1. Graduate Student, Dept. of Civil Engineering, Univ. of Manitoba, Winnipeg, Manitoba, R3T 5V6, Canada.
2. Assist. Professor, Dept. of Civil Engineering, Univ. of Manitoba, Winnipeg, Manitoba, R3T 5V6, Canada.
3. Distinguished Professor of Civil Engineering and Construction, CFL, North Carolina State Univ., Raleigh, NC 27695.