Experimental, numerical, and theoretical study of punching shear capacity of corroded reinforced concrete slab-column joints

Gomaa, Ahmed M.; Lotfy, Ehab M.; Khafaga, Sherif A.; Hosny, Sally; Ahmed, Manar A.

doi:10.1016/j.engstruct.2023.116280

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…In the performance evaluation of FRP bar structures, one of the key indicators is the bond performance between the FRP bar and concrete. The results of the current study show that the bond performance of FRP bars and concrete can be summarized as: (1) the maximum average bond stress decreases as the diameter increases; (2) the maximum average bond stress decreases as the bond length increases [11][12][13]. However, the method of surface treatment of the FRP bars also has an impact on the bond strength.…”

Section: Introductionmentioning

confidence: 69%

“…In the use of a reinforced concrete structure, concrete plays a certain role in protecting the steel bars, but due to the external temperature, it is not stable; moreover, corrosive media intrusion, the concrete cover being too small, and other reasons, result in the destruction of the surface protective film of the steel bars. As the corrosion of steel bars occurs, the mechanical properties decrease [1][2][3]. The main advantages of fiber-reinforced polymer (FRP) bars are their low density, light weight, ease of construction, and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Bond Performance between Glass-Fiber-Reinforced Polymer (GFRP) Bars and Concrete

Wang,

Liu,

Miao

2023

Buildings

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By investigating the bond performance between glass-fiber-reinforced polymer (GFRP) bars and concrete, GFRP bars can be better applied to concrete structures as a building material. This paper considered the effects of three different GFRP bar surface treatments, three bonding lengths, corrosive solution, and immersion time on the bonding strength. The test results indicated that the bond strength decreases with the increase in the diameter and bond length. The bonding between GFRP bars and concrete can be improved by treating the surface of the bars in different ways. Compared with the control group, the bond strength of the specimens in the saline solution decreased by 1.3–21.4%, and the bond strength of the specimens in the alkaline solution decreased by 26.5–38.8%. In the corrosive environment, the bond properties are degraded. A bond strength calculation formula considering the surface treatment method of the GFRP bars was proposed. The prediction formula of the bond strength retention rate between the GFRP bar and concrete in the corrosive environment was established. The formula was validated with the available research data and the calculated values agreed well with the test values. The MBPE model and CMR model are modified to establish the bond-slip model of the GFRP bars and concrete in the corrosive environment. The model curve is close to the test curve. This paper provides a theoretical basis for future research on the bond-slip performance of GFRP bars and concrete.

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