1. School of Natural and Built Environments, Univ. of South Australia, Mawson Lakes Campus, GPO 2471, SA 5095, AU
2. School of Natural and Built Environments, Univ. of South Australia, Mawson Lakes Campus, GPO 2471, SA 5095, AU (Corresponding author), e-mail: Tom.benn@unisa.edu.au
3. School of Civil, Environmental and Chemical Engineering, RMIT Univ., GPO Box 2476V, Melbourne, VIC 3001, AU
4. School of Civil Engineering and Surveying, Univ. of Southern Queensland, Springfield Campus, PO BOX 4393, Raceview LPO, Raceview, QLD 4305, AU