrounding environment. A significant portion of this waste comprises bricks. Besides, large number of new construction works are resulting in the depletion of natural resources rapidly. Intuitively, a sustainable solution demands to consume this construction waste in the best way possible. This study targeted brick waste as a potential material to be used as a partial replacement of natural aggregates in structural concrete. It has been known that the concrete constructed with recycled brick aggregates possesses substandard mechanical properties. Traditionally, synthetic FRPs are known to strengthen recycled aggregate concrete. However, recognizing high costs associated with them, this study proposed the use of natural hemp fiber ropes to strengthen recycled aggregate concrete constructed with brick aggregates. To assess the efficacy of hemp ropes in strengthening mechanical properties of the concrete with coarse aggregates partially replaced with recycled brick aggregates (B-waste), an experimental framework was conducted. Sixteen cylindrical specimens were tested in two groups depending upon the concrete strength. Within each group, 2 specimens each were strengthened with 1, 2, and 3 layers of hemp fiber ropes. Axial monotonic compressive loading was applied to each specimen. Results revealed that hemp fiber ropes significantly improved ultimate compressive strength and the corresponding strain. A substantial improvement in axial ductility was observed. For the sake of performance-based non-linear modelling, accurate constitutive modelling at material level is necessary. For this purpose, several existing analytical stress-strain models were tested in this study to predict ultimate confined compressive strength and strain. It was found that several models predicted confined compressive strengths with reasonable accuracy. However, very few models were able to predict confined peak strain with good accuracy.

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Dynamic compressive behaviors of polyethylene terephthalate fiber reinforced recycled aggregate concrete

Yan,

Bai,

Chen

2024

Structural Concrete

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Polyethylene terephthalate (PET) fibers are green, environmentally friendly materials. They mainly come from recycled plastic bottles and other products. The addition of PET fibers to recycled aggregate concrete (RAC) has the potential to reduce concrete damage and increase specimen toughness. In this study, the influences of recycled coarse aggregate (RCA) replacement ratio and fiber volume ratio on the impact response of PET fiber reinforced RAC at various strain rates were experimentally investigated. It was found that the compressive strength, critical strain, and toughness grew with the increasing strain rate, followed by the aggravation of the concrete damage. Owing to the strain rate effect, the failure mode of concrete specimen at a high strain rate was different from that under a quasi‐static loading. This led to the reduction of differences in the dynamic compressive strength between the natural and recycled aggregate concrete at a high strain rate. Although the replacement of natural coarse aggregates with RCAs resulted in the decrease in the dynamic compressive strength, it increased the critical strain of the specimen. To reduce the brittleness of concrete materials, flexible fibers, PET fibers were added into the concrete matrix. It was found that the addition of PET fibers increased the critical strain and significantly reduced concrete damage. The empirical equations were proposed to describe the rate‐dependent dynamic compressive strength, critical strain, and toughness based on experimental data.

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Evaluation of Existing Stress–Strain Models and Modeling of PET FRP–Confined Concrete

Cited by 45 publications

References 135 publications

A review study on axial compression properties of UHPC columns confined by FRP

A review study on axial compression properties of UHPC columns confined by FRP

Sustainable and Low-Cost Hemp FRP Composite Confinement of B-Waste Concrete

Dynamic compressive behaviors of polyethylene terephthalate fiber reinforced recycled aggregate concrete

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