1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221.
2. Professor, Dept. of Civil and Environmental Engineering, 304 Civil Engineering Building, Univ. of Alberta, Edmonton AB, Canada T6G 2G7.
3. Associate Professor, Del E. Webb School of Construction, Arizona State Univ., P.O. Box 0204, Tempe, AZ 85287.