Bond-slip model for FRP-to-concrete bonded joints under external compression

Biscaia, Hugo C.; Chastre, Carlos

doi:10.1016/j.compositesb.2015.06.004

Cited by 72 publications

(22 citation statements)

References 22 publications

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“…is is because the higher the concrete strength is, the higher the interfacial cohesion between the FRP tube and concrete [30]. Although with the increase of the concrete stress, dry shrinkage increases, leading to a tendency for the concrete to debond from the [17].…”

Section: Influence Of the Concrete Strength On Bond Behaviormentioning

confidence: 99%

Analysis of Bond Behavior of FRP‐Confined Concrete Piles Based on Push‐Out Test

Wang

Gong

Dai

et al. 2020

Advances in Materials Science and Engineering

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Due to the significant differences in the properties (e.g., anisotropy, elasticity modulus, and surface roughness) of fibre-reinforced polymer (FRP) and traditional pile materials, research on bond behavior between FRP tube and concrete should be conducted to ensure that they can work together properly. Push-out tests on twenty-nine GFRP-confined concrete piles were performed, the influence of bond type, slenderness ratio of FRP tube, radius-thickness ratio of FRP tube, concrete stress and concrete type on bond behavior and distribution of axial strains were studied, and simplified bond-slip constitutive models based on test results were proposed. It was found that bond type was a critical factor influencing bond behavior. A smaller radius-thickness ratio, a higher concrete stress, and the use of expansive concrete were advantageous for achieving higher bond behavior, whereas the slenderness ratio had little influence on the bond behavior. The axial strain distribution of all FRP tubes demonstrated the following rules: the upper strain was greater than the middle strain, which was larger than the lower strain, but for normal concrete specimens, the strain was linearly distributed with height, while for expanded concrete specimens, the distribution curves were polylines.

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Section: Influence Of the Concrete Strength On Bond Behaviormentioning

confidence: 99%

Analysis of Bond Behavior of FRP‐Confined Concrete Piles Based on Push‐Out Test

Wang

Gong

Dai

et al. 2020

Advances in Materials Science and Engineering

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“…e soil mass on the soil nail has a certain restraining effect on the deformation of the mortar body, and the overburden pressure generated by this effect is related to the rock and soil conditions [27]. eoretical upper and lower limits for the constraint conditions of mortar include the unconstrained condition (lower limit) and strong constraint condition (upper limit).…”

Section: Introductionmentioning

confidence: 99%

Effect of Mortar Constraint Conditions on Pullout Behavior of GFRP Soil Nails

Chen

Que

Zheng

et al. 2020

Advances in Materials Science and Engineering

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Glass fiber reinforced polymer (GFRP) bars are safe, light, and environmentally friendly and, hence, have emerged as desirable alternatives to traditional steel reinforcements in soil nailing wall reinforcement. The loads experienced by GFRP soil nails are transmitted through bonding with mortar and the surrounding soil mass. Constraints of the soil mass on mortar affect the pullout performance of the nails. This paper presents a laboratory test study on the influence of different mortar constraint conditions on the pullout behavior of GFRP soil nails. The results indicated that single loading or cyclic loading has a negligible effect on the failure modes of specimens under different constraints. Therefore, all specimens underwent the same mode of failure, i.e., splitting failure of the mortar. The ultimate pullout force associated with single loading under strong constraint conditions was 77% higher than that under unconstrained conditions, and the anchorage depth increased from 0.6 m to 1.0 m. The load-slip curves obtained for unconstrained conditions and strong constraint conditions were approximately straight lines and double broken lines, respectively. The ultimate tensile stress of GFRP soil nails exceeds the tensile strength of ordinary steel bars, indicating that these nails have sufficient strength reserve.

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“…Systematic investigations have been carried out on the bond–slip behavior between CFRP and concrete under quasi-static loading. Comprehensive research studies, which include the mechanical experiments [ 3 , 4 , 5 , 6 , 7 ], analytical analysis, and numerical analysis [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ], have been performed on static bond–slip performance. The test methods that are popularly adopted to investigate interface bond included beam tests and direct pull-out tests (which comprised double-shear pull-out tests and singer-shear pull-out tests).…”

Section: Introductionmentioning

confidence: 99%

“…The test methods that are popularly adopted to investigate interface bond included beam tests and direct pull-out tests (which comprised double-shear pull-out tests and singer-shear pull-out tests). Various static bond–slip models, which were applied to a CFRP–concrete interface under different working conditions, were proposed by researchers [ 6 , 7 , 14 , 15 , 16 ]. A rise phase followed by a fall phase was commonly incorporated in the proposed accurate or simplified models [ 6 , 7 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Bond–Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading

Cao

Yang

et al. 2018

Materials

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The objective of this paper was to explore the bond–slip relationship between carbon fiber-reinforced polymer (CFRP) sheets and concrete under cyclic loading through experimental and analytical approaches. Modified beam tests were performed in order to gain insight into the bond–slip relationship under static and cyclic loading. The test variables are the CFRP-to-concrete width ratio, and the bond length of the CFRP sheets. An analysis of the test results in this paper and existing test results indicated that the slope of the ascending segment of the bond–slip curve decreased with an increase in the number of load cycles, but the slip corresponding to the maximum shear stress was almost invariable as the number of load cycles increased. In addition, the rate of reduction in the slope of the ascending range of the bond–slip curve during cyclic loading decreased as the concrete strength increased, and increased as the load level or CFRP-to-concrete width ratio enhanced. However, these were not affected by variations in bond length if the residual bond length was longer than the effective bond length. A bilinear bond–slip model for CFRP sheets that are externally bonded to concrete under cyclic loading, which considered the effects of the cyclic load level, concrete strength, and CFRP-to-concrete ratio, was developed based on the existing static bond–slip model. The accuracy of this proposed model was verified by a comparison between this proposed model and test results.

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Bond-slip model for FRP-to-concrete bonded joints under external compression

Cited by 72 publications

References 22 publications

Analysis of Bond Behavior of FRP‐Confined Concrete Piles Based on Push‐Out Test

Analysis of Bond Behavior of FRP‐Confined Concrete Piles Based on Push‐Out Test

Effect of Mortar Constraint Conditions on Pullout Behavior of GFRP Soil Nails

Bond–Slip Relationship for CFRP Sheets Externally Bonded to Concrete under Cyclic Loading

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