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Evelyne Foerster

Evelyne Foerster
French Atomic Energy and Alternative Energies Commission/Paris-Saclay Centre · Systems and Structures Modelling Department

PhD/MSc. Eng.

About

50
Publications
17,204
Reads
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634
Citations
Additional affiliations
November 2010 - December 2013
French Geological Survey
Position
  • Deputy Head
Description
  • Coordination of R&D Activities Senior expert in Natural Risks

Publications

Publications (50)
Article
This paper presents the application of a coupling strategy between the Spectral (SEM) and Finite Element (FEM) Methods to solve the soil-structure interaction (SSI) problem. The SEM-FEM coupling benefits from the mesh refinement capabilities of the FEM in modeling the structure and the near soil, with the realism of the SEM for regional scale earth...
Article
This paper was aimed at highlighting the impact of loading waveforms on the cyclic liquefaction resistance of sand. The test specimens were reclaimed by the dry tamping method with Hostun 31 sand, and the density of sand matrix was controlled to be 0.70. Three sets of undrained cyclic triaxial tests were performed by altering the loading waveforms...
Article
Alternative and non-alternative loadings A B S T R A C T This study was aimed at highlighting the effect of loading frequency on the sand liquefaction response by performing cyclic triaxial tests in both stress-controlled and strain-controlled modes. For the first case, dense (I Dmat = 0.70) and medium-dense (I Dmat = 0.55) sand specimens were subj...
Book
Full-text available
This Cahier Technique has been produced under the aegis of the French Association for Earthquake Engineering (AFPS). It is an 'Earthquake Geotechnics' handbook providing an overview of the topic of earthquake-induced soil liquefaction. It follows on from Cahier Technique CT no. 22 describing the application of the PS92 rules (AFPS, 2001) and the Gu...
Article
When performing cyclic triaxial tests, the connection process between loading piston and specimen could have significant effect on the test results. Tensile pre-shearing effect occurs during saturation and consolidation stages in screw-based configurations and compressive pre-shearing stress is induced while making the connection between loading pi...
Article
Dry and moist tamping methods are widely used for the investigation of sandy soil liquefaction. However, the effect of these two tamping-based reconstitution methods on composite soil liquefaction behavior have been rarely assessed. In this study, the dry and moist tamping methods were assessed using loose silica sand matrix (HN31) containing vario...
Code
SEM3D (Ver 2017.04 Registered at French Agency for Protection of Programs (Dépôt APP), 2017) is Spectral Element Method code to solve elasto-acoustics wave propagation problems. It is jointly developed by MSSMat Laboratory of CentraleSupélec, CNRS, CEA and Insitut de Physique du Globe de Paris. SEM3D is capable of simulating broad-band non-linear s...
Article
Full-text available
Phase-field models are frequently adopted to simulate fracture mechanics problems in the context of the finite element method. To depict fracture, this method involves solving a coupled set of Helmholtz-like damage-field equation and augmented linear momentum balance equation. Solutions to these coupled equations are then used as descriptions of cr...
Book
Ce Cahier Technique a été réalisé sous l'égide de l’Association Française de Génie Parasismique (AFPS). Il s’agit d’un cahier de "Géotechnique Sismique" qui propose un panorama sur le thème de la liquéfaction des sols sous l'effet de séismes. Il s'inscrit dans la continuité du Cahier Technique CT n°22 qui détaille l’application des règles PS92 (AFP...
Article
This study aims to investigate the undrained shear strength of sand with added materials at different mean diameter ratios D50/d50 (D50 and d50 respectively represent the mean diameter of host sand and added materials) in loose state by performing a series of undrained triaxial tests. For this purpose, a very low density index of sand matrix IDmat...
Conference Paper
After the occurrence of the earthquake in Alaska and Niigata Japan in 1964, the liquefaction of clean sand has been extensively studied. Generally, natural sand consists of fines particles and several well-documented earthquakes showed that, similar to clean sand, soils containing low-percentage non-plastic fines were equally sensitive to liquefact...
Article
This paper highlights the effect of non-plastic fines on sand matrix by performing a series of undrained triaxial tests. The silty sand specimens were reclaimed by moist tamping method and two distinct density indexes of sand matrix were selected: IDmat=0.00 (<0.15) for very loose state and IDmat=0.50 (>0.40) for medium-dense state. The addition of...
Article
Full-text available
The 7th EU Framework programme project Advanced Safety Assessment Methodologies: “Extended PSA” (ASAMPSA_E, 2013–2016) was aimed at promoting good practices to extend the scope of existing Probabilistic Safety Assessments (PSAs) and the application of such “extended PSA” in decision-making in the European context. This project led to a collection o...
Article
Full-text available
This article presents the main results of the validation phase of the PRENOLIN project. PRENOLIN is an international benchmark on 1D nonlinear (NL) site‐response analysis. This project involved 19 teams with 23 different codes tested. It was divided into two phases; with the first phase verifying the numerical solution of these codes on idealized s...
Conference Paper
Full-text available
