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Analyse numérique du comportement d'assemblages métalliques. Approche numérique et validation expérimentale

Abstract : The research presented in this thesis deals with the behaviour of steel bolted endplate connections. The first part, with experimental character, describes two series of tests on endplate connections realized at the Laboratoire de Mécanique et Ingénierie (LaMI), Blaise Pascal University (Clermont-Ferrand). These two series concern connections of beam-to-colum or beam-to-beam types. Thus, eight specimens of connections, with various geometrical configurations, were tested to estimate the resistance, the rigidity and the rotation capacity. The studied parameters are the dimensional characteristics of the endplate (flush or extended) and its reinforcement. The results obtained allowed the characterization of the nonlinear behavior of bolted steel connections with endplates and the analysis of the contribution of some components on the global rotation of the connection. The second part is dedicated to the development of a non linear three-dimensional numerical model using finite element software CAST3M. The model allows following the real behavior of the endplate connection up to failure. It takes into account the material and geometrical non linearity (contact, plasticity, large displacements). To validate the numerical model, its results are compared with those from the experiment. So, to keep a practical aspect to the developed model, its results are confronted with the analytical formulations of Eurocode 3. The model allowed the analysis of the evolution of the stresses and the plasticity in various zones of the connection. It confirmed the experimental observations concerning the influence of the endplate stiffener on the mechanism of transfer of loads through its extremity. A parametric study is done to analyze the influence of the position of the endplate stiffener and the column stiffness on the global behavior of the connection. In the third part, the influence of the bolt bending on the behavior of the T-stubs, which represent the tension zone of the connection, is analyzed using a 3D finite elements model. As for the model of the connections, the model developed for the T-stubs takes into account the material and the geometrical non linearity. A parametrical study is done to estimate the effects of parameters such as the dimension of the T-stub, the rigidity of the washer, the position of the bolt and the thickness of the flange on the behavior of the T-stub and in particular the bending of the bolt. A particular look is carried on the influence of the bending moment on the behavior of the bolt, usually considered loaded only in tension.
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Submitted on : Friday, August 24, 2012 - 1:33:39 PM
Last modification on : Wednesday, May 11, 2016 - 1:19:49 PM
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  • HAL Id : tel-00725229, version 1


Anis Abidelah. Analyse numérique du comportement d'assemblages métalliques. Approche numérique et validation expérimentale. Génie mécanique [physics.class-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2009. Français. ⟨NNT : 2009CLF21965⟩. ⟨tel-00725229⟩



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