1. Formerly, Post Graduate Student, School of Civil and Environmental Engineering, Nanyang Technological Univ., 639798 Singapore.
2. Associate Professor and Vice Dean, School of Civil and Environmental Engineering, Nanyang Technological Univ., Block N1, 1A-02, Nanyang Ave., 639798 Singapore (corresponding author).
3. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Block N1, 1C-80, Nanyang Ave., 639798 Singapore.