1. Ph.D. Candidate, Dept. of Civil Engineering, National Univ. of Singapore, #07-03, Block E1A, 1 Engineering Dr. 2, Singapore 117576, Singapore.
2. Associate Professor and Deputy Head, Dept. of Civil Engineering, National Univ. of Singapore, #07-03, Block E1A, 1 Engineering Dr. 2, Singapore 117576, Singapore (corresponding author).