1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong, China.
2. Assistant Professor, Dept. of Civil Engineering, Chu Hai College of Higher Education, Tuen Mun, N.T., Hong Kong, China (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong, China.