1. Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Block E1A, #07-03, 1 Engineering Dr. 2, Singapore 117576 (corresponding author). ORCID: .
2. Professor, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Block E1A, #07-03, 1 Engineering Dr. 2, Singapore 117576.
3. Professor, Dept. of Civil Engineering, Chung Yuan Christian Univ., Chung-Li 32023, Taiwan.