Stability of Tubular Steel Structures : Buckling and Lateral Torsional Buckling

Abstract : This subject becomes topical following a rapid evolution of design procedures for slender structures used widely in the temporary installations. Only through the last twenty years that these structures are prefabricated of multidirectional frames (steel or aluminium tubular sections). These structures are lightweight and their stability lies only in the internal stiffness at rows of posts and horizontally by the planking as well as the links with the building. This work concerns the study of instabilities (buckling - lateral torsional buckling) taking into account different types of imperfections. New buckling curves and the associated imperfection factors are proposed in this thesis. These curves are obtained by imposing an initial deformed representing the geometrical and mechanical defects (residual stress). The experimental results were confronted with theoretical predictions of Eurocode 3 which show that the values of the imperfections in the literature are extremely exaggerated. The values advocated in this work could be of interest for a possible adjustment of the European buckling curves for this type of structure. Regarding the lateral instability, an original methodology in real scale tests of trusses consist of tubular elements was also developed. The developed loading system of "free wheels" allows releasing the point of application of the force from the beginning of instability. This technique leads to more accurate measurements of the critical lateral torsional buckling moment.
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2016_0172_KHAMISI.pdf
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https://hal.univ-lorraine.fr/tel-01752405
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Submitted on : Thursday, March 29, 2018 - 1:45:13 PM
Last modification on : Wednesday, September 4, 2019 - 2:06:03 PM

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  • HAL Id : tel-01752405, version 1

Citation

Ali Khamisi. Stability of Tubular Steel Structures : Buckling and Lateral Torsional Buckling. Other. Université de Lorraine, 2016. English. ⟨NNT : 2016LORR0172⟩. ⟨tel-01752405⟩

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