1. Chair Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
2. Lecturer in Civil Engineering, School of Science and Engineering, Univ. of Dundee, Fulton Bldg., Nethergate DD1 4HN, U.K. (corresponding author).
3. Former Research Student, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
4. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.