A Proposal of Design and Construction Method of Repair for Corroded Steel Members by Carbon Fiber Sheets

Sugiura, Hiroshi; Kobayashi, Akiko; Inaba, Naofumi; Homma, Atsushi; Ohgaki, Kazuo; Nagai, Masao

doi:10.2208/jscejf.65.106

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…(1) The steel beam strengthened with CFRP strand sheets can be designed as composite cross section; (2) The steel stress at the tip of the 1st layer of which debonding of CFRP strand sheet occurred was 280 MPa; (3) The steel stress when the debonding occurred at interlayer of CFRP strand sheet was 310 MPa; (4) A 20 mm gap between the CFRP strand sheets is required at overlap splice joint;…”

Section: Discussionmentioning

confidence: 99%

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Bonding Characteristics and Flexural Stiffening Effect of Carbon Fibre Reinforced Plastics Strand Sheets Bonded to Steel Beams

Nagai¹,

Hidekuma²,

Miyashita³

et al. 2015

JCEA

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Abstract:Corrosion of steel structures is unavoidable and the structural performance decreases dramatically due to the corrosion. As a repairing method for corroded steel members, bonding carbon fiber sheets with resin had been developed. The purpose of this study is to propose the flexural strengthening method for steel members by using CFRP (carbon fiber reinforced polymer) strand sheets. In order to clarify the stiffening effect and the debonding characteristics of CFRP strand sheets, and to optimize the strengthening design specifications, the flexural tests using high tension steel beams strengthened with CFRP strand sheets are performed. Two cases of experiments are carried out. In Experiment 1, the result from previous research is reflected in the strengthening design. Moreover in Experiment 2, the debonding characteristics obtained from Experiment 1 are reflected. As a result, it was clarified that CFRP strand sheets have stiffening effect equivalent to the theoretical value and its debonding property is practically high enough when FRP (fiber reinforcement polymer) sheets have an appropriate bonding length.

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Section: Discussionmentioning

confidence: 99%

“…This method is known as an efficient and economical method for repairing because no heavy equipment is necessary at work site. As for common reinforcing method, the continuous fiber sheet [2] and the FRP (fiber reinforcement polymer) strip [3] are being used. However, there exist some demerits on employing these materials.…”

mentioning

confidence: 99%

Bonding Characteristics and Flexural Stiffening Effect of Carbon Fibre Reinforced Plastics Strand Sheets Bonded to Steel Beams

Nagai¹,

Hidekuma²,

Miyashita³

et al. 2015

JCEA

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“…The variable 3 i is the layer number of the CFRP plate that is used to align the ends of three CFRP plates.…”

Section: Design For Aligning the Ends Of Multiple Cfrp Platesmentioning

confidence: 99%

“…Recent researches have reported on steel plates strengthened with multiple carbon fiber materials with a proposed step-length of 25 mm 2), 3) . In this method, each step-length is fixed at 25 mm regardless of the difference in the stiffness of steel members and carbon fiber materials and in the thickness of adhesive layers; but this does not turn out to be optimum for all cases.…”

Section: Introductionmentioning

confidence: 99%

Stepped-End Design for Carbon Fiber-Reinforced Plastic (Cfrp) Bonded Onto a Steel Plate Under Uni-Axial Load

Ishikawa

Miyashita

2013

Journal of JSCE

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In the application of multiple Carbon Fiber-Reinforced Plastic (CFRP) plates onto a structural steel member, stepping of the CFRP plate ends is often adopted to prevent debonding. This approach requires the nonuniform extension of CFRP plate lengths. In this study, to shorten the length of CFRP plates, a nonuniform overlapping arrangement of several CFRP plate ends was proposed and the theoretical conditions of arrangement were proposed. Additionally, the design for the stepped-end arrangement of CFRP plates under a uni-axial load was shown. It was confirmed with stress analysis that the stress in the steel plate was reduced to the design value by bonding the CFRP plate with the proposed stepped ends.

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“…Recently, retrofitting steel members with externally bonded patch plate has been widely reported 1)- 3) . Although bonded patch plate can easily improve stiffness and strength, debonding of the patch plate before yielding of the steel member has been observed 4) .…”

Section: Introductionmentioning

confidence: 99%

Failure Criteria for Debonding of Patch Plate Bonded Onto Steel Members Subjected to Bending

Shimizu¹,

Ishikawa²,

Hattori³

et al. 2014

Journal of JSCE

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Recently, externally bonded patch plates have been widely used for the repair or strengthening of steel members due to their ease of application. When the traffic loads are applied on the steel members strengthened with patch plates, shear and normal stresses are introduced to the adhesive layer especially in the vicinity of the patch plate end. Due to the higher shear and normal stresses at the end of the patch plate, the debonding of the patch plate from the steel member could occur before the yielding of steel member or patch plate. To prevent debonding of the patch plate, the shear and normal stresses in adhesive have been studied using theoretical, numerical, and Finite Element analyses. Meanwhile, the failure criterion for debonding has not been clarified. In this study, to develop the verification method for debonding, some failure criteria were compared. The compatibility of each failure criterion was validated from the debonding test.

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A Proposal of Design and Construction Method of Repair for Corroded Steel Members by Carbon Fiber Sheets

Cited by 11 publications

References 3 publications

Bonding Characteristics and Flexural Stiffening Effect of Carbon Fibre Reinforced Plastics Strand Sheets Bonded to Steel Beams

Bonding Characteristics and Flexural Stiffening Effect of Carbon Fibre Reinforced Plastics Strand Sheets Bonded to Steel Beams

Stepped-End Design for Carbon Fiber-Reinforced Plastic (Cfrp) Bonded Onto a Steel Plate Under Uni-Axial Load

Failure Criteria for Debonding of Patch Plate Bonded Onto Steel Members Subjected to Bending

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