1. Members, ASCE
2. Asst. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Alberta, Edmonton, AB, Canada T6G 2G7. E-mail: dzhu@civil.ualberta.ca
3. Prof., Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver, BC, Canada V6T 1Z4. E-mail: lawrence@civil.ubc.ca