1. Graduate Research Fellow, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, B233 Newmark Civil Engineering Laboratory, 205 N. Mathews Ave., Urbana, IL 61801.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 1211 Newmark Civil Engineering Laboratory, 205 N. Mathews Ave., Urbana, IL 61801.