1. Assistant Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., 3546 Engineering Building, East Lansing, MI 48824-1226.
2. Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015.
3. Professor and Director of ATLSS Research Center, Dept. of Civil and Environmental Engineering, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015.
4. Bruce G. Johnston Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015.