1. Lecturer, Civil Engineering Dept., Faculty of Engineering, The British Univ. in Egypt, Building A, Room 204, 11837, P.O. Box 43, Cairo, Egypt, e-mail: sherif.abdelsalam@bue.edu.eg
2. P. C. Rossin Assistant Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., 326 STEPs Building, 1 W. Packer Ave., Bethlehem, PA 18015, US e-mail: mts210@lehigh.edu
3. Wilson Engineering Professor and Associate Chair, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 376 Town Engineering Building, Ames, IA 50011-3232, US e-mail: sri@iastate.edu