1. John Curtin Distinguished Professor, Dept. of Civil Engineering, Curtin Univ., GPO Box U1987, Bentley, WA 6845, Australia.
2. Lecturer, Faculty of Science Engineering and Built Environment, School of Architecture and Built Environment, Deakin Univ., 1 Gheringhap St., Geelong, VIC 3220, Australia (corresponding author).
3. Director, Frontline Coach Pty Ltd, 9 Ashmore Ave., Mordialloc, VIC 3195, Australia.