Slender Thin‐walled Box Columns Subjected to Compression and Bending

Pavlovčič, Luka; Froschmeier, Bernadette; Kuhlmann, Ulrike; Beg, Darko

doi:10.3846/jcem.2010.19

Cited by 10 publications

(6 citation statements)

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“…Mode interaction has also been observed in physical experiments on hollow section columns [45,46,47,48,49,50]. However, these particular investigations have principally focused on the ultimate load capacity and the behaviour in the inelastic range.…”

Section: Introductionmentioning

confidence: 91%

Length effects on interactive buckling in thin-walled rectangular hollow section struts

Shen

Wadee

2018

Thin-Walled Structures

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A variational model formulated using analytical techniques describing the nonlinear coupling between local and global buckling modes within an elastic thin-walled rectangular hollow section strut is presented. A system of nonlinear differential and integral equations subject to boundary conditions is derived and solved using numerical continuation techniques. The nonlinear behaviour of four representative lengths is investigated, which are characterized by the post-buckling equilibrium paths. The numerical results from the variational model are validated using a nonlinear finite element model and largely show excellent comparisons, particularly for the practically important ultimate load and the initial post-buckling behaviour. Boundaries for the four distinct length-dependent zones are identified and the most unstable zone is demonstrated to have a considerably narrower length range than previously determined for practical corner boundary conditions within the cross-section

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Section: Introductionmentioning

confidence: 91%

Length effects on interactive buckling in thin-walled rectangular hollow section struts

Shen

Wadee

2018

Thin-Walled Structures

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“…Experimental studies confirmed these observations [ 12 , 13 ]. Since, depending on the load conditions, thin-walled structures susceptible to instability of global buckling as well as to localized deformation [ 14 , 15 , 16 , 17 ]. It is especially crucial for a structure like a console, in which the stress is localized around joining/assembled zone.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Innovative Channel Strut Concept Manufactured by Roll-Forming

et al. 2022

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Due to the wide use of channel strut components, manufacturing is implemented in many industrial plants. Standard technology of profiles is based on welding of two parts of the profile and requires the regalvanizing of the joint zone causes. Thus, the production is challenging to automate on a single line. The main idea of the article is to present a concept of a channel strut, a cold-formed continuous metal component with an open or closed profile section. It would serve as a cantilever support instead of a standard solution. In the article, a unique lock system combination is proposed and analyzed both numerically and experimentally to provide steadiness of the strut without welding or other joining techniques. Two main lock shapes—semicircular and triangle—were proposed with some variations in the cutting plane. Analyses were carried out for three main profile cross-sections with different dimensions, based on the current industrial applications. The semicircular type of the lock was found to be the most stable, giving optimal strength to the strut under assumed loading, comparable to traditional solutions. The commercial FEM software MSC Marc was used for the numerical analysis.

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“…Moreover, optimized thin-walled members are generally susceptible to triggering different buckling modes simultaneously [4] and exhibit highly nonlinear behaviour with failure modes being associated with a severe degree of sensitivity to imperfections [5,6,7,8,9,10]. Moreover, owing to their excellent ductility, most steel thinwalled members in structural engineering are designed such that their ultimate state lies in the elasto-plastic range [11], which has also been observed in many experimental studies [12,13,14,15,16,17]. The coupling of material nonlinearity and buckling mode interaction has been shown to increase the imperfection sensitivity further [18,19].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to local imperfections in inelastic thin-walled rectangular hollow section struts

Shen

Wadee

2019

Structures

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Mass efficient inelastic thin-walled rectangular hollow section (RHS) struts practically always fail in a combination of local-global interactive buckling and material nonlinearity while also exhibiting high sensitivity to initial imperfections. Nonlinear finite element (FE) models for inelastic thin-walled RHS struts with pre-defined local and global geometric imperfections are developed within the commercial package Abaqus. Using a unified local imperfection measurement based on equal local bending energy, the effects of imperfect cross-section profiles, imperfection wavelength and the degree of localization in the longitudinal direction on the ultimate load and the nonlinear equilibrium path are investigated for four characteristic length struts at different material yielding stress levels. The corresponding most severe imperfection profiles are determined and are found to be qualitatively different to the linear eigenmodes in all cases. Moreover, it is found that the most severe purely periodic imperfections may be used to provide a safe approximation of the ultimate load when the corresponding amplitude is constrained to the manufacturing tolerance level. An extensive parametric study on the wavelength of the most severe periodic imperfection profile is conducted and a relationship for this is proposed in terms of the normalized local slenderness, which compares excellently with the FE results.

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Slender Thin‐walled Box Columns Subjected to Compression and Bending

Cited by 10 publications

References 1 publication

Length effects on interactive buckling in thin-walled rectangular hollow section struts

Length effects on interactive buckling in thin-walled rectangular hollow section struts

Analysis of the Innovative Channel Strut Concept Manufactured by Roll-Forming

Sensitivity to local imperfections in inelastic thin-walled rectangular hollow section struts

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