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Modélisation tridimensionnelle d'assemblages de structure bois en tôle pliée mince par la méthode des élements finis

Abstract : The assembly of various elements of timber structures of standard dimensions such as timber beams or composite beams is often achieved by nailed steel connectors. These folded steel elements obtained by cold forming can be launched on the European market once an ETA is delivered regarding the recommendations of the ETAG 015. Up to now, the development and the characterisation of the strength of these connectors have been done within the company: CULLEN Building Products by lengthy and costly experimental tests. As an alternative to this procedure, this work presents an approach which enables modelling the behaviour of these connections by the finite element method. In the first place the influence of the type of steel used and the forming process on the strength of these hangers was studied. It is shown that it is not necessary to take into account the hardening produced by the forming of the steel so that the modelling can be achieved from the final geometry by shell elements. Secondly a simplified model of the behaviour of the nails is proposed. The parameters necessary for its implementation are identified. The model is then used to simulate the behaviour of the connection of a steel plate to timber by a single nail. These results are then confronted with the experimental results. As the model is necessarily 3 dimensional, a 3D non linear model is proposed for the timber by considering it as a structure. This structure is composed of cubes of crushable foam which are associated with elasto-plastic beams to give this structure its highly orthotropic behaviour. This structural model of wood is implemented to model the shear of timber bars, transversal compression where beams are supported, embedment tests of steel dowels and a traditional bird's mouth assembly. These various models show the capacities of this structural model to describe timber's complex behaviours; they also define the limits of this modelling. In the last section, the hanger, the nails and the timber are assembled in order to constitute the models for three characteristic and complex hangers of CULLEN's production. The results obtained are confronted with the experimental results. Finally, the models are used to explain the internal behaviour of these hangers at various loads up to their failure
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https://hal.univ-lorraine.fr/tel-01746279
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  • HAL Id : tel-01746279, version 1

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Imane Tavakoli-Gheynani. Modélisation tridimensionnelle d'assemblages de structure bois en tôle pliée mince par la méthode des élements finis. Sciences de l'ingénieur [physics]. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10135⟩. ⟨tel-01746279⟩

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