In the framework of the PRENOLIN international benchmark, aiming at testing multiple numerical simulation codes capable of predicting non-linear seismic site response with various constitutive models, the validation phase has consisted in comparing the predictions of numerical estimations with actual strong motion recordings obtained at well-known...
Article
Full-text available
PREdiction of NOn-LINear soil behavior (PRENOLIN) is an international benchmark aiming to test multiple numerical simulation codes that are capable of predicting nonlinear seismic site response with various constitutive models. One of the objectives of this project is the assessment of the uncertainties associated with nonlinear simulation of 1D si...
Conference Paper
Full-text available
The E2VP-1 international benchmark (« EUROSEISTEST Verification and Validation Project », 2005-2008) aimed at (i) evaluating accuracy of the numerical methods for seismic simulations of realistic 2D/3D basin models, and (ii) quantitatively comparing the recorded and numerically simulated earthquake ground motions. In this framework, the EUROSEISTES...
Article
Full-text available
Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties through ambient excitation measurements of structures. However, it is difficult to obtain an accurate estimation of damping ratio directly from time-frequency decomposition of ambient vibration measurements using CWT. The main objectiv...
Conference Paper
Full-text available
The aim of the present study is to identify realistic and damaging scenarios of seismic and tsunami events on Nice city and to provide data relative to the resulting physical damages to the built environment, as well as to the network systems. We tried to reduce the gap between realistic scientific modeling, risk evaluation and mitigation. Regardin...
Article
Full-text available
The assessment of historical elements at risk from earthquake loading presents a 10 number of differences from the seismic evaluation of modern structures, for design or retrofitting 11 purposes, which is covered by existing building codes, and for the development of fragility curves, 12 procedures for which have been extensively developed in the p...
Article
Full-text available
The methodologies available for the analytical quantification of the vulnerability of buildings which are subject to actions resulting from slope instabilities and landslides are relatively limited in comparison with other components of quantitative landslide risk assessment. This paper provides a general methodology for calculating the vulnerabili...
Article
Full-text available
During the past earthquakes, different low ductile failure modes are observed in the gravity design structures and thus, the most of existing damage indices may fail to assess the damage of gravity design structures accurately in referring to the two main performance levels: immediate occupancy and ultimate limit state. Therefore, this study invest...
Conference Paper
Full-text available
Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties such as natural frequencies, damping ratios and mode shapes through ambient excitation measurements of structures. This paper mainly discusses the capability of CWT method to identify the modal properties accurately using a numerical a...
Article
Full-text available
The safety study of a CO2 storage site requires the evaluation of the sustainable injection pressure. The faults are generally considered as one of the potential leakage paths as a fault zone could be more permeable than the neighbouring rock matrix. The pressure build up in the reservoir due to the injection procedure changes the stress field with...
Conference Paper
Full-text available
RÉSUMÉ. L'objectif de cette étude est de réaliser des simulations réalistes de séismes à grande échelle et haute fréquence (environ 5 Hz) dans la région de Pointe-à-Pitre, Guadeloupe. Pour cela, une modélisation détaillée de la source sismique et de la structure de vitesse du milieu est nécessaire. La géologie locale a été construite via le logicie...
Article
Full-text available
Large-scale landslide prediction is typically based on numerical modeling, with computer codes generally involving a large number of input parameters. Addressing the influence of each of them on the final result and providing a ranking procedure may be useful for risk management purposes. This can be performed by a variance-based global sensitivity...
Conference Paper
Full-text available
In order to assess the physical vulnerability of buildings, the general methodology consists in deriving fragility curves, representing the probabilities of exceeding some predefined structural damage states as a function of a parameter representing the hazard levels (e.g. PGA). In general, these curves do not account for soil-structure interaction...
Article
Full-text available
Vulnerability has long been a key concept in disaster literature. However, the majority of studies have focused on research related to the hazard, therefore neglecting the influence of the vulnerability of exposed systems to the consequences of such hazards, such as the death toll and losses from natural or man-made disasters. There is also a need...
Conference Paper
The goal of this study is to perform realistic large-scale spectral-element simulations in the vicinity of Pointe-à-Pitre, valid up to rather high frequencies (around 5 Hz) with a minimal shear-wave velocity around 200 m/s and considering magnitude 5 to 6 earthquakes. For this purpose, a detailed modeling of both the seismic source and geology of t...
Article
Full-text available
The aim of this paper is to propose a simplified methodology to evaluate the mechanical performances of buildings exposed to landslide hazard, by using procedures inspired from the seismic risk analysis, such as the Capacity Spectrum Method (ATC 40, 1996). Landslide hazard involves so many aspects, that quantitative vulnerability assessment require...
Article
We present finite-element numerical simulations of seismic wave propagation in non linear inelastic geological media. We demonstrate the feasibility of large-scale modeling based on an implicit numerical scheme and a nonlinear constitutive model. We illustrate our methodology with an application to regional scale modeling in the French Riviera, whi...
Article
Full-text available
The present study provides a set of numerical tools for modeling the geomechanical aspects related to the safety of geological CO2 storage, namely, caprock damage and fault reactivitation due to reservoir pressure rise. Large scale finite element models are used to describe the injection process. The change of the effective stress field is investig...
Article
The following values have no corresponding Zotero field: VL - WP 1: State-of-the art on vulnerability types ID - 110
Article
Full-text available
This paper presents a finite strain meshfree numerical approach, in order to simulate the water film or void-redistribution effect, which may be involved in shallow earthquake-triggered landslides and more specifically in post-earthquake lateral spreading when liquefaction occurs. The increase of pore water pressure, due to the water migration duri...
Article
Full-text available
This paper presents two numerical case studies of medium and strong motion events, namely Loma-Prieta 1989 and Hyogoken-Nambu (Kobe) 1995. These simulations were performed using CyberQuake model. The cyclic elastoplastic constitutive model is fully detailed in the companion paper. Through these case studies, we demonstrate the importance of using a...
Conference Paper
Full-text available
When dealing with large-scale three-dimensional (3D) simulations of natural hazards, such as earthquakes and landslides, computations often exceed the capacity of current single-processor computers and conventional serial computing strategies are no longer possible then. One is to use parallel strategies instead, with multiple processing and memory...
Conference Paper
Full-text available
Computational aspects and especially mass matrix determination, play a key part in soil dynamics applications. In seismic response analyses of soils, one option is to perform finite-element transient analyses on one-dimensional multi-layered profiles assuming various initial and boundary conditions. Diagonal mass matrices are generally preferred wi...
Article
The destructive 1999 Chi–Chi earthquake (Mw 7.5) was the largest inland earthquake in Taiwan in the 20th century. Several observations witness the non-linear seismic soil response in sediments during the earthquake. In fact, large settlements as well as evidence of liquefaction attested by sand boils and unusual wet ground surface were observed at...
Article
Full-text available
Observations during strong earthquakes (Mexico 1985, Kobe 1995, Algiers 2003, etc.) have shown that losses are generally concentrated near surficial soft soil deposits. Since such deposits are quite common under large built-up areas, there is an urgent need to assess the possible impact of soft soils on seismic ground motion. Under seismic loading,...
Article
Full-text available
This work first presents a synthesis of the main available Galerkin-type meshfree methods (DEM, EFGM, h-p Clouds, SPH, RKPM, RKI, MLS/RK, PIM, RPIM, MLS/RBF, etc.), providing a unified formalism for all methods and thus enhancing at once specific features for building shape functions. Several techniques dedicated to the numerical implementation of...
Conference Paper
Full-text available
A nonlinear Lagrangian saturated dynamic model for deformable porous media at finite strains is presented. The effective stress concept is used for the constitutive modeling. This model integrates constitutive relationships in the context of either hypoelasticity, using an incremental strain-stress relationship and objective rates, or hyperelastici...
Technical Report
Full-text available
Le concept de stockage en milieux naturels profonds repose sur les notions de barrières successives (colis, ouvragées, géologiques) qui doivent assurer les fonctions de protection, de rétention et de confinement. Parmi les nombreux éléments de cette problématique complexe se pose le problème des diverses perturbations et de leurs impacts à long ter...
Conference Paper
Full-text available
It is now commonly admitted that when encountering soft soils, the seismic ground motion is largely affected. To study such aspects a computer-aided design tool called CyberQuake, in which the behaviour of soils is introduced by a cyclic elastoplastic model, has been recently developed. It is a user-friendly program written in an object-oriented la...
Article
Using the Newmark scheme and the finite element technique respectively for the time and space discretizations, we obtain conditions for stability of implicit/explicit schemes and non-dispersion conditions with respect to time. The conditions are investigated in the case of a two-phase poro-elastodynamic medium for the mostly-used u-p formulation. S...
Article
Full-text available
Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties such as natural frequencies, damping ratios and mode shapes through ambient excitation measurements of structures. This paper mainly discusses the capability of CWT method to identify the modal properties accurately using a practical a...

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Projects

Projects (10)
Project
SIGMA-2 is a Research and Developpement project about seismic hazard and ground motion. It has the objective to improve data and develop methods necessary to develop reliable PSHA results with hazard levels more adapted to the site. It is funded by a consortium of companies and organizations involved in the nuclear energy sector: EDF, CEA, PG&E, swissnuclear, CEZ, Orano & CRIEPI.