1. Structural Designer, Associated Engineering (Ont.) Ltd., 110A Hannover Dr., St. Catharines, ON, Canada L2W 1A4.
2. Project Scientist, Rowan Williams Davies & Irwin, Inc., 600 Southgate Dr., Guelph, ON, Canada N1G 4P6.
3. Professor, Dept. of Civil Engineering, McMaster Univ., 1280 Main St. West, Hamilton, ON, Canada L8S 4L7 (corresponding author).