1. Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Hong Kong 999077, China.
2. Dept. of Architecture and Civil Engineering, City Univ. of Hong Kong, Kowloon, Hong Kong 999077, China.
3. Dept. of Architecture and Civil Engineering, City Univ. of Hong Kong, Kowloon, Hong Kong 999077, China; Shenzhen Research Institute of City Univ. of Hong Kong, Shenzhen, China (corresponding author).