1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Newmark Civil Engineering Laboratory 3147, 205 North Mathews Ave., Urbana, IL 61801 (corresponding author). E-mail: telgham2@uiuv.edu
2. Professor of Civil Engineering, Dept. of Civil Engineering, Yokohama National Univ., 79-5 Tokiwadai, Hodogaya-Ku, Yokohama 240-8501, Japan. E-mail: tomo@uiuc.ac.jp