1. Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Block E1A, #07-03, 1 Engineering Dr. 2, Singapore 117576, Singapore (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, Singapore.