Effective Bond Length of Carbon-Fiber-Reinforced Polymer Strips Bonded to Fatigued Steel Bridge I-Girders

Nozaka, Katsuyoshi; Shield, Carol K.; Hajjar, Jerome F.

doi:10.1061/(asce)1084-0702(2005)10:2(195)

Cited by 102 publications

(59 citation statements)

References 8 publications

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“…Moreover, this bond strength increases with bond length but when it reaches a threshold value, any further increase in the bond length does not lead to an increase in the bond strength. Nozaka et al [5] further indicated that the effective bond length is the bond length that produces the maximum possible stress or the shortest bond length that maximises the load transferred into the CFRP repair. Based on the experimental results, the critical plastic shear stress p of the bondline was estimated from the initial slope of the f-L curve.…”

Section: Behaviour Of Double Strap Shear Jointmentioning

confidence: 99%

“…FRP composite repairs offer other advantages: they can be shaped to almost any substrate geometry, they can be optimised and designed to avoid introducing unwanted load paths by using the anisotropy of the composite material, and they can be very lightweight, thus avoiding the need for heavy lifting equipment during repairs. Moreover, using composites in rehabilitation does not require closing of the bridge to traffic [5]. These advantages present great opportunities for the utilisation of FRP composites for strengthening and rehabilitating of steel structures.…”

Section: Introductionmentioning

confidence: 99%

“…Equally important is the determination of the effective bond length for CFRP laminates adhered to the steel to effectively utilise the composite material beam [5].…”

Section: Introductionmentioning

confidence: 99%

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Pre-impregnated carbon fibre reinforced composite system for patch repair of steel I-beams

Manalo

Sirimanna

Karunasena

et al. 2016

Construction and Building Materials

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Section: Behaviour Of Double Strap Shear Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre-impregnated carbon fibre reinforced composite system for patch repair of steel I-beams

Manalo

Sirimanna

Karunasena

et al. 2016

Construction and Building Materials

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“…Nozaka et al (2005) investigated the effective bond length of CFRP strips bonded to cracked steel bridge girders and presented an equation to estimate the effective bond length for that particular application. The experimental test setup consisted of a W14x68 section with an additional steel plate bolted to the bottom flange for ease of CFRP removal upon test completion and reuse of the test setup.…”

Section: Limitations To the Use Of Frp Retrofit Measures For Steelmentioning

confidence: 99%

Conceptual Investigation of Partially Buckling Restrained Braces

Abraham¹,

Harries²

2007

Structural Engineering Research Frontiers

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Although in its infancy, leveraging high strength fiber reinforced polymer (FRP) materials for retrofit of steel structures has been the focus of recent investigations. Studies include the application of FRP to steel for flexural and fatigue or fracture retrofit as well as improving steel member stability. The research presented in this thesis attempts to introduce the concept of an FRP-stabilized steel member through a retrofit application creating a Partially Buckling Restrained Brace (PBRB). A PBRB seeks to increase steel brace stability and hysteretic energy dissipation during a seismic event through the strategic application of bonded FRP materials along its length.Six 65 ½" long A992 Gr. 50 WT6x7 steel braces were tested under cyclic compressive loading to failure. Two braces were retrofitted with carbon FRP (CFRP) and two braces were retrofitted with glass FRP (GFRP). One brace was encased in an HSS 7 x 0.125" steel tube and filled with grout to create a conventional Buckling Restrained Brace (BRB). The final brace was an unretrofit control specimen. Two arrangements of FRP materials were used for both the CFRP and GFRP retrofit braces: (1) 2" wide strip was applied to each side of the stem of the WT, and (2) 1" wide strips were applied to each side of the stem in an effort to optimize the retrofit application.The GFRP specimens increased the axial capacity of the brace by 6% and 9%, whereas the CFRP specimens had no effect. The observed variability in axial capacity was largely a result iv of initial loading eccentricities. The GFRP specimens did however show greater control over residual deflections suggesting that the retrofit can delay the formation of a plastic hinge within the brace and maintain compressive capacity through several cyclic loading loops. All of the FRP-retrofit specimens reduced weak-axis lateral displacement of the braces and showed increased control of local behavior. However, the brace is not dominated by local behavior due to its length, and this application may be better suited to shorter braces, similar to those found as cross frames between bridge girders, or to control local buckling in steel I-shaped beams.v

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“…Studies carried out in early stage, have proven that the CFRP systems effectively enhance the structural performance of structures (Vatovac et al 2002, Jiao et al 2004,Colombi et al 2006,Photiou et al 2006,Fawziaet al 2007). Research was further extended to determine the bond characteristics between CFRP and steel because majority of the failure was observed at the CFRP-steel interface (Fawzia et al 2005, Matta et al, 2005.As a result of further investigation, it is known that a major cause of failure in steel to CFRP joints is composite delamination (Nozaka et al 2005) and design guidelines have been developed to assist the development of methodologies for applying CFRP to steel surfaces (Schnerch et al 2007, Fernando et al 2013) . All of the above research focused on the performance and effectiveness of CFRP systems.Researchers extended their scope to determine durability of CFRP/steel systems.…”

Section: Introductionmentioning

confidence: 99%

Bond characteristics of strengthened and retrofitted steel by smart CFRP technique

Batuwitage

Fawzia²,

Liu³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Usage of new smart materials in retrofitting of structures has become popular within last decade. Carbon fiber reinforced polymer (CFRP) has been widely used in retrofitting and strengthening of concrete structures and its usage in metallic structures is still in the developing stage. The variation of mechanical properties of CFRP and the consequent effects on strengthening and retrofitting CFRP systems are yet to be investigated under different loading and environmental conditions. This paper presents the results of CFRP strengthened and retrofitted corroded steel plate double strap joints under tension. An accelerated corrosion cell has been developed to accelerate the corrosion of the steel samples and CFRP strengthened samples. The results show a direct comparison of bond characteristics of CFRP strengthened and retrofitted steel double strap joints.

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Effective Bond Length of Carbon-Fiber-Reinforced Polymer Strips Bonded to Fatigued Steel Bridge I-Girders

Cited by 102 publications

References 8 publications

Pre-impregnated carbon fibre reinforced composite system for patch repair of steel I-beams

Pre-impregnated carbon fibre reinforced composite system for patch repair of steel I-beams

Conceptual Investigation of Partially Buckling Restrained Braces

Bond characteristics of strengthened and retrofitted steel by smart CFRP technique

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