Experimental determination of critical loads in thin-walled bars with Z-section subjected to warping torsion

Kowal, Z.; Szychowski, Andrzej

doi:10.1016/j.tws.2013.10.020

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…Unfortunately, in the available literature, there is a shortage of works devoted to the steel thin-walled cold-formed beams subjected to bending reinforced by CFRP. Among the others, few include publications on research and numerical analyses of even unreinforced beams made of cold-formed Z [ 11 , 12 , 13 ], channel [ 14 ], or sigma [ 15 ] cross-sections. Recently, there have also been some works demonstrating bending in the case of composite beams [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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In this paper, the retrofitting method of thin-walled, cold-formed sigma beams using bonded carbon fibre reinforced polymer (CFRP) tapes is proposed. The effectiveness of the presented strengthening method is investigated by the means of laboratory tests and numerical analysis conducted on simply supported, single-span beams made of 200 × 70 × 2 profile by “Blachy Pruszyński” subjected to a four-point bending scheme. Special attention is paid to the evaluation of possibility to increase the load capacity with simultaneous limitation of beams displacements by appropriate location of CFRP tapes. For this purpose, three beams were reinforced with CFRP tape placed on the inner surface of the upper flange, three with CFRP tape on the inner surface of the web, three beams with reinforcement located on the inner surface of the bottom flange, and two beams were tested as reference beams without reinforcement. CFRP tape with a width of 50 mm and a thickness of 1.2 mm was used as the reinforcement and was bonded to the beams by SikaDur®-30 adhesive. Precise strain measurement was made using electrofusion strain gauges, and displacement measurement was performed using two Aramis coupled devices in combination with the Tritop machine. Numerical models of the considered beams were developed in the Finite Element Method (FEM) program Abaqus®. Experimental and numerical analysis made it possible to obtain a very high agreement of results. Based on the conducted research, it was proved how important is the impact of the applied reinforcement (CFRP tapes) in thin-walled steel structures, with respect to the classic methods of strengthening steel building structures.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The ribs lengthen below the roof of the chapels on the south façade while they are removed at the cloister roof on the north façade, they are replaced by reinforced concrete supports. The ribs inclusion is justified as a stiffening element in front of biaxial bending and torsion loads caused by the asymmetrical and uneven geometry of the plates and in order to avoid elastic instability [13,14,15]. However, they play a second role as rigid cantilever elements where the horizontal plates of the roof of the temple and the chapel are supported [16].…”

Section: Description Of the Structure 31 The Folded Platesmentioning

confidence: 99%

Two Post-tensioned Thin Folded Plates Designed by E. Torroja for San Nicolás Church

Fenollosa

Arnáez

Alonso

et al. 2017

Period. Polytech. Civil Eng.

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“…[1,8,9,19,32] and experimental e.g. [2,11,15,21,25,26] investigations, it was stated the rotational spring stiffness (Cθ) of the CP supported edge is most affected by the plate (RP) that is directly adjacent to CP, on the assumption that the plates are rigidly connected along the edge they share. The rotational spring stiffness resulting from the action of RP can be determined from formula: It should be noted that in formula (3.8), the expression in parenthesis accounts, in an approximate manner, for the disadvantageous effect of compressive stress in RP [18].…”

Section: Boundary Conditions Of the Critical Platementioning

confidence: 99%

Computation of Thin-Walled Cross-Section Resistance to Local Buckling with the Use of the Critical Plate Method

Szychowski

2016

Archives of Civil Engineering

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1Thin-walled bars currently applied in metal construction engineering belong to a group of members, the cross section res i stance of which is affected by the phenomena of I ocal or distortional stability loss. This results from the fact that the cross-section of such a bar consists of slender-plate elements. The study presents the method of calculating the res i stance of the cross-section susceptible to local bucki ing which is based on the loss of stability of the weakest plate (wali). The "Critical Plate" (CP) was identified by comparing critical stress in cross-section component plates under a given stress condition. Then, the CP showing the lowest critical stress was modelled, depending on boundary conditions, as an interna( or cantilever element elastically restrained in the restraining plate (RP). Longitudinal stress distribution was accounted for by means of a constant, linear or non-linear (acc. the second degree parabola) fu nction. For the critical buckling stress, as calculated above, the ]ocal critical resistance of the cross-section was determined, which sets a limit on the validity of the Vlasov theory. In order to determine the design ultimate resistance of the cross-section, the effective width theory was applied, while taking inio consideration the assumptions specified in the study. The application of the Critical Plate Method (CPM) was presented in the examples. Analytical calculation results were compared with selected experimental f i ndings.lt was demonstraled that taking into consideration the CP elastic restrainl and longitudinal stress variation results in amore accurate representation ofthin-walled element behaviour in the engineering computational model.

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Experimental determination of critical loads in thin-walled bars with Z-section subjected to warping torsion

Cited by 9 publications

References 8 publications

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

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

Two Post-tensioned Thin Folded Plates Designed by E. Torroja for San Nicolás Church

Computation of Thin-Walled Cross-Section Resistance to Local Buckling with the Use of the Critical Plate Method

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