1. Research Officer, National Research Council Canada, Institute for Research in Construction, M-59, Ottawa, ON K1A 0R6.
2. Professor, Dept. of Civil Engineering, Univ. of Toronto, Toronto, Canada, M5S 1A4.
3. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, Toronto, Canada, M5S 1A4.
4. Ph.D. Candidate, Dept. of Civil Engineering, Univ. of Western Ontario, London, Canada, N6A 5B9.