1. Ph.D. Student and Faculty of Engineering, Dept. of Civil and Environmental Engineering, Univ. of Auckland, 20 Symonds St., Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand (corresponding author).
2. Senior Lecturer and Faculty of Engineering, Dept. of Civil and Environmental Engineering, Univ. of Auckland, 20 Symonds St., Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand.
3. Lecturer and Faculty of Engineering, Dept. of Engineering Science, Univ. of Auckland, 20 Symonds St., Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand.
4. Professor and Faculty of Engineering, Dept. of Civil and Environmental Engineering, Univ. of Auckland, 20 Symonds St., Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand.