1. Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Melbourne, Parkville, VIC 3052, Australia. E-mail: t.ngo@civenv.unimelb.edu.au
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Melbourne, Parkville, VIC 3052, Australia (corresponding author). E-mail: p.mendis@civenv.unimelb.edu.au
3. Professor, Dept. of Civil and Coastal Engineering, Univ. of Florida, Gainesville, FL32611-6580; formerly, Protective Technology Center, Penn State Univ., University Park, PA 16802. E-mail: tedk@ufl.edu