1. Research Engineer, Dept. of Civil, Surveying, and Environmental Engineering, Univ. of Newcastle, NSW 2308 Australia.
2. Research Fellow, Dept. of Civil, Surveying, and Environmental Engineering, Univ. of Newcastle, NSW 2308 Australia.
3. Professor, Dept. of Civil, Surveying, and Environmental Engineering, Univ. of Newcastle, NSW 2308 Australia.
4. Professor, Dept. of Civil Engineering, Univ. of Nottingham, U.K.