1. Bridge Engineer, International Bridge Technologies, Inc., 9325 Sky Park Court, Suite 320, San Diego, CA 92123; formerly, Postdoctoral Fellow, Dept. of Civil Engineering, Univ. of Toronto, Toronto, Canada M5S 1A4 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, Toronto, Ontario, Canada M5S 1A4.