1. Ph.D. Student, Dept. of Building and Construction, City Univ. of Hong Kong, Hong Kong, China.
2. Ph.D. Student, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610065, China.
3. Associate Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Hong Kong, China (corresponding author).
4. Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610065, China.