1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana–Champaign, 205 North Mathews Ave., Urbana, IL 61801 (corresponding author). E-mail: andrawes@uiuc.edu
2. Associate Professor, School of Civil and Environmental Engineering, Georgia Institute of Technology, GA 30332-0355. E-mail: reginald.desroches@ce.gatech.edu