Application of Fiber Reinforced Polymer Overlays to Extend Steel Fatigue Life

Jones, Sean C.; Civjan, Scott A.

doi:10.1061/(asce)1090-0268(2003)7:4(331)

Cited by 174 publications

(67 citation statements)

References 2 publications

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“…Jones and Civjan [10] analyzed the fatigue behavior of steel plates notched either from a central hole or from the edges (double edge notched tension) with respect to the CFRP system and bond geometry. The effects of one or two side reinforcements and of an application prior or subsequent to crack propagation were also taken into account.…”

Section: Previous Studiesmentioning

confidence: 99%

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Fatigue crack growth in CFRP-strengthened steel plates

Colombi

Fava

Sonzogni

2015

Composites Part B: Engineering

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a b s t r a c tIn this paper fatigue crack growth in steel plates reinforced by using carbon fiber reinforced (CFRP) strips is investigated from the experimental, numerical and analytical point of view. Single edge notched tension (SENT) specimens were strengthened with different reinforcement configurations and tested at a stress ratio R of 0.4. Different initial damage levels were considered and the experimental results showed that the reinforcement application can effectively reduce the crack growth rate and significantly extend the fatigue life. Numerical models (finite elements) were also developed to evaluate the stress intensity factor (SIF) and the crack opening displacement (COD) profile. Based on the numerical results, an analytical model was proposed to predict the fatigue crack growth rate and the fatigue crack growth curves. The analytical results are validated by comparing the fatigue crack growth curves to the experimental ones.

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Section: Previous Studiesmentioning

confidence: 99%

“…The effective SIF range is evaluated by using Eqs. (5) and (10). In particular, the effective stress ratio q is evaluated by means of Eq.…”

Section: Fatigue Lifementioning

confidence: 99%

Fatigue crack growth in CFRP-strengthened steel plates

Colombi

Fava

Sonzogni

2015

Composites Part B: Engineering

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“…The application of CFRP overlays for repair of fatigue cracks and increasing fatigue life was studied by Jones and Civjan (2003). The specimens consisted of 29 cold-rolled A36 steel bars subjected to either a center hole with crack initiator or an edge notch.…”

Section: Fatigue and Fracture Repair Of Steel With Frpmentioning

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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“…A literature survey revealed several studies in the last decade on steel structures strengthened with non-prestressed Fiber Reinforced Polymer (FRP) laminates, see e.g., [6][7][8][9][10][11][12][13][14]; Schnerch et al [15] even proposed design rules and installation procedures for strengthening of steel bridges with FRP strips, focusing on high modulus CFRP laminates. The increase of the fatigue resistance of steel structures by externally bonding non-prestressed CFRP laminates has been less studied [8][9][10][11] and the fatigue life increases reported are limited to a factor of 3.4 for normal modulus CFRP laminates (E 11 < 200 GPa).…”

Section: Introductionmentioning

confidence: 99%

“…The increase of the fatigue resistance of steel structures by externally bonding non-prestressed CFRP laminates has been less studied [8][9][10][11] and the fatigue life increases reported are limited to a factor of 3.4 for normal modulus CFRP laminates (E 11 < 200 GPa). Little research has been reported on the use of prestressed CFRP laminates for strengthening steel structures [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

CFRP-Strengthening and Long-Term Performance of Fatigue Critical Welds of a Steel Box Girder

et al. 2014

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Empa's research efforts in the 1990s provided evidence that a considerable increase of the fatigue strength of welded aluminum beams can be achieved by externally bonding pultruded carbon fiber reinforced polymer (CFRP) laminates using rubber-toughened epoxies over the fatigue-weak welding zone on their tensile flange. The reinforcing effect obtained is determined by the stiffness of the unidirectional CFRP laminate which has twice the elastic modulus of aluminum. One can therefore easily follow that an unstressed CFRP laminate reinforcement of welded beams made of steel will not lead to a substantial increase in fatigue strength of the steel structure. This consideration led to the idea of prestressing an external reinforcement of the welded zone. The present investigation describes experimental studies to identify the adhesive system suitable for achieving high creep and fatigue strength of the prestressed CFRP patch. Experimental results (Wöhler-fields) of shear-lap-specimens and welded steel beams reinforced with prestressed CFRP laminates are presented. The paper concludes by presenting a field application, the reinforcement of a steel pendulum by adhesively bonded prestressed CFRP laminates to the tensile flanges of the welded box girder. Inspections carried out periodically on this structure revealed neither prestress losses nor crack initiation after nine years of service.

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Application of Fiber Reinforced Polymer Overlays to Extend Steel Fatigue Life

Cited by 174 publications

References 2 publications

Fatigue crack growth in CFRP-strengthened steel plates

Fatigue crack growth in CFRP-strengthened steel plates

Conceptual Investigation of Partially Buckling Restrained Braces

CFRP-Strengthening and Long-Term Performance of Fatigue Critical Welds of a Steel Box Girder

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