1. Structural Designer, Flad Architects, 644 Science Dr., Madison, WI 53711.
2. Wilson Engineering Professor and Associate Chair, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 376 Town Engineering, Ames, IA 50011-3232 (corresponding author).
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., STEPs Building, Room 326, 1 West Packer Ave., Bethlehem, PA 18015.