1. Assistant Professor, Dept. of Civil Engineering, Auburn Univ., Auburn, AL 36849.
2. Joseph T. Stuart Professor of Structural Engineering, and Director, Advanced Technology for Large Structural Systems (ATLSS) Center, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton AB, Canada T6G 2W2.