Analysis of the post-buckling behavior of a purlin built from thin-walled cold-formed C profile

Pięciorak, Edyta; Piekarczyk, Marek

doi:10.1016/j.tws.2007.08.036

Cited by 2 publications

(2 citation statements)

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“…Eqs. (17)- (19) indicate that, for the beam with no lateral restraint the lateral vibration and torsional vibration modes are independent, whereas for the beam with lateral restraint applied at the upper flange the lateral vibration and torsional vibration modes are combined together to form a single mode. As a numerical example, Fig.2 shows a comparison of the frequencies of a channel-section beam with and without lateral restraint, which also reflects the influence of the lateral restrain on the vibration behaviour of the beam.…”

Section: Resultsmentioning

confidence: 99%

“…Existing research work on CFS purlins and rails showed that the sheeting, which is supported by the CFS members, has a significant influence on the distribution of pre-buckling stresses [8][9][10][11], the web crippling [12], the buckling behaviour [13][14][15][16][17][18], and the post-buckling behaviour [14,[19][20][21] of the members. Although the importance of dynamic response to machinery loading and to extreme environmental loads such as wind and earthquakes has been recognised for some time, the current design for the CFS members is still dominated by the static load.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic instability of channel-section beams under periodic loading

Zhu

Qian

2018

Mechanics of Advanced Materials and Structures

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This paper presents an analytical investigation on the free vibration, static buckling and dynamic instability of channel-section beams when subjected to periodic loading. The analysis is carried out by using Bolotin's method. By assuming the instability modes, the kinetic energy and strain energy of the beam and the loss of the potential of the applied load are evaluated, from which the mass, stiffness and geometric stiffness matrices of the system are derived. These matrices are then used to carry out the analyses of free vibration, static buckling and dynamic instability of the beams. Theoretical formulae are derived for the free vibration frequency, critical buckling moment, and excitation frequency of the beam. The effects of the lateral restraint applied to the flange, the section size of the beam and the static part of the applied load on the variation of dynamic instability zones are also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic instability of channel-section beams under periodic loading

Zhu

Qian

2018

Mechanics of Advanced Materials and Structures

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Strength and buckling of cold-formed steel laterally unbraced stiffened C and Z sections

Yerudkar¹,

Vesmawala²

2018

Proceedings of the Institution of Civil Engineers - Structures

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The ultimate strength and buckling behaviour of cold-formed steel (CFS) laterally unbraced stiffened C and Z section members in bending and torsion were investigated. Bending tests were conducted on CFS beams with five different stiffener combinations (web, flange or a combination of web and flange intermediate stiffeners). The experimental and numerical results showed a reduction in displacement and an increase in bending strength after the provision of intermediate stiffeners along the web and flange of the channel members while there was an increase in both buckling loads and displacement in the Z sections. Flexural and lateral torsional buckling was predominant in simple end stiffened and single web stiffened sections, while sections with combined web and flange stiffeners failed due to combined distortional, flexural and lateral torsional buckling. The experimental results were simulated using finite-element software and they showed good agreement with the experimental results in terms of displacement, bending strength and buckling modes. CFS members can be plain in simple applications, but if provided with flange or web intermediate stiffeners, their performance and resistance to buckling improves. The idea behind this study was to use CFS members with a modified shape rather than thickness to carry extra load. Due to the relatively easy manufacturing method, a large number of different configurations can be produced to fit the demands of optimised designs for both structural and economic purposes.

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Analysis of the post-buckling behavior of a purlin built from thin-walled cold-formed C profile

Cited by 2 publications

References 0 publications

Dynamic instability of channel-section beams under periodic loading

Dynamic instability of channel-section beams under periodic loading

Strength and buckling of cold-formed steel laterally unbraced stiffened C and Z sections

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