1. Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, Singapore 119260.
2. Research Engineer, Faculty of Civil Engineering and Geosciences, Delft Univ. of Technology, 2600 GA Delft, The Netherlands.
3. Structural Engineering Advisor, ExxonMobil Upstream Research Company, Houston, TX 77002.
4. Research Scholar, Dept. of Civil Engineering, National Univ. of Singapore, Singapore 119260.