Rehabilitation of thin walled steel beams using CFRP fabric

Bastani, Amirreza; Das, Sreekanta; Kenno, Sara Y.

doi:10.1016/j.tws.2019.106215

Cited by 15 publications

(21 citation statements)

References 18 publications

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“…While the literature includes studies concerning the CFRP reinforcement of cold-formed steel compression elements with circular- [14], channel- [15,16] or hat-shaped sections [17], it is very difficult to find research on beams. The few available include tests of CFRP-reinforced, thin-walled steel T-beams subjected to bending, described in [18], and yet cold-formed steel elements are used, for example, to create purlins in steel halls and (in two-branch systems) as a steel girders. In response to inquiries from the industry concerning the possibility of reinforcing thin-walled steel purlins made of sigma profile, the authors of this paper began laboratory tests with reference to the reinforcement of cold-formed sigma steel beams with composite tapes.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research

et al. 2020

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The presented research is a part of a broader study of strengthening methods closely associated with cold-formed sigma steel beams with tapes made of Carbon Fiber Reinforcement Polymer/Plastic (CFRP). The presented results are a continuation and extension of the tests described in previous work by the authors and refer to high-slenderness thin-walled steel sigma beams subjected to a significant large rotation. The main idea of this expanded study was to identify the effectiveness of CFRP tapes with respect to different locations, namely at a bottom-tensioned or upper-compressed flange. Six beams with a cross-section of an Σ140 × 70 × 2.5 profile by “Blachy Pruszyński” and made of S350GD steel with a span of L = 270 cm were tested in the four-point bending scheme. Two beams, taken as reference, were tested without reinforcement. The remaining beams were reinforced with the use of a 50-mm wide and 1.2-mm thick Sika CarboDur S512 CFRP tape, with two beams reinforced by placing the tape on the upper flange and two with tape located on the bottom flange. The CFRP tape was bonded directly to the beams (by SikaDur®-30 adhesive). Laboratory tests were aimed at determining the impact of the use of composite tapes on the limitation of displacements and deformations of thin-walled structures. In order to perform a precise measurement of displacement, which is, in the case of beams subjected to large rotations, a very difficult issue in itself, the Tritop system and two coupled lenses of the Aramis system were used. Electrofusion strain gauges were used to measure the deformation. In the next step, numerical models of the analyzed beams were developed in the Abaqus program. Good compliance of the results of laboratory tests and numerical analyses was achieved. The obtained results confirm the beneficial effect of the use of tapes (CFRP) on the reduction in displacements and deformations of steel cold-formed elements.

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Section: Introductionmentioning

confidence: 99%

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research

et al. 2020

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“…Earlier researches classified six different failure modes for bonded FRP-steel systems: failure at the steel-adhesive interface, failure at the FRP-adhesive interface, adhesive layer failure, FRP delamination, FRP rupture and steel yielding [4][5]. The behavior of steel beams externally reinforced by bonded FRP laminates was examined thoroughly during the last two decades [6][7][8][9][10]. In 2007 design guidelines for strengthening steel beams using bonded FRP composites were proposed considering the different failure modes of bonded FRP-steel system along with the instructions for surface preparation [11].…”

Section: Introductionmentioning

confidence: 99%

Performance of Steel I-Beams Strengthened by Fastening Hybrid FRP Strips

AbouEl-Hamd¹,

Sweedan²,

El-Ariss³

2020

Proceedings of the 4th International Conference on Civil, Structural and Transportation Engineering (ICCSTE'19)

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“…Most scientific research on the topic of FRP reinforcements and adhesives have been developed in the last five years. In most cases, carbon fibers were applied in the composition of FRP reinforcement [4][5][6][7][8][9][10], while some studies considered glass fibers [4,5,[10][11][12][13] or basalt fibers [14]. Furthermore, the FRP material as reinforcement was applied in different manners, as profiled shape ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The literature indicates that the beam strength increase provided by the FRP reinforcement ranges from 5 to 60% and relies on a series of parameters, such as the amount of fiber layers, fiber orientation and type of adhesive used in connection between reinforcement and beam web. In addition, reinforcement effectiveness is improved when the fibers are oriented towards the diagonal orientation of the beam [6,7,8,13,14]. It is recommended the use of epoxy adhesives, since higher ductility could be achieved when compared to the traditional adhesives [13].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Strengthened Slender I‐girders With Fiber Reinforced Polymers

et al. 2019

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This study demonstrates the feasibility of applying diagonal reinforcements composed by fiber reinforced polymers (FRP) on the web surface of slender steel I‐girders. The use of such reinforcements contributes to a higher shear buckling strength capacity of the beam panels. This strengthening technique was evaluated by means of numerical analysis using the finite element software Abaqus®. In the analyzed models the connection between the reinforcement of composite material and the beam was made by structural adhesives. Additionally, beams with traditional diagonal reinforcements made of welded steel plate were simulated for comparison purposes, as well as another model without any diagonal reinforcement.

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Rehabilitation of thin walled steel beams using CFRP fabric

Cited by 15 publications

References 18 publications

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research

Performance of Steel I-Beams Strengthened by Fastening Hybrid FRP Strips

Numerical Study of Strengthened Slender I‐girders With Fiber Reinforced Polymers

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