Experimental and numerical study on concrete beams reinforced with Basalt FRP bars under static and impact loads

Huang, Zhijie; Chen, Wensu; Tran, Tung T.; Pham, Thong M.; Chen, Zuyu; Elchalakani, Mohamed

doi:10.1016/j.compstruct.2021.113648

Cited by 65 publications

(27 citation statements)

References 50 publications

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“…Subsequently, quasi-static bending tests were conducted to determine the residual behavior. The residual behavior has also been reported by a group of studies [19][20][21]. The residual strength of geopolymer concrete beams was increased with the inclusion of fiber [21].…”

Section: Introductionsupporting

confidence: 68%

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

et al. 2021

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Sequential small impact loads may not collapse structures directly but could weaken the strength of structures. This study aimed to investigate the impact of these sequential small impact loads on the strength of the reinforced concrete beams. First, six sequential impact loads were applied to the test specimens. Then, the residual static capacity of the impacted specimens was determined by the ultimate static load test, compared with those of undamaged specimens. The experiment was composed of 12 specimens having identical dimensions. The variable parameters were the magnitude of the axial load and shear reinforcement. Under the sequential small impacts, the axial load improves the impact performance. It reduces the tensile strain of the longitudinal reinforcement. Hence, the flexural tensile crack propagation is limited. In addition, the local damage at the impact location is minimized and the shear plug induced diagonal shear crack is prevented. The axial force is also able to diminish the adverse effect of the large spacing stirrups. Large impact load could alter the failure of a designed flexural critical reinforced concrete beam without axial load to the shear failure. Although the axial load improves the impact response, the Residual Resistance Index (RRI) decreases with axial load. For the damaged specimens with axial load, the ultimate static load is lower than the calculated concrete shear capacity and more severe diagonal shear cracks were found. It can be obviously said that the prior impact damage decreases the concrete shear capacity.

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Section: Introductionsupporting

confidence: 68%

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

et al. 2021

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“…Different studies compared various FRP reinforced beams in light of guidelines and standards; some tried to apply the test results to propose new models for calculation of FRP reinforced beams [ 39 , 40 , 41 ]. Each new study brings us closer to preparing a model with a high degree of compliance.…”

Section: Discussionmentioning

confidence: 99%

Load-Bearing Capacity of Beams Reinforced with Composite Rebar in Regard to Existing Guidelines

2021

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Non-metallic reinforcement such as fiber-reinforced polymer (FRP) is now being increasingly used in construction. Despite numerous similarities, elements reinforced with non-metallic bars work differently from the ones reinforced with steel bars, including cracking and failure mode. The examination of the stress state in these elements, so important for their proper design, raises many difficulties. The article presents the results of tests of bended beams reinforced with GFRP bars. The results of the experimental tests were compared with calculations based on selected design instructions. The results have shown that beams reinforced with GFRP exhibit increased cracking, higher deflection, and often mode of failure through crushing of concrete. The results have shown that in bended elements reinforced with the GFRP bars, the rebar often does not achieve the strength declared by the manufacturer. The study has shown that theoretical values of load-bearing capacity of beams reinforced with composite rebar differ greatly between different guidelines and instruction. The analysis showed that the use of GFRP bars as a replacement for steel bars is possible in demanding environmental conditions. However, excessive deflections and cracks may result in limited application due to overall serviceability requirements of the element.

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“…If the composite contains j fiber agglomerates, the fiber uniform Advances in Civil Engineering distribution coefficient of the composite is the average value of j fiber agglomerates. As shown in equation ( 10), the fiber clustering content w can be calculated according to equation (11).…”

Section: Analysis Of Fiber Clustering Effect Based On Fractal Eorymentioning

confidence: 99%

“…Substitute the data in Table 1 into equation (11), and the value of fiber clustering content of BFRP samples based on fractal theory can be obtained. Combining the above value with the results of [19] (calculated by approximate method), it can be found that the fiber clustering content increases with the increase of fiber volume fraction.…”

Section: Analysis Of Bfrp Fiber Clustering Effect Based On Fractalmentioning

confidence: 99%

“…It mainly refers to research on the mechanical properties of BFRP material as reinforcement, plate, and net. For example, Zha et al [11] applied BFRP as reinforcement to concrete beam members and studied the impact bending performance of BFRP reinforced concrete beams. Experiment results indicated that the impact resistance of BFRP reinforced concrete beams was equivalent to that of ordinary reinforced concrete beams, and BFRP reinforced concrete beams could be applied to beam members instead of steel bars.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fractal‐Based Fiber Clustering on Tensile Properties of BFRP

Shi

Zhang

et al. 2021

Advances in Civil Engineering

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To explore the clustering phenomenon of discontinuous fibers in composite materials, this paper deduces the fiber uniform distribution coefficient and analytical expressions of fiber clustering content based on fractal theory and establishes a tensile strength prediction model of fiber/epoxy resin composite materials containing cluster fibers. With basalt fiber/epoxy resin composites (BFRP) as an example, this paper analyzes the tensile strength law of BFRP under fiber clustering effect. The results show that when the fiber volume fraction is constant, the tensile strength of the composite in the presence of agglomerated fibers is only related to the fractal dimension of the circumference and cross-sectional area of the inner fiber agglomerate. The calculated value of the composite tensile strength based on fractal theory is lower than the experimental value, but closer to the experimental value than the approximate method. The research conclusions can provide theoretical support for strength prediction of fiber/epoxy resin composites.

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Experimental and numerical study on concrete beams reinforced with Basalt FRP bars under static and impact loads

Cited by 65 publications

References 50 publications

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

Load-Bearing Capacity of Beams Reinforced with Composite Rebar in Regard to Existing Guidelines

Effect of Fractal‐Based Fiber Clustering on Tensile Properties of BFRP

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