Peeling Behavior and Spalling Resistance of Bonded Bidirectional Fiber Reinforced Polymer Sheets

Wu, Zhishen; Yuan, Hong; Asakura, Toshihiro; Yoshizawa, Hiroyuki; Kobayashi, Akiko; Kojima, Yoshiyuk; Ahmed, Ehsan

doi:10.1061/(asce)1090-0268(2005)9:3(214)

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…5% compared to those of the unstrengthened beam L1 and beam L5 strengthened by one-layer SWRs, respectively, showing the strong point of SWR strengthening. The reason why strengthening by steel plate, CFRP, or rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar could not achieve this effect was that bond failure would occur as along as the layers of applied reinforcement reached a certain level (Lorenc and Kubica, 2006;Wu et al, 2005).…”

Section: Yield Loads and Ultimate Loadsmentioning

confidence: 99%

“…The three strengthening techniques of bonded FRP laminate, steel plate and stainless steel wire all suffer from the same defect, which is that the strengthened structures are prone to premature failure of the beams as a result of plate separation. This is turn blocks the functions of reinforced materials and limits the increment of ultimate load (Wu et al, 2005). In addition, it is difficult work for a designer to predict accurately the ultimate capacity of strengthened structures with debonding failure, despite a substantial amount of correlative research.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of RC beams strengthened with distributed prestressed high-strength steel wire rope

Jiang

et al. 2010

Magazine of Concrete Research

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Based on a comparison of the advantages and disadvantages of existing strengthening methods, this paper proposes a new strengthening technique with prestressed high-strength steel wire rope (P-SWR) for reinforced concrete (RC) beams. The paper presents the theoretical basis of this new method, an experimental programme of flexural strengthening of RC beams with P-SWR, and a comparison between the results of experimental tests on the proposed methods and the results for a carbon-fibre-reinforced polymer (CFRP) sheet and steel plate. The effectiveness parameters, including the loading method (direct loading or pre-damaged loading), the layers of steel wire rope, bonding or lack of bonding between the steel wire and concrete, and the types of anchorage are discussed. Test results show that the P-SWR can significantly improve the cracking load, stiffness, yield load and ultimate load of RC beams. The final failure model for the beams strengthened with P-SWR has typical characteristics, such as steel yielding, crushed concrete and fractured steel wire ropes. The width of flexural cracks in the concrete beams is effectively controlled. This method also exploits the strain capacity of the wire rope to its limits. Furthermore, the advantages of this new technique include minimum site disruption, minimal increase in the size of the repaired member, minimum scaffolding, superiority for fire and corrosion resistance, and low cost; the method presented is therefore an attractive alternative to existing strengthening methods.

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Section: Yield Loads and Ultimate Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of RC beams strengthened with distributed prestressed high-strength steel wire rope

Jiang

et al. 2010

Magazine of Concrete Research

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“…As a result, different strengthening techniques of structure elements using various materials have been thoroughly investigated for flexural strengthening, including section enlargement (Thanoon, Jaafar, Kadir, & Noorzaei, 2005), external bonding steel plates (Jones, Swamy, & Charif, 1988), external bonding fibre reinforced polymer (FRP) (Choi, West, & Soudki, 2008;Ebead, 2011;Kim, Wight, & Green, 2008;Martin & Lamanna, 2008;Teng et al, 2006;Wu et al, 2005) and near-surface mounted (NSM) FRP strips or bars (Hajihashemi, Mostofinejad, & Azhari, 2011), external posttensioning tendons (Lorenc & Kubica, 2006), rehabilitation with steel wire mesh (Kubaisy & Jumaat 2000) have all been used to strengthen and repair of structures. The structural behaviour of cracked reinforced concrete (RC) one-way slab repaired with different techniques was investigated by Thanoon et al (2005).…”

