1. Senior Engineer, Thornton Tomasetti, Inc., 330 N. Wabash Ave., Suite 1500, Chicago, IL 60611 (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, 3108 Newmark Lab, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801.