1. Assistant Professor, School of Civil and Transportation Engineering, South China Univ. of Technology, No. 381, Wushan Road, Tianhe District, Guangzhou 510641, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong (corresponding author).
3. Professor, College of Engineering, Mathematics and Physical Sciences, Univ. of Exeter, Exeter, U.K.
4. Lecturer, College of Engineering, Mathematics and Physical Sciences, Univ. of Exeter, Exeter, U.K.