1. Graduate Research Assistant, Dept. of Civil, Architectural and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409.
2. Professor, Dept. of Civil, Architectural and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409 (corresponding author).
3. Ph.D. Student, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Kowloon, Hong Kong.