1. Research Fellow, School of Civil Engineering & the Environment, Univ. of Southampton, Highfield, Southampton, U.K. E-mail: mjr@soton.ac.uk
2. Senior Lecturer, School of Civil Engineering & the Environment, Univ. of Southampton, Highfield, Southampton, U.K. E-mail: djr@soton.ac.uk
3. Professor, School of Civil & Resource Engineering, The Univ. of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia. E-mail: lehane@civil.uwa.edu.au