1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1010, New Zealand (corresponding author).
2. Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1010, New Zealand.
3. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1010, New Zealand.