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Expérimentation et modélisation du comportement mécanique de structures multi-matériaux bois-béton

Abstract : The objective of this project is to develop composite structures. These kinds of structures are made with wood, concrete, adhesive and rebar. The purpose is to take advantages of each material in order to improve the mechanical behavior of the hybrid structure. New bonding systems are proposed and studied to offer innovating solutions in Civil Engineering.The first part is dedicated to the study of the liaison between wood and concrete by gluing. An experimental analysis is done with push out tests in order to determine the best configurations to connect wood and concrete. Two constructive methods have been retained: a dry way and a humid way.The second step consists to test these methods of fabrication in real condition. An experimental campaign on beams and panels is launched with 4 points bending tests and under static loading to characterize the mechanical behavior of eleven beams. The interest of such hybrid sections is confirmed: gain of the bearing capacity and rigidity. The gluing and the new system of bonding are both performing and avoid slip between materials. Tests on panels show a security margin compared to classic loads in construction, for both limit states.The last stage of the thesis focuses on the study of cyclic loading of hybrid panels where 4 points bending test is used to load panels for one million cycles between 4 and 20 kN. These loads correspond respectively to the dead load on the unloaded panels and the panels loaded with regulatory live loads. After cyclic tests are performed, a bending test to the rupture is conducted.In parallel, an analytical study to model the instantaneous mechanical behavior of composite structure is proposed. This model is based on an iterative calculation by studying the deformation of the section and by equilibrating internal forces. The mechanical behavior of each material is takes into account with their non-linearity. This modelling is developed for static loads and was adapted to take in consideration creep of materials and thus obtain the differential behavior of wood-concrete structures
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https://tel.archives-ouvertes.fr/tel-02002157
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Submitted on : Thursday, January 31, 2019 - 3:10:29 PM
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  • HAL Id : tel-02002157, version 1

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Eric Augeard. Expérimentation et modélisation du comportement mécanique de structures multi-matériaux bois-béton. Génie civil. Université de Lyon, 2018. Français. ⟨NNT : 2018LYSE1167⟩. ⟨tel-02002157⟩

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