Axial capacity and design of thin-walled steel SHS strengthened with CFRP

Bambach, Michael Richard; Jama, Hussein Haji; Elchalakani, Mohamed

doi:10.1016/j.tws.2008.10.006

Cited by 163 publications

(76 citation statements)

References 10 publications

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“…The values of the basic geometry and material parameters are in Table 1, and the details of the experiments are in literature [19]. The elastic buckling loads P crExp are determined from the experiments by two methods, and averaged; These two methods are the load-axial displacement curve and the load-transverse displacement squared method [14,20]. The experimental critical stress f crExp can be calculated by P crExp /(bt t ), where t t represents the total thickness of the plate.…”

Section: Comparison With the Experimental Resultsmentioning

confidence: 99%

“…After performing the eigenvalue analysis, the lowest eigenvalue, λ 1 , can be expressed as Equation (13), so (α D K u ) can be expressed as Equation (14). It should be noted that α D is equal to 1 as ω = 0 regardless of other parameters, so we let ω = 0 to study the variation of K u as d/b, β, e x /b, e y /b and BCs change.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Sci. 2017, 7, 1188 3 of 25 mechanical properties of compressed members are derived from the behaviors of the individual plate elements that make up the section [14], so the edges between two individual plates are in a state between rotatable and fixed constraint, and the edges are free when the edges have no adjacent edges. The critical case of simply supported edge is selected for conservative calculation for the edges in a state between rotatable and fixed constraint in this paper.…”

Section: Boundary Conditions (Bcs) Of the Platementioning

confidence: 99%

“…Haedir and Zhao [11] tested ten short cold-formed steel circular hollow section (CHS) columns with externally bonded hoop and longitudinal CFRP, the results show that the reinforcing hoop fibers provide better restraining force to postpone the steel skin buckling when the local slenderness ratio is higher, it also shows that the use of a combination of hoop and longitudinal CFRP in a slender tube can promote the attainment of the yield capacity of the bare tube. Bambach [12][13][14] tests a CFRP wrapped square hollow sections (SHS) columns with width-to-thickness ratio varying from 12.5 to 120. The experimental results show that the axial capacity of the wrapped SHS is up to twice of that without wrapping the CFRP, due to the restraining on the development of elastic buckling deflections from the wrapping CFRP.…”

Section: Introductionmentioning

confidence: 99%

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Elastic Stability of Perforated Plates Strengthened with FRP under Uniaxial Compression

2017

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Abstract:Openings are frequently introduced in plates for the purpose of inspection, maintenance, service, etc. The presence of openings reduces the buckling and ultimate capacity significantly, and pasting fiber-reinforced polymers (FRP) is an ideal technique for postponing the buckling and increasing the ultimate capacity of the plates. In this paper, the finite element (FE) method has been employed to study the buckling stress of the perforated plates strengthened with FRP under uniaxial compression, and several parameters are considered: material's geometrical and mechanical properties, boundary conditions, plate aspect ratio, hole sizes, and hole position. Then a method of calculating the buckling stress is proposed and modified based on the theory of composite plate and the numerical results. The study shows that, the stiffness modified factor α D , which considers the orthotropic properties of FRP are a function of the reinforcement index ω and hole size d/b for Boundary conditions (BCs) of 4S and 3S1F. And it is recommended to place the big hole close to the middle area of the plate in x-axis. It also shows that for a small hole size, there is little effect of the hole position e y /b on buckling coefficient K u regardless of the BCs, and that effect becomes more pronounced as d/b increases, so it is recommended to put the holes near the middle of the plate for 4S and the simple support edge for 3S1F in y-axis.

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Section: Comparison With the Experimental Resultsmentioning

confidence: 99%

Section: Methods Of Analysismentioning

confidence: 99%

Section: Boundary Conditions (Bcs) Of the Platementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elastic Stability of Perforated Plates Strengthened with FRP under Uniaxial Compression

2017

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“…is the area of the equivalent steel section. Bambach et al (2009) investigated axial capacity and design of thin-walled steel square hollow section [SHS] strengthened with externally bonded CFRP. The SHS were fabricated by spot-welding and had plate width-to-thickness ratios between 42 and 120, resulting in plate slenderness ratios between 1.1 and 3.2.…”

Section: Design Of Circular Hollow Steel Section With Cfrpmentioning

confidence: 99%

Axially Loaded Steel Columns Strengthened with CFRP

Kalavagunta

Naganathan²,

Mustapha³

2014

jjce

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During the recent decades, Carbon Fiber-Reinforced Polymer (CFRP) composite materials have proven valuable properties and suitability to be used in the construction of new buildings and in upgrading the existing ones. The objective of this paper is to review the previous work in this area and compare it with the current experimental results to show the design equations for CFRP strengthened steel structural elements. Research findings have shown that CFRP sheets and strips are not only effective in restoring the lost capacity of a damaged steel section, but are also quite effective in strengthening of steel sections to resist higher loads, extend their fatigue life and reduce crack propagation.

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Structural behavior of sigma‐type thin‐walled cold‐formed steel beams reinforced with CFRP textile

Rzeszut,

Dybizbański

2023

ce papers

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The purpose of the research presented in this article was to verify the advanced numerical model. The model was made in ABAQUS software using the finite element method (FEM). The verification consisted of comparing the force‐displacement relationship for the numerical model and results from full‐scale laboratory tests. The research conducted concerns the strengthening of thin‐walled cold‐formed steel sigma beams with CFRP mats. The originality of the proposed strengthening method lies in the fact that the mats are bonded across the cross‐section to form a segmental closed cross‐section. Full‐scale laboratory tests were conducted on three Σ200×70×2 beams subjected to four‐point bending. SikaWrap 230 C CFRP mats and SikaDur 330 adhesive were used to reinforce the beams. The mats were applied to the edge bends of the beams at a width of 300 mm. It was stated that the current numerical model, despite its high degree of sophistication, does not fully meet the conditions obtained in the laboratory.

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Axial capacity and design of thin-walled steel SHS strengthened with CFRP

Cited by 163 publications

References 10 publications

Elastic Stability of Perforated Plates Strengthened with FRP under Uniaxial Compression

Elastic Stability of Perforated Plates Strengthened with FRP under Uniaxial Compression

Axially Loaded Steel Columns Strengthened with CFRP

Structural behavior of sigma‐type thin‐walled cold‐formed steel beams reinforced with CFRP textile

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