1. M.Sc.E. Candidate, Dept. of Civil Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3.
2. Professor, Dept. of Civil Engineering, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3 (corresponding author).