1. Member, ASCE,
2. Asst. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Western Ontario, London, ON, Canada N6A 5B9; corresponding author. E-mail: jshang@uwo.ca
3. Engineer-in-Training, SNC Lavalin Inc., 2235 Sheppard Ave. East, Willowdale, ON, Canada M2J 5A6.
4. Asst. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Western Ontario, London, ON, Canada N6A 5B9.