1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1142, New Zealand (corresponding author).
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1142, New Zealand.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1142, New Zealand.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1142, New Zealand.