1. Research Associate, Dept. of Civil Engineering, Univ. of Calgary, 2500 University Dr. N.W., Calgary, Alberta, Canada, T2N 1N4.
2. Assistant Professor, Dept. of Civil Engineering, Univ. of Calgary, 2500 University Dr. N.W., Calgary, Alberta, Canada, T2N 1N4 (corresponding author).
3. Research Associate, Civil and Offshore Engineering, Heriot Watt Univ., Edinburgh, UK, EH14 4AS.
4. Professor, Civil and Offshore Engineering, Heriot Watt Univ., Edinburgh, UK, EH14 4AS.