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Analyse multi-échelle des connexions par collage : application aux éléments structuraux multimatériaux fléchis

Abstract : This PhD thesis investigates the connection of steel-flexural members by bonding and focuseson static and instantaneous behavior. First, experimental and numerical analyses are performed. A push out test is used : two concrete blocks are connected to steel members. The influence of the concrete blocks and bonding joint geometry is examined. Cohesive shear failure appears in concrete near the interface. Failure can occur when the average shear strain is twice the tension limit of concrete, which can be explained by favorable slipping between the concrete block and the support. In this case, the bonding joint is not only solicited in shear but also in compression. Results depend on the length of bonding joint and concrete blocks geometry. So, push out test cannot be now used to characterize the bonding connection between steel and concrete in order to design structures. The second is about the analysis of the behavior of steel concrete composite beams. A precast beam with compressive concrete was tested. Results show that a bonding connection can be an alternativesolution regardless of the slab manufacturing. We develop two numerical models. The first one is based on multi-layer beam modeling and the second one is a nonlinear 3D finite element model. The stress distribution close to the interface and near failure is more accurate with the finite element model than with the generalized model. Bonding joint geometry and plastification of steel girder have an influence on the failure region in the concrete.
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Submitted on : Friday, April 11, 2014 - 10:07:09 AM
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  • HAL Id : tel-00977408, version 1

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Charlotte Meaud. Analyse multi-échelle des connexions par collage : application aux éléments structuraux multimatériaux fléchis. Autre. Université Claude Bernard - Lyon I, 2012. Français. ⟨NNT : 2012LYO10163⟩. ⟨tel-00977408⟩

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