1. Research Scholar, Dept. of Civil Engineering, The National Univ. of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
2. Professor, Dept. of Civil Engineering, The National Univ. of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
3. Associate Professor, Dept. of Civil Engineering, The National Univ. of Singapore, 10 Kent Ridge Crescent, Singapore 119260.