Tests and design approach for plain channels in local and coupled local-flexural buckling based on eurocode 3

Ungermann, Dieter; Lübke, Sebastian; Brune, Bettina

doi:10.1016/j.tws.2013.09.013

Cited by 19 publications

(13 citation statements)

References 4 publications

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“…The basis to allow for element interaction was laid by considering outstand and internal rectangular plates restrained elastically along the unloaded adjoining edges. Since then, a number of analytical, experimental and numerical studies have been carried out examining the effects of element interaction on the elastic and inelastic local buckling behaviour of various cross-section profiles including I-sections [21][22][23][24][25][26][27][28][29][30][31], rectangular hollow sections [32][33][34][35], cold-formed sections [36][37][38][39] and hot-rolled steel profiles [8]. Recently, Generalized Beam Theory was used to develop semi-analytical expressions for the buckling coefficient k of rectangular hollow sections under combined axial force and bi-axial bending [35].…”

Section: Elastic Local Buckling Of Cross-sectionsmentioning

confidence: 99%

Formulae for Calculating Elastic Local Buckling Stresses of Full Structural Cross-sections

2019

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Formulae for determining the full cross-section elastic local buckling stress of structural steel profiles under a comprehensive range of loading conditions, accounting for the interaction between the individual plate elements, are presented. Element interaction, characterised by the development of rotational restraint along the longitudinal edges of adjoined plates, is shown to occur in cross-sections comprising individual plates with different local buckling stresses, but also in cross-sections where the isolated plates have the same local buckling stress but different local buckling half-wavelengths. The developed expressions account for element interaction through an interaction coefficient ζ that ranges between 0 and 1 and are bound by the theoretical limits of the local buckling stress of the isolated critical plates with simply-supported and fixed boundary conditions along the adjoined edges. A range of standard European and American hot-rolled structural steel profiles, including I-sections, square and rectangular hollow sections, channel sections, tee sections and angle sections, as well as additional welded profiles, are considered. The analytical formulae are calibrated against results derived numerically using the finite strip method. For the range of analysed sections, the elastic local buckling stress is typically predicted to within 5% of the numerical value, whereas when element interaction is ignored and the plates are considered in isolation with simply-supported boundary conditions along the adjoined edges, as is customary in current structural design specifications, the local buckling stress of common structural profiles may be under-estimated by as much as 50%. The derived formulae may be adopted as a convenient alternative to numerical methods in advanced structural design calculations (e.g. using the direct strength method or continuous strength method) and although the focus of the study is on structural steel sections, the functions are also applicable to cross-sections of other isotropic materials.

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Section: Elastic Local Buckling Of Cross-sectionsmentioning

confidence: 99%

Formulae for Calculating Elastic Local Buckling Stresses of Full Structural Cross-sections

2019

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“…The ends of the specimens were machined flat, with the load applied at the centroid of the sections. Specimen measurements were completed to record any discrepancies as outlined by Ungermann et al [19]. The tests were completed until the failure which is defined as the axial load where the section has lost all its rigidity and permanent deformation occurs.…”

Section: Buckling Test Proceduresmentioning

confidence: 99%

A Comparison Investigation into Analysis Methods to Determine the Buckling Capacity of South African Cold-Formed Steel Lipped Channel Sections

Vuuren¹,

Mahachi²

2021

International Conference on Civil, Structural and Transportation Engineering

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This paper presents a comparison investigation into analysis methods to determine the buckling capacity of South African cold-formed steel lipped channel sections. The research considers the evaluation of buckling capacities of five different column lengths using five different methods: 1. experimental tests; 2. the Direct Strength Method (DSM) as prescribed in SANS 10162-2; 3. Eurocode 3; 4. simplified Finite Element Analysis (FEA), i.e. only beam modelling elements; and 5. finely refined FEA, i.e. plate modelling elements. All columns have a 75 x 50 x 20 x 2.0 (h x b x c x t mm) cold-formed lipped channel cross-section. A comparison of the experimental buckling results to the aforementioned methods shows that the Eurocode 3 and DSM buckling resistance values overestimate the buckling loads by 23.8% and 12.7%, respectively. For the two Finite Element Model (FEM) buckling analyses; the simplified FEA method yields an overestimation of 76.9% and the finely refined FEA yields an overestimation of 74.8%. It is recommended that the DSM is used to calculate the buckling resistance of cold-formed lipped channels.

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“…Considerable research has been undertaken in the area of mode interaction between local, distortional and/or flexural/flexural–torsional or combinations of these (Dinis et al, 2014a; Dubina et al, 2013a; Loughlan and Yidris, 2014; Martins et al, 2014a, 2014b; Rizzi et al, 2013; Santos et al, 2014; Ungermann et al, 2014). Based on this research, there is a need to review some of the design rules in existing standards and specifications to further account for the interactions.…”

Section: Section Buckling and Design Including Gbt Fsm And Dsmmentioning

confidence: 99%

Cold-formed steel structures: Research review 2013–2014

Hancock

2016

Advances in Structural Engineering

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This article reviews research on cold-formed steel structures published in 2013 and 2014 in three leading journals: the Journal of Structural Engineering, ASCE, Thin-Walled Structures and the Journal of Constructional Steel Research. It also reviews papers published in the three main conferences in the area over the same period. These are Eurosteel 2014 (Naples, Italy), the 7th International Conference on Thin-Walled Structures (Busan, Korea) and the 22nd International Specialty Conference on Cold-Formed Steel Structures (St Louis, MO, USA). Three research areas which have recently been incorporated in the North American Specification NAS S100:2012 or are being incorporated in the Australian/New Zealand Standard AS/NZS 4600 have been highlighted. These are the works on the semi-analytical finite strip method for sections in shear by the author and his colleagues at the University of Sydney, net section rupture by Associate Professor Lip Teh at the University of Wollongong and fire design by Professor Mahendran at Queensland University of Technology.

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Tests and design approach for plain channels in local and coupled local-flexural buckling based on eurocode 3

Cited by 19 publications

References 4 publications

Formulae for Calculating Elastic Local Buckling Stresses of Full Structural Cross-sections

Formulae for Calculating Elastic Local Buckling Stresses of Full Structural Cross-sections

A Comparison Investigation into Analysis Methods to Determine the Buckling Capacity of South African Cold-Formed Steel Lipped Channel Sections

Cold-formed steel structures: Research review 2013–2014

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