1. Lecturer, School of Civil Engineering and Mechanics, Huazhong Univ. of Science and Technology, Wuhan, Hubei 430074, China; formerly, Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576.
2. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576 (corresponding author).
3. Adjunct Professor, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576.
4. Professor, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576.
5. Former Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576.