1. Associate Professor, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag 92019, Auckland, New Zealand (corresponding author).
2. Professor, Dept. of Engineering, Univ. of Aberdeen, Aberdeen AB24 3UE, U.K.
3. Professor, Dept. of Mechanical and Environmental Engineering, Univ. of California at Santa Barbara, Santa Barbara CA 93106.
4. Postgraduate Student, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag 92019, Auckland, New Zealand.
5. Professor, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag 92019, Auckland, New Zealand.