1. Graduate Student, Dept. of Civil Engineering, Univ. of Toronto, Toronto, ON M56 1A4, Canada; formerly, Graduate Student, Dept. of Civil Engineering, Queen’s Univ., Kingston, ON K7L 3N6, Canada.
2. Assistant Professor, Dept. of Civil Engineering, Queen’s Univ., Kingston, ON K7L 3N6, Canada.
3. Vice President of Research, Univ. of Guelph, Guelph, ON N1G 2W1, Canada.