Interfacial behavior and debonding failures of full-scale CFRP-strengthened H-section steel beams

Zeng, Jun-Jie; Gao, Wan-Yang; Liu, Feng

doi:10.1016/j.compstruct.2018.06.045

Cited by 60 publications

(21 citation statements)

References 41 publications

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“…The fibers in the FRP strip were oriented in the hoop direction and a 150 mm overlapping zone was adopted for all the wrapped specimens. Unlike the bond between the FRP and the concrete in a beam or beam–column member in which the bond strength is significant (e.g., [38,39,40]), the failure of FRP will not occur in the overlapping zone (i.e., debonding failure generally will not appear) and the FRP serves as a confining material in a column member. That is to say, the bond strength between the layers of FRP, rather than that between the concrete and FRP, is critical to the confinement effectiveness.…”

Section: Experimental Studymentioning

confidence: 99%

Confined Concrete in Fiber-Reinforced Polymer Partially Wrapped Square Columns: Axial Compressive Behavior and Strain Distributions by a Particle Image Velocimetry Sensing Technique

Guo

Xiao

Luo

et al. 2018

Sensors

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Strengthening existing reinforced concrete (RC) columns using a partial wrapping strengthening technique (PWST) by fiber-reinforced polymer (FRP) strips has been widely implemented. However, compared with the confinement mechanism of confined concrete in columns strengthened with the FRP full wrapping strengthening technique (FWST), the confinement mechanism of confined concrete in FRP partially wrapped columns is less understood. This paper presents the results of an experimental investigation into the behavior of confined concrete in FRP partially wrapped square columns under axial compression. The effects of FRP strip width and thickness on stress–strain behavior were thoroughly investigated. The novel particle image velocimetry (PIV) non-contact strain sensing technique was adopted to measure the strain in the specimens. Results show that the axial strains as well as the hoop strains are generally larger at the mid-plane of adjacent FRP strips than those at the mid-plane of each FRP strip, and considerable variation in hoop strains along the height of the specimens was observed. Comparisons between the experimental results and predictions by existing design-oriented stress–strain models were carried out to examine the accuracy of the models. A new design-oriented stress–strain model is proposed for confined concrete in FRP partially wrapped square columns and the comparisons between laboratory results and predictions from the proposed model show that the proposed model is superior to the existing models.

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Section: Experimental Studymentioning

confidence: 99%

Confined Concrete in Fiber-Reinforced Polymer Partially Wrapped Square Columns: Axial Compressive Behavior and Strain Distributions by a Particle Image Velocimetry Sensing Technique

Guo

Xiao

Luo

et al. 2018

Sensors

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“…In addition, the performance of the CFRP reinforced steel beam is also studied by several researchers. Zeng et al (2018) investigated the interface performance and the failure modes of the CFRP reinforced steel beam by experiment and simulation method. The proposed finite element mode has been experimentally demonstrated that can be applied in predicting the flexural behavior of CFRP reinforced steel beam.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance and life prediction of CFRP plate in the RC bridge roof reinforcement

Yuan

Zheng²,

Zhu

et al. 2020

Lat. Am. j. solids struct.

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This paper investigated the fatigue properties and theoretical research on Carbon-Fiber-Reinforced Polymer (CFRP) RC bridge roof with new deck-pavement material. Two deck pavement schemes of CFRP-reinforced specimens were designed and tested. Four-point flexural fatigue tests were carried out on the specimens. The fatigue crack propagation, the deflection development and the CFRP strain under bridge fatigue load were researched. The test results show that the CFRP plate-reinforced specimens crack resistance performance can be improved and can bear the fatigue test load of two million times. Combined with the characteristics of the crack growth rate and fatigue damage accumulation of CFRP plate-reinforced bridge roof specimens, the fatigue life prediction analytical model for CFRP plate reinforced RC bridge roof was obtained. The fatigue life prediction model agrees well with the experimental results. The model proposed in this paper could be applied to predict the fatigue life of the CFRP plate-reinforced RC bridge roofs.

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“…Earlier researches classified six different failure modes for bonded FRP-steel systems: failure at the steel-adhesive interface, failure at the FRP-adhesive interface, adhesive layer failure, FRP delamination, FRP rupture and steel yielding [4][5]. The behavior of steel beams externally reinforced by bonded FRP laminates was examined thoroughly during the last two decades [6][7][8][9][10]. In 2007 design guidelines for strengthening steel beams using bonded FRP composites were proposed considering the different failure modes of bonded FRP-steel system along with the instructions for surface preparation [11].…”

Section: Introductionmentioning

confidence: 99%

Performance of Steel I-Beams Strengthened by Fastening Hybrid FRP Strips

AbouEl-Hamd¹,

Sweedan²,

El-Ariss³

2020

Proceedings of the 4th International Conference on Civil, Structural and Transportation Engineering (ICCSTE'19)

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Interfacial behavior and debonding failures of full-scale CFRP-strengthened H-section steel beams

Cited by 60 publications

References 41 publications

Confined Concrete in Fiber-Reinforced Polymer Partially Wrapped Square Columns: Axial Compressive Behavior and Strain Distributions by a Particle Image Velocimetry Sensing Technique

Confined Concrete in Fiber-Reinforced Polymer Partially Wrapped Square Columns: Axial Compressive Behavior and Strain Distributions by a Particle Image Velocimetry Sensing Technique

Fatigue performance and life prediction of CFRP plate in the RC bridge roof reinforcement

Performance of Steel I-Beams Strengthened by Fastening Hybrid FRP Strips

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