1. Assistant Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798, Singapore (corresponding author).
2. Research Student, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798, Singapore.
3. Research Fellow, School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore 639798, Singapore.