1. Research Associate, Dept. of Engineering, Univ. of Cambridge, Trumpington St., Cambridge, UK CB2 1PZ. E-mail: neil.hoult@gmail.com
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Carleton Univ., 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6. E-mail: Ted_Sherwood@carleton.ca
3. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON Canada M5S 1A4. E-mail: bentz@ecf.utoronto.ca
4. Univ. Professor and Bahen-Tanenbaum Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto ON, Canada M5S 1A4. E-mail: mpc@civ.utoronto.ca