1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, The Kong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.
2. Associate Professor, Dept. of Civil and Environmental Engineering, The Kong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong (corresponding author).
3. Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.