1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Kowloon, Hong Kong, China (corresponding author).
2. Chair Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Kowloon, Hong Kong, China.
3. Associate Professor, School of Engineering and Information Technology, Univ. of New South Wales at Canberra, Canberra, ACT 2617, Australia.