HYGRO-MECHANICAL MODELLING OF SELF INDUCED STRESSES: THE CASE OF VERCORS GUSSET

Abstract : The prediction of the concrete structure durability is closely linked to the prediction of cracking in the long-term. Initially saturated cementitious materials are the seat of water movement that are responsible for mechanisms such as drying shrinkage, creep or changes in mechanical properties. For instance, the differential drying between the surface and the core of the structure leads to a heterogeneous state of stresses and can induce significant micro cracking at the surface. Those micro-cracks will impact not only the mechanical properties but also the permeability of the structure [1]. In this study, a sequential analysis is proposed to represent the drying evolution and the corresponding cracking pattern. First, calculations are performed to model the drying process and to obtain relative shrinkage strains. These strains are, in a second step, applied in order to obtain the initial deflection and the cracking pattern. Then, the dried specimens can be subjected to various numerical tests in order to analyse the impact of drying effects on concrete mechanical properties even water permeability tests. The influence of shrinkage on cracking pattern due to the mechanical loading can also be investigated. A second part of this study is an application of the proposed modelling strategy to the first lift of the VeRCoRs containment wall mock up [2] (the gusset) in attempt to predict concrete cracking.
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Submitted on : Wednesday, June 12, 2019 - 8:48:57 AM
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François Soleilhet, Farid Benboudjema, Xavier Jourdain, Fabrice Gatuingt. HYGRO-MECHANICAL MODELLING OF SELF INDUCED STRESSES: THE CASE OF VERCORS GUSSET. CONMOD 2018 International symposium on Concrete modelling, 2018, Delft, Netherlands. ⟨hal-02153141⟩

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