1. Professor of Civil Engineering, Faculty of Engineering, Univ. of Wollongong, NSW 2522, Australia (corresponding author). E-mail: indra@uow.edu.au
2. Ph.D. Candidate, Faculty of Engineering, Univ. of Wollongong, NSW 2522, Australia.
3. Lecturer, Faculty of Engineering, Univ. of Wollongong, NSW 2522, Australia.
4. Senior Principal, CHEMSTAB Consulting Pty Ltd., Horsley, NSW 2530, Australia.