1. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic Univ., 11 Yuk Choi Rd., Hung Hom, Hong Kong, China.
2. Ph.D. Student, Dept. of Infrastructure Engineering, The Univ. of Melbourne, Parkville, VIC 3010, Australia.
3. Professor, Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic Univ., 11 Yuk Choi Rd., Hung Hom, Hong Kong, China (corresponding author).