Experimental and numerical analysis on the structural behaviour of cold-formed steel beams

Laím, Luís; Rodrigues, João Paulo C.; Silva, Luís Simões da

doi:10.1016/j.tws.2013.06.008

Cited by 101 publications

(40 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Stress-strain relationship of CFS profiles was described by a gradual yielding behaviour followed by a considerable period of strain hardening, whereas an elastic-perfectly plastic behaviour was assumed for the steel screws [17]. The stress-strain curve used in the finite element analysis (FEA) for the CFS profiles was based on tensile coupon test results and at the same time on other studies of literature [14,15,17,23], with a nominal yield strength of 320 MPa, a tensile strength of 390 MPa and a modulus of elasticity of 210 GPa. Residual stresses and cold-work of forming (where the apparent yield stress in the corners is increased) were ignored in these analyses, in other words, the mechanical properties of steel were assumed to be uniform across the crosssection, like other researchers in this field did [9,24].…”

Section: Materials Modellingmentioning

confidence: 99%

“…CFS sections can be still strengthened by connecting two or more sections together, for example, an I-section formed by connecting two channel sections back-to-back, and a box section formed by connecting two channel sections in the flanges [13]. Compound sections can lead to a better use of the material's structural properties and to a delay of the failure modes including local and/or distortional buckling [14]. Another interesting point is that up-to-date, studies on CFS members with edge and web stiffeners under fire conditions are very limited.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

10.26: Parametric numerical analysis of cold‐formed steel Σ‐shaped beams under fire

Laím

Rodrigues

2017

ce papers

Self Cite

View full text Add to dashboard Cite

A numerical investigation into the structural behaviour of cold formed steel beams commonly used in warehouses and industrial buildings subjected to fire is presented in this paper. The structural performance of cold-formed steel beams under fire conditions has been studied over the last years. However, the great majority of them have been performed on single and lipped channel beams and assumed that the internal forces and moments at supports of the members remain unchanged throughout the fire exposure. Hence, a detailed parametric numerical investigation into the response of axially and rotationally restrained compound cold-formed steel beams in fire has been addressed in this paper. Therefore, in the first phase of this research, a suitable finite element model was developed and calibrated with results of experimental fire tests previously carried out by the authors. And then, a parametric analysis was undertaken using the calibrated finite element model with the purpouse of investigating numerically the effect of some parameters such as section geometry, initial applied load on the beam, slenderness and the influence of those two ki nds of elastic restraint on the critical temperature of the beams. Finally, the results of this research showed mainly that the critical temperature of this type of beams with elastically restrained thermal elongation may drop significantly and, beyond a certain value of axial or rotational stiffness of the surrounding structure it may be no longer possible to change the fire response of them.

show abstract

Section: Materials Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

10.26: Parametric numerical analysis of cold‐formed steel Σ‐shaped beams under fire

Laím

Rodrigues

2017

ce papers

Self Cite

View full text Add to dashboard Cite

show abstract

“…Li et al [3] investigated the impact of installation errors and fastener spacing on the ultimate strength of built-up box and I-section columns via extensive parametric studies in ANSYS and concluded that the fastener spacing and arrangement can affect the failure load. Laim et al [4] conducted parametric studies in ABAQUS software to find out the influence of cross-sectional dimensions on the flexural behaviour of CFS built-up openand closed-section beams. They modelled the self-drilling screws with 3D solid elements and the numerical results suggested a reduction in the strength-to-weight ratio as the considered span increases.…”

Section: Introductionmentioning

confidence: 99%

07.20: Application of the compound strip method in buckling analysis of cold‐formed steel built‐up sections

2017

View full text Add to dashboard Cite

In this paper, the compound strip method is utilised and extended for the stability analysis of cold-formed steel built-up sections. The discrete fasteners are incorporated in the analysis such that they can be placed anywhere within the length of the member. A beam element with geometrical and material properties of the fastener is adopted to model the connection between the individual sections. The stiffness matrix terms for the connection element are derived and added directly to the global stiffness matrix of the considered built-up sections. The proposed numerical technique is verified through various examples and the results are compared with the finite element solutions. The results obtained demonstrate that the developed technique can accurately and efficiently model the behaviour of cold-formed steel built-up sections. Furthermore, the influence of the fasteners properties, their longitudinal spacing and also the boundary conditions on the overall buckling behaviour of built-up sections is examined through numerical examples. The simplicity of the proposed technique facilitates an extensive parametric study of cold-formed built-up sections including the search for optimal placement of fasteners and combinations of component sections in built-up profiles.

show abstract

“…These instability phenomena and their influence on the ultimate strength at room temperature have been widely studied (Camotim et al, 2007 andSilvestre et al, 2010b). However, the behaviour of these cold-formed steel elements in fire has only recently started to receive more attention (Shahbazian et al, 2011;Arrais, 2012;Laim, 2013;Gunalan et al, 2015). In fact, the fire resistance evaluation of cold-formed profiles has a major role in the resistance of these elements.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on the Fire Resistance of Steel Columns With Cold-Formed Lipped Channel Sections

Arrais¹,

Lopes²,

Real³

2016

ASFE

View full text Add to dashboard Cite

Steel structural elements with cold-formed thin-walled sections are becoming increasingly common in buildings due to their lightness and ability to support large spans. In these members, local, distortional and global instabilities are important common failure modes. At high temperatures, these instability phenomena are intensified. This paper presents a numerical study on the behaviour of columns with cold-formed C-sections in case of fire when subjected to compression. A parametric study, considering different steel grades, temperatures and different cross-sections with different slendernesses, is presented. Comparisons are also made between the numerical results and analytical design rules, such as the EN1993-1-2, using its Annex E or its French National Annex, where a different constitutive law is recommended for cold-formed profiles. It is possible to conclude that the simple calculation rules are on the safe side but sometimes too conservative.

show abstract

Experimental and numerical analysis on the structural behaviour of cold-formed steel beams

Cited by 101 publications

References 16 publications

10.26: Parametric numerical analysis of cold‐formed steel Σ‐shaped beams under fire

10.26: Parametric numerical analysis of cold‐formed steel Σ‐shaped beams under fire

07.20: Application of the compound strip method in buckling analysis of cold‐formed steel built‐up sections

Parametric Study on the Fire Resistance of Steel Columns With Cold-Formed Lipped Channel Sections

Contact Info

Product

Resources

About