1. Professor, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag, Auckland, New Zealand.
2. Postgraduate Student, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag, Auckland, New Zealand.
3. Associate Professor, Dept. of Civil and Environmental Engineering, The Univ. of Auckland, Private Bag, Auckland, New Zealand.
4. Associate Professor, Civil & Environmental Engineering Dept., Michigan Tech. University, Houghton, MI 49931.