Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites

Büyüköztürk, Oral; Güneş, Oğuz; Karaca, Erdem

doi:10.1016/s0950-0618(03)00094-1

Cited by 336 publications

(142 citation statements)

References 51 publications

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“…The performance of the bond between FRP and concrete is a key factor determining the behaviour of the strengthened structure [5][6][7][8][9]. Several failure modes in reinforced concrete (RC) members strengthened with FRP composites are directly caused by interfacial debonding between the FRP and the concrete.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Chen

Teng

2012

Construction and Building Materials

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Abstract:The bond behaviour between FRP and concrete has been commonly studied using simple pull-off tests on bonded joints where an FRP plate bonded to a concrete prism is pulled at one end to induce debonding failure. Knowledge gained from such studies has been directly employed in predicting debonding failure in FRP-plated concrete beams induced by major flexural cracks, but significant differences exist between the two scenarios. The chief difference lies in the interaction between adjacent flexural cracks in a flexural member which is absent in a joint pull-off test. This interaction may be approximated using an FRP-to-concrete bonded joint where the FRP plate is pulled at both ends. This paper presents a numerical study into this bonded joint problem, with the main objective being to clarify the effect of bondline damage during slip reversals on the ultimate load. The study shows that such damage has a significant effect on the predicted bond behaviour and ultimate load when the ratio between the end loads is larger than 0.7, particularly when the bond length is reasonably large. An important implication of the present study is that in the modelling (e.g. finite element modelling) of debonding behaviour of FRP-plated RC beams where multiple cracks exist, the FRP-to-concrete interface should be represented using a bond-slip model with appropriate consideration of the damaged behaviour during slip reversals in order to achieve accurate predictions.

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Section: Introductionmentioning

confidence: 99%

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Chen

Teng

2012

Construction and Building Materials

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“…Experimental evidence confirms that concrete-FRP debonding fractures generally propagate through the concrete just above the interface [1,8]. It is however reported that due to poor surface preparation prior to plate bonding or the use of low-strength adhesives, the debonding fractures can propagate along the interface or within the adhesive [8]. With the availability of high-strength adhesives and careful surface preparation techniques, these adhesive and interface failures can be precluded.…”

Section: Concrete-frp Interface Fracture Energymentioning

confidence: 96%

Fracture Mechanics of Plate Debonding

Achintha

Burgoyne

2008

J. Compos. Constr.

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“…One of reinforcement approaches is to add steel plates on the bottom of a RC slab to enhance the exural capacity [1][2][3] . To make steel and concrete function collaborative enough, epoxy is sometimes injected as an adhesive into the interface between steel plate and concrete [4][5][6][7] . When the RC slab is further damaged, however, the reinforcement method may meet the problem of water penetration, which will cause the debonding between steel and epoxy, and serious corrosion problems due to long water-stay at the interface 8,9) .…”

Section: Introductionmentioning

confidence: 99%

Detection and Thickness Estimation of Water Layer in Layered Medium Based on Multi-Reflection of Oblique Incident Ultrasonic Wave

Shen

Hirose

2016

Mater. Trans.

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A reinforced concrete (RC) slab of a bridge is sometimes strengthened by attaching a steel plate on the bottom of the slab to enhance the exural capacity. In this case, epoxy is injected between steel plate and concrete as the adhesive, together with anchor bolts. However, the reinforcement approach has a problem of water invasion into the top surface of a steel plate through an additionally damaged concrete slab, which will lead to a serious corrosion problem of a steel plate. Hence it is of great importance to detect the existence of water layer in the steel-epoxy-concrete layered medium and acquire information on thickness and distribution area of water. In this study, an ultrasonic multi-re ection approach through oblique incidence is developed for thin liquid layer detection. Firstly, re ection and transmission coef cients of multi-layered media including a liquid layer are calculated theoretically. Experiments on multi-layered con gurations are conducted with different water layer thicknesses and bottom layer materials. By analyzing the experimental results, the existence of water layer can be clearly distinguished. Through comparison with the theoretical wave travelling time in the water layer, the thickness of the water layer can be estimated from the time interval of re ected wave groups. Different materials as a bottom layer can also affect the re ection notably, which shows good agreement with the calculated water-solid re ection coef cients.

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Progress on understanding debonding problems in reinforced concrete and steel members strengthened using FRP composites

Cited by 336 publications

References 51 publications

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Behaviour of FRP-to-concrete interfaces between two adjacent cracks: A numerical investigation on the effect of bondline damage

Fracture Mechanics of Plate Debonding

Detection and Thickness Estimation of Water Layer in Layered Medium Based on Multi-Reflection of Oblique Incident Ultrasonic Wave

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