Nicolas Richart

Biography

I graduated as an engineer in computer science in 2005 at the Ecole National Superieur en Electronique Informatique et Radiocomunication de Bordeaux (ENSEIRB). My degree is colored by an option od High Performance Computing (HPC). Then I made my thesis at LaBRI/INRIA Bordeaux in the ScalApplix/HiePACS team, on the in-situ steering of coupled parallel numerical simulations. I graduated as a Ph D. of computer science of the Universite de Bordeaux 1 in 2010. Since then I am working at EPFL in the Laboratoire de Simulations en Mechanique des Solides (LSMS) as a scientific collaborator.

Official source

https://people.epfl.ch/nicolas.richart

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Hybrid asynchronous SEM/FEM co-simulation for seismic nonlinear analysis of concrete gravity dams

Michael Ludovic Brun, Nicolas Richart

The aim of this work is to take full advantage of Spectral Element (SE) and Finite Element (FE) codes by setting up a SEM/FEM co-simulation strategy for soil structure interaction problems, involving a SE code to generate and propagate elastic waves in the soil, while a FE code enables the detailed representation of the studied structure. The spatial coupling is managed by the standard coupling mortar approach, whereas the time integration is dealt with an hybrid (explicit/implicit) asynchronous (different time steps) time integrator. The SEM/FEM co-simulation strategy is set up for linear or nonlinear transient dynamics. A seismic analysis of a concrete dam is considered in order to demonstrate the versatility of the co-simulation approach, assuming a linear rheology or a nonlinear damaging behaviour of the concrete. (C) 2020 Elsevier Ltd. All rights reserved.

PERGAMON-ELSEVIER SCIENCE LTD2021

Correction to: Numerical evaluation of test setups for determining the shear strength of masonry (vol 51, 110, 2018)

Katrin Beyer, Nicolas Richart, Shenghan Zhang

2019

Numerical evaluation of test setups for determining the shear strength of masonry

Katrin Beyer, Nicolas Richart, Shenghan Zhang

The bond shear strength between masonry units and mortar is the weakest link in a masonry wall. Different material tests have been developed in order to characterize this bond behaviour. The objective of this study is to evaluate three common test setups through non-linear finite element analysis. The simulation method is based on our recent development of cohesive elements, which allows for the first time to fully capture the force-deformation characteristic of shear tests in 3D from the onset of loading until the residual shear strength and to retrieve typical shear failure modes observed in experiments. This study provides new insights into our understanding and interpretation of such shear tests: (1) elastic analysis, which has been widely used in the past, does not yield a stress distribution that is representative of the stress distribution at maximum resistance; (2) while friction coefficient is well estimated (the error is less than 10%), the local cohesion is underestimated by all three test setups of which the error lies between 13 and 32%; (3) the randomness of the material properties leads to a further underestimation of the mean value of the local cohesion; (4) differences in the material properties of the two joints of the triplet test units do not jeopardize the applicability of this test setup and estimations of the mean properties are obtained with similar reliability as for couplet tests.

2018