1. Research Fellow, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576, Singapore (corresponding author).
2. Engineer, AECOM Singapore Pte. Ltd., 300 Beach Rd., #03-00 The Concourse, Singapore 199555; formerly, Undergraduate Student, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576, Singapore.
3. Professor, Dept. of Civil and Environmental Engineering, National Univ. of Singapore, Singapore 117576, Singapore.