1. Ph.D. Candidate, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50011; formerly, Master of Engineering Student, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore.
2. Professor and Vice Dean, School of Civil and Environmental Engineering, Nanyang Technological Univ., Blk N1, #1A-02, Nanyang Ave., 639798, Singapore (corresponding author).
3. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Blk N1, #1C-80, Nanyang Ave., 639798, Singapore.