Section: Introductionmentioning

confidence: 99%

“…Fibre reinforced polymer has a high strength to weight ratio, excellent resistance to chemical corrosion and ease of handling. Test results show that when FRP are used as externally bonded reinforcement, the flexural stiffness has very little improvement, peeling failure is often occurred without warning and the ductility is reduced extremely than unstrengthened flexural members (Choi et al, 2008;Teng et al, 2006;Wu et al, 2005). To avoid premature failure due to debonding and improve the failure ductility, some techniques have been developed, such as the NSM strengthening technique (Hajihashemi et al, 2011) and mechanically fastened anchorage systems (Ebead, 2011;Martin & Lamanna, 2008).…”

Section: Introductionmentioning

confidence: 99%

Flexural strengthening of RC beams using distributed prestressed high strength steel wire rope: theoretical analysis

Wei

et al. 2012

Structure and Infrastructure Engineering

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2014) Flexural strengthening of RC beams using distributed prestressed high strength steel wire rope: theoretical analysis, Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, 10:2, 160-174, Various strengthening techniques for structural elements using different materials have been investigated. Recently, a new, reliable and cost-effective strengthening technique with distributed prestressed high strength steel wire rope (P-SWR technique) was proposed. This paper mainly focuses on theoretical analysis of the flexural behaviour of reinforced concrete (RC) beams strengthened with the P-SWR strengthening technique. First, mechanical properties of steel wire rope such as ultimate strength, ultimate tensile strain and relaxation were tested. Second, an evaluation method, including the prediction of cracking load and flexural capacity of RC beams strengthened with P-SWR, was proposed. Third, prestressed level of P-SWR, ratio of reinforcement, and bond strength of P-SWR and concrete responsible for short-term cross-sectional stiffness were studied and associated calculation equations are suggested. Finally, according to parametric studies, an entire evaluation system, including a modified Rao & Dilger code calculation method and hypothetical tension method, as well as a simplified method for predicting the maximum crack width, is proposed. All of these analytical procedures are based on experimental studies. A great similarity between the experimental and analytic results suggests that the proposed methods are highly accurate.

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“…Wu et al [17,18] studied experimentally and analytically the peeling behavior and spalling resistance effect of unidirectional and bi-directional FRP sheets externally bonded to plane concrete surface. Simple expressions among peeling load, interfacial energy and FRP sheet stiffness were obtained, and the theoretical results were validated by comparison with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Peeling behavior and spalling resistance of CFRP sheets bonded to bent concrete surfaces

Yuan

2009

Acta Mech Sin

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In this paper, the peeling behavior and the spalling resistance effect of carbon fiber reinforced polymer (CFRP) sheets externally bonded to bent concrete surfaces are firstly investigated experimentally. Twenty one curved specimens and seven plane specimens are studied in the paper, in which curved specimens with bonded CFRP sheets can simulate the concrete spalling in tunnel, culvert, arch bridge etc., whereas plane specimens with bonded CFRP sheets can simulate the concrete spalling in beam bridge, slab bridge and pedestrian bridge. Three kinds of curved specimens with different radii of curvature are chosen by referring to practical tunnel structures, and plane specimens are used for comparison with curved ones. A peeling load is applied on the FRP sheet by loading a circular steel tube placed into the central notch of beam to debond CFRP sheets from the bent concrete surface, meanwhile full-range load-deflection curves are recorded by a MTS 831.10 Elastomer Test System. Based on the experimental results, a theoretical analysis is also conducted for the specimens. Both theoretical and experimental results show that only two material parameters, the interfacial fracture energy of CFRP-concrete interface and the tensile stiffness of CFRP sheets, are needed for describing the interfacial spalling behavior. It is found that the radius of curvature has remarkable influence on peeling load-deflection curves. The test methods and test results given in the paper are helpful and available for reference to the designer of tunnel strengthening.

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Peeling Behavior and Spalling Resistance of Bonded Bidirectional Fiber Reinforced Polymer Sheets

Cited by 14 publications

References 9 publications

Experimental study of RC beams strengthened with distributed prestressed high-strength steel wire rope

Experimental study of RC beams strengthened with distributed prestressed high-strength steel wire rope

Flexural strengthening of RC beams using distributed prestressed high strength steel wire rope: theoretical analysis

Peeling behavior and spalling resistance of CFRP sheets bonded to bent concrete surfaces

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