1. Research Scholar, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore. E-mail: p149378223@ntu.edu.sg
2. Assistant Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore (corresponding author). E-mail: cywyang@ntu.edu.sg
3. Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore. E-mail: csohck@ntu.edu.sg