Performance Improvement of a Fiber-Reinforced Polymer Bar for a Reinforced Sea Sand and Seawater Concrete Beam in the Serviceability Limit State

Jiang, Jihong; Luo, Jie; Yu, Jiangtao; Wang, Zhichen

doi:10.3390/s19030654

Cited by 30 publications

(17 citation statements)

References 39 publications

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“…FRP reinforced concrete beams are characterized by large deflection, wide crack width and no obvious yield stage [ 6 , 7 , 8 , 9 ]. Gdoutos et al [ 10 ] pointed out that the lower elastic modulus and unique bonding characteristics of FRP bars are the main reasons for the larger deformation of FRP bars reinforced concrete members than that of reinforced concrete members with the same concrete strength, load, component size and reinforcement ratio.…”

Section: Introductionmentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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FRP (Fiber Reinforced Polymer) Bar reinforced coral concrete beam is a new type of structural member that has been used more and more widely in marine engineering in recent years. In order to study and predict the flexural performance of CFRP reinforced coral concrete beams, the flexural rigidity, crack morphology and failure mode of concrete were studied in detail. The results show that under the condition of similar reinforcement ratio, the flexural rigidity of CFRP reinforced coral concrete beam is significantly lower than that of ordinary reinforced concrete beam. Increasing the cross-section reinforcement ratio within a certain range can increase the bending stiffness of the test beam or reduce the deflection, but the strength utilization rate of CFRP reinforcement is greatly reduced. The short-term bending stiffness of the CFRP reinforced coral concrete beam calculated by the existing standard formula is obviously higher. This paper proposes a modified formula for introducing the strain inhomogeneity coefficient (ψ) of CFRP bars and considers the relative slip between CFRP bars and coral concrete to predict the short-term flexural stiffness of coral concrete beams reinforced by CFRP bars. The formula was verified with the test results, and it was proved that the formula has a good consistency with the test results.

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Section: Introductionmentioning

confidence: 99%

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

et al. 2021

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“…The latter require specific data related to cracking phenomena. Hence, digital image correlation (DIC) systems constitute an interesting alternative to monitor strains and displacements based on a non-contact optical technique [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study on Retrofitted Masonry Elements under Shear Using Digital Image Correlation

Torres

Varona

Baeza

et al. 2020

Sensors

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Architectural heritage is usually built with masonry structures, which present problems under lateral in-plane loading conditions, such as wind pressure or earthquakes. In order to improve the shear behavior of masonry, the use of a fabric-reinforced cementitious matrix (FRCM) has become an interesting solution because of its synergy of mechanical properties and compatibility with masonry substrates. For a proper structural evaluation, the mechanical behavior of reinforced masonry and the FRCM itself needs to be characterized. Hence, a numerical model to evaluate the FRCM reinforcement requires some mechanical parameters that may be difficult to obtain. In this sense, the shear behavior of masonry can be evaluated by means of diagonal tension tests on small specimens (71 × 71 cm). In this work, a digital image correlation (DIC) monitoring system was used to control displacements and cracking patterns of masonry specimens under shear stress (induced by diagonal tension with FRCM layers) applied to one or two sides. In addition, the mechanical behavior of FRCM coupons under uniaxial tensile tests was also registered with DIC. The displacement measurements obtained by DIC were validated with the measurements registered with LVDT. Unlike LVDT-based techniques, DIC monitoring allowed us to measure deformations in masonry during the full test, detecting crack initiation even before it was visible to the eye.

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“…5 Corrosion-resistant fiber-reinforced polymer (FRP) material has emerged as an effective alternative to steel reinforcement. 6,7 Traditional glass FRP (GFRP) rebars have been commonly used in concrete structures, owing to their low cost and similar thermal expansion coefficient compared with concrete. However, the OH − ions in a humid concrete environment react with the SiO 2 in the glass fibers and may cause considerable deterioration of GFRP.…”

Section: Introductionmentioning

confidence: 99%

Bond behavior between basalt fiber‐reinforced polymer rebars and coral‐reef‐sand concrete conditioned in saline solution

Ding

Shi

Wang

et al. 2019

Structural Concrete

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This paper studies the bond behavior between basalt fiber-reinforced polymer (BFRP) rebars and coral-reef-sand (CRS) concrete exposed to a saline environment. The gradation and mix proportion of CRS concrete was firstly selected, through compressive tests on CRS concrete cubes. A series of pullout tests were conducted on a total of 84 pullout specimens after conditioning in a saline solution. The experimental variables included type of rebar (steel and BFRP), diameter of BFRP rebar, conditioning duration and temperature, and type of conditioning (continuous immersion and wet-dry cycle). The stress-slip curves and bond strength of the pullout specimens were analyzed and discussed. The results show that 0.54 is selected as the water/cement ratio for CRS concrete, among the range of analyzed concrete mixes. The bond behaviors of BFRP rebars depend on their diameter. BFRP rebars with 12-mm-diameter have the best bond durability after conditioning in a saline solution, when compared with their counterparts with 8-and 16-mmdiameters. The effects of conditioning temperature and type of conditioning on the bond behavior of 12-mm-diameter BFRP rebar are negligible. A design-oriented formula was proposed for the prediction of the development length of a BFRP rebar in CRS concrete based on the experimental data. Furthermore, modified BPE models were calibrated to describe the bond-slip relationship of BFRP rebars in CRS concrete in a saline environment.

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Performance Improvement of a Fiber-Reinforced Polymer Bar for a Reinforced Sea Sand and Seawater Concrete Beam in the Serviceability Limit State

Cited by 30 publications

References 39 publications

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

Study on Retrofitted Masonry Elements under Shear Using Digital Image Correlation

Bond behavior between basalt fiber‐reinforced polymer rebars and coral‐reef‐sand concrete conditioned in saline solution

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