1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139-4307, United States
2. Laboratoire de Mécanique et Génie Civil, CNRS-Université de Montpellier, 34090Montpellier, France
3. Epidapo, the joint CNRS/ George Washington University laboratory, IRL2006, Children’s National Medical Center, Children’s Research Institute, 111 Michigan Ave. NW, Washington, District of Columbia20010, United States