Bond behavior and failure mechanism of fiber-reinforced polymer bar–engineered cementitious composite interface

Zhao, Debo; Zhou, Yingwu; Xing, Feng; Sui, Lili; Ye, Zenghui; Fu, Huankai

doi:10.1016/j.engstruct.2021.112520

Cited by 35 publications

(5 citation statements)

References 42 publications

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“…When the specimen was well-confined, the pullout failure mode usually occurred. When the specimen was in unconfined condition, the failure mode was splitting failure instead of pullout failure [ 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Liu

Dou

et al. 2022

Materials

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In order to evaluate the influence of freeze–thaw action on the durability of concrete structures, this paper presentedan experimental study to investigate the effects of freezing–thawing cycles and concrete strength on the bond behavior between steel bars and concrete confined with stirrups. Through freeze–thaw cycles and center pullouttests, the failure mode of pullout specimen, concrete strength, mass loss, dynamic elastic modulus, and bond–slip curves were analyzed. At last, the bond–slip constitutive model was proposed for specimens with stirrup confinement under freeze–thaw action. Main test results indicate that the failure mode and shape of bond–slip curves are affected by stirrups. The bond strength hasa certain increase after 100 freeze–thaw cycles owing to the constraining force from stirrups, whereasthe splitting tensile strengthsignificantly declines. After 100 freeze–thaw cycles, the splitting tensile strength of C20 and C40 decreased by40.8% and 46.5%, respectively. The formula was provided to calculate the bond strength of constrained concrete after freeze–thaw cycles, and the damage coefficient and other related parametersin the formula were suggested. The predicted bond–slip curves are close to the experimental results, which could provide reference for the related research of bond performance after freeze–thaw action.

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Section: Resultsmentioning

confidence: 99%

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Liu

Dou

et al. 2022

Materials

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“…Zhao et al (Zhao et al, 2021) investigated bond behaviorus of FRP bars in ECC experimentally and numerically. A simplified bond failure model was established based on the pullout failure mode.…”

Section: Literature Reviewmentioning

confidence: 99%

Steel Reinforced Self-Compacting Concrete (SCC) Cantilever Beams: Bond Behaviour in Poor Condition Zones

Montaser

Shaaban

Rizzuto

et al. 2023

Int J Concr Struct Mater

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Previous investigations carried out on reinforced self-compacted concrete (SCC) beams have reported contradictory results on reinforcement bond behaviour occurring in the zones defined for good bond conditions according to Eurocode2. Cantilevered SCC beams’ critical upper tension reinforcement bond behaviour has previously had limited reporting. In this study, the bond behaviour in normally vibrated concrete (NVC) and self-compacted concrete (SCC) in poor conditions zones are compared and the differences are highlighted. The effect of four parameters, including (i) concrete type (SCC and NVC), (ii) characteristic strength of SCC, (iii) lap splice length, and (iv) depth of concrete cover for the reinforcement is investigated. It was found that for the studied beams, increasing splice length improved the energy absorption and changed the failure mode to a more ductile manner even at the poor bond conditions zones. The maximum measured steel strains in SCC beams in the lap splice zones, were higher than those for NVC specimens. The mean bond stress values, for SCC beams with 25–50% lap splice lengths, were higher than those of NVC beams, with the same lap splice lengths, by 16–13%, respectively. The results of the current study showed that the empirical equations from the literature overestimated the bond strength of the splice lap length for cantilever upper steel in SCC beams with long splices which agrees with the state of the art as these equations were developed originally for short anchorage lengths.

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“…FRP bars and FRP-RC elements are prone to a unique set of defects as compared to their steel counterparts. For instance, the bond behavior of the FRP bar–concrete interface differs from that of the steel bar–concrete interface [ 20 ]. The bond failure of FRP bars not only occurs in the concrete but also inside the bars, unlike a steel bar [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in FRP-Reinforced Concrete Elements

Malla,

Khedmatgozar Dolati,

Ortiz

et al. 2024

Materials

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Fiber-Reinforced Polymer (FRP) composites have emerged as a promising alternative to conventional steel reinforcements in concrete structures owing to their benefits of corrosion resistance, higher strength-to-weight ratio, reduced maintenance cost, extended service life, and superior durability. However, there has been limited research on non-destructive testing (NDT) methods applicable for identifying damage in FRP-reinforced concrete (FRP-RC) elements. This knowledge gap has often limited its application in the construction industry. Engineers and owners often lack confidence in utilizing this relatively new construction material due to the challenge of assessing its condition. Thus, the main objective of this study is to determine the applicability of two of the most common NDT methods: the Ground-Penetrating Radar (GPR) and Phased Array Ultrasonic (PAU) methods for the detection of damage in FRP-RC elements. Three slab specimens with variations in FRP type (glass-, carbon- and basalt-FRP, i.e., GFRP, CFRP, and BFRP, respectively), bar diameter, bar depths, and defect types were investigated to determine the limitations and detection capabilities of these two NDT methods. The results show that GPR could detect damage in GFRP bars and CFRP strands, but PAU was limited to damage detection in CFRP strands. The findings of this study show the applicability of conventional NDT methods to FRP-RC and at the same time identify the areas with a need for further research.

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Bond behavior and failure mechanism of fiber-reinforced polymer bar–engineered cementitious composite interface

Cited by 35 publications

References 42 publications

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Steel Reinforced Self-Compacting Concrete (SCC) Cantilever Beams: Bond Behaviour in Poor Condition Zones

Damage Detection in FRP-Reinforced Concrete Elements

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