1. Assistant Professor, Dept. of Civil Engineering, Boise State Univ., 1910 Univ. Drive, Boise, ID 83725-2075 (corresponding author).
2. Postdoctoral Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.
3. Professor, Dept. of Civil Engineering, The Hong Kong Univ. of Science and Technology, Room 3569, Clear Water Bay, Kowloon, Hong Kong.
4. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.
5. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801.