1. Ph.D. Scholar, Dept. of Civil and Environmental Engineering, Univ. of Auckland, 20 Symonds St., Auckland 1142, New Zealand (corresponding author).
2. Senior Lecturer, Dept. of Built Environment Engineering, Auckland Univ. of Technology, AUT City Campus, Auckland 1142, New Zealand.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Auckland, 20 Symonds St., Auckland 1142, New Zealand.