1. Assistant Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong SAR 999077, China (corresponding author).
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Perugia, 06125 Perugia, Italy.
3. Associate Professor, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Christchurch 4800, New Zealand.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Perugia, 06125 Perugia, Italy.
5. Chair Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Hong Kong SAR 999077, China.