1. Ph.D. Student, Dept. of Civil Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo ON, Canada N2L 3G1.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Carleton Univ., 1125 Colonel By Dr., Ottawa ON, Canada K1S 5B6.
3. Professor, Dept. of Civil Engineering, Univ. of British Columbia, 2324 Main Mall, Vancouver BC, Canada V6T 1Z4.