1. Laboratoire MSSMat/CNRS-UMR 8579; École Centrale Paris; Grande voie des Vignes, 92295 Châtenay-Malabry Cedex France
2. Department of Civil Engineering and Engineering Mechanics; Columbia University; 630 SW Mudd, 500 West 120th Street, New York, NY 10027 U.S.A.
3. Department of Civil Engineering; École Polytechnique de Montréal; PO Box 6079, Station CV, Montreal, QC H3C 3A7 Canada
4. LMT-Cachan (ENS Cachan/CNRS/UPMC/PRES UniverSud Paris); 61 Avenue du Président Wilson, 94235 Cachan Cedex France