1. Ph.D. Student, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8014, New Zealand (corresponding author).
2. Senior Lecturer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8014, New Zealand.
3. Professor, Dept. of Structural and Geotechnical Engineering, Univ. of Rome ‘La Sapienza’, Rome 00185, Italy; Professor, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8014, New Zealand.
4. Associate Professor, Dept. of Civil Engineering, Queen’s Univ., Kingston, ON, Canada K7L 3N6.