1. M.Sc., Ph.D. Candidate, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907, US, e-mail: kabdelwa@purdue.