Strain rate effect on effective bond length of basalt FRP sheet bonded to concrete

Shen, Dejian; Shi, Huafeng; Ji, Yong; Yin, Fanglong

doi:10.1016/j.conbuildmat.2015.02.016

Cited by 64 publications

(22 citation statements)

References 32 publications

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“…BFRP sheet shows good performance on bond behavior. [18][19][20] Until recently, the bond stress-slip relationship between BFRP bars and concrete has not been studied in depth. 21 Hence, more work is required before general conclusions could be drawn about the bond performance of BFRP bars and concrete.…”

Section: Introductionmentioning

confidence: 99%

Bond stress–slip relationship between basalt fiber-reinforced polymer bars and concrete using a pull-out test

Shen

Ojha

Xiang

et al. 2016

Journal of Reinforced Plastics and Composites

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The basalt fiber-reinforced polymer bar is one of the newly evolved materials expected to be used as a structural reinforcement because of its non-corrosive nature and abundant tensile strength properties. The bond stress-slip relationship between fiber-reinforced polymer bars and concrete is necessary to evaluate the load carrying capacity of concrete components or structures reinforced with fiber-reinforced polymer bars. Although the relationship between fiber-reinforced polymer bars and concrete has been studied, the bond stress-slip relationship between concrete and basalt fiber-reinforced polymer bars considering the effect of bar diameter and concrete strength is still lacking. This paper presents an experimental investigation on the bond behavior between basalt fiber-reinforced polymer bars with different diameters (10, 14, and 20 mm) and concrete with two different compressive strengths using a pull-out test. The test results showed that (1) the failure mode between basalt fiber-reinforced polymer bars and concrete was equally contributed from crushing of concrete and failure of basalt fiber-reinforced polymer surface and mainly from delaminated resin-rich surface for the specimens with the concrete compressive strength of 43.6 and 71.8 MPa, respectively; (2) the bond strength between basalt fiber-reinforced polymer bars and concrete decreased with the increase of bar diameter;(3) the slip corresponding to bond strength increased with the increase of diameter of basalt fiber-reinforced polymer bars; (4) the bond strength between the basalt fiber-reinforced polymer bars with diameter of 10 mm and concrete increased by 18.8% when the concrete strength increased by 64.7%; and (5) the formulas for bond stress-slip relationship between basalt fiber-reinforced polymer bars and concrete in consideration of the ratio of concrete cover depth and concrete compressive strength were proposed. The calculation results of the formulas indicated good accuracy with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Bond stress–slip relationship between basalt fiber-reinforced polymer bars and concrete using a pull-out test

Shen

Ojha

Xiang

et al. 2016

Journal of Reinforced Plastics and Composites

Self Cite

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show abstract

“…The failure mode was similar with that of BFRP/CFRPconcrete in single or double shear tests [8,23]. The failure process included three phases: an inclined crack of approximate 45 ∘ appeared from the bottom near the midspan in concrete; with the increase of loading, interface crack between BFRP and concrete initiated at the root of the diagonal crack; the interfacial crack then propagated under complete debonding of the BFRP.…”

Section: Failure Modesmentioning

confidence: 70%

“…This has led to numerous studies on the mechanical properties of FRP-concrete bond interface. However, the majority of these studies are focused on the interface under monotonic loading, with a limited number under dynamic loading [8]; very limited information is available for the fatigue performance of the FRP-concrete bond interface which is of dominate importance in cases such as highway and railroad bridges [9]. A number of studies have been conducted on the fatigue behaviour of FRP-concrete interface using both the single shear pull-off test [9][10][11][12][13][14][15] and double shear pull-off tests [11,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fatigue Behaviour of BFRP‐Concrete Bond Interfaces under Bending Load

Xie

et al. 2018

Shock and Vibration

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Basalt fiber reinforced polymer (BFRP) composites are increasingly being used to retrofit concrete structures by external bonding. For such strengthened members, the BFRP-concrete interface plays the crucial role of transferring stresses. This study aims to investigate the fatigue behaviour of the interface under bending load. A series of tests were conducted on BFRP-concrete bonded joint, including static, fatigue, and postfatigue loading. The fatigue failure modes, the development of deflection, the evolution of BFRP strains, and the propagation of interfacial cracks were analysed. In addition, the debonding-induced fatigue life of BFRPconcrete bonded joints was studied. Finally, a new model of fatigue life was proposed by defining the effective fatigue bond stress. The results showed that the fatigue experience has a significant effect on the BFRP strength especially near the root of concrete transverse crack and on the bond performance of the adhesive near the interface crack tip. There are two main fatigue failure modes: BFRP rupture and BFRP debonding. The fatigue damage development of the bond interface has three stages: rapid, stable, and unstable growth. The proposed model for the debonding-induced fatigue life is more conservative for the BFRP-concrete bonded joints under pure shear load than for those under bending load.

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“…Apart from regression analysis, reliability of the derived model was also assessed based on the Integral Absolute Error (IAE, %). This index has been used by other researchers [54,55] to evaluate the performance of the fitted model. In Eq.…”

Section: Bond Length Seriesmentioning

confidence: 99%

Bond strength model for externally bonded FRP-to-timber interface

Vahedian

Shrestha

Crews

2018

Composite Structures

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Despite the large number of studies on externally bonded elements using FRP composites, there is a significant knowledge gap to gain a comprehensive understanding of potential parameters such as bond width, bond length, material properties and geometries that influence bond strength. Behaviour of FRP bonded to concrete has been well investigated and there are a number of experimental and theoretical studies in this area; however, limited attempts have been made to investigate the bond behaviour of the FRP to timber interface. This paper reports an investigation on the behaviour of FRP externally bonded to timber. A novel theoretical model has been developed through stepwise regression analysis of 136 single shear FRP-to-timber joints. This has led to establishing a new predictive model for determination of the bond strength for FRP-totimber joints. Results of this stepwise regression analysis are then assessed with results of experimental tests, and satisfactory comparisons have been achieved between ultimate applied loads and the predicted loads. Finally, a significant improvement in prediction of

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Strain rate effect on effective bond length of basalt FRP sheet bonded to concrete

Cited by 64 publications

References 32 publications

Bond stress–slip relationship between basalt fiber-reinforced polymer bars and concrete using a pull-out test

Bond stress–slip relationship between basalt fiber-reinforced polymer bars and concrete using a pull-out test

Experimental Study on Fatigue Behaviour of BFRP‐Concrete Bond Interfaces under Bending Load

Bond strength model for externally bonded FRP-to-timber interface

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