1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Private Bag 92019, Auckland 1010, New Zealand (corresponding author).
2. Professor, School of Civil, Environmental, and Mining Engineering, Univ. of Adelaide, SA 5005, Australia.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Private Bag 92019, Auckland 1010, New Zealand.