PhD thesis: "Multiscale approach for the mechanical behavior of reinforced concrete structures - Application to the containment of nuclear power plants"
Martin David will defend his PhD thesis on the topic "Multiscale approach for the mechanical behavior of reinforced concrete structures - Application to the containment of nuclear power plants" Tuesday, June 19 from 10am at the Ecole Polytechnique, amphitheater Becquerel (Grand Hall).
Abstract :
This thesis develops a multi-scale strategy to describe the mechanical behaviour of steel reinforcements and prestressing tendons in a reinforced concrete structure. This strategy is declined in several steps, which allow gradual integration of new physical phenomena. The first asymptotic model represents the effective elastic behaviour of heterogeneities periodically distributed on a surface. It combines an elastic interface behaviour and a membrane behaviour. A second asymptotic model then focuses on the behaviour of rigid fibers distributed on a surface, which may slide with respect to the surrounding volume. These models induce less stress concentrations than the usual truss models. They are implemented in the finite element code Code_Aster, and validated with respect to reference three-dimensional simulations. Their interaction with a macroscopic crack is studied. Finally, this strategy allows the modeling of experimental tests carried out on a portion of a containment building in real scale.
Keywords :
asymptotic analysis, scale separation, steel-concrete connection, nuclear containment