1. Staff II—Structures, Simpson Gumpertz and Heger, Inc., Waltham, MA; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo, ON, Canada N2L 3G1.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 Univ. Ave. West, Waterloo, ON, Canada N2L 3G1 (corresponding author).
3. Technical Director, Rowan Williams Davies and Irwin, Inc., Guelph, ON, Canada N1K 1B8.