1. Assistant Professor, School of Engineering, Acadia Univ., Wolfville NS, Canada B4P 2R6.
2. Research Officer, Institute for Research in Construction, National Research Council of Canada, Ottawa ON, Canada K1A 0R6.
3. Professor, Dept. of Civil Engineering and Applied Mechanics, McGill Univ., 817 Sherbrooke W., Montreal PQ, Canada H3A 2K6.