1. Engineer in Training, BMR Structural Engineering, 5413 Doyle St., Halifax, NS, Canada B3J 1H9 (corresponding author).
2. Honorary Research Associate, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3.
3. Associate Professor, Prince Mohammad Bin Fahd Univ., P.O. Box 1664, Al Khobar, Kingdom of Saudi Arabia 31952.
4. Professor, Univ. of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada E3B 5A3.