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Influence des raidisseurs sur le comportement local d'assemblages de grandes dimensions dans les structures en acier

Abstract : The work presented in this thesis focuses on the behaviour of compressed stiffeners in steel connections with large dimensions. It is based on three main parts. The first part, based on experimental study, describes two test campaigns carried out at the platform MSGC (Institut Pascal, Polytech Clermont, Université Clermont Auvergne). The two test campaigns concern unstiffened and stiffened panels of different configurations. These panels represent the compressed part of a beam-to-column connection. In total, six configurations of stiffeners were tested: single sided and double sided, over the full height of the web panel and partial length, welded or not to the flanges. The purpose of these tests is to characterize the behaviour of each profile, stiffened or not, and to evaluate its resistance. The tests results allowed to observe the behaviour of each profile, stiffened or not, subjected to compression and to evaluate the influence of some geometrical parameters, such as the stiffener configuration and the profile slenderness, on the global resistance of the stiffened panels. The second part is devoted to the development of a non-linear finite element model built with the Cast3m software using DKT shell elements. This choice is justified by the simplicity of the model in coherence with the available hardware. The numerical model allowed to represent the real behaviour of the stiffened and unstiffened panels until the failure using a load with displacement control. This non-linear calculation takes into account geometric and material non-linearities. The validation of the numerical model is carried out by comparison with the experimental results. Indeed, this model confirmed the experimental observations concerning the behaviour of the fully and partially stiffened profiles. It is thus used to explain some experimental results and to carry out parametric studies to extend the observations to slender profiles. Also, to target engineering applications, the numerical model is used to evaluate analytical formulas given by Eurocode 3. In the third part, after the analysis of the behaviour of each configuration of stiffeners, a calculation approach of the ultimate load of stiffened profiles, based on the experimental and numerical observations, is proposed. A critical view is taken on the design formulas given by Eurocode for unstiffened and stiffened panels. The limits of the application intervals are discussed mainly for unstiffened panels. For the stiffened panels, the failure mode is controlled by the behaviour of the transverse stiffener.
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Submitted on : Monday, June 20, 2022 - 12:34:11 PM
Last modification on : Wednesday, June 22, 2022 - 3:06:30 AM


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Sabra Bougoffa. Influence des raidisseurs sur le comportement local d'assemblages de grandes dimensions dans les structures en acier. Génie civil. Université Clermont Auvergne; Université de Tunis El Manar, 2021. Français. ⟨NNT : 2021UCFAC094⟩. ⟨tel-03699581⟩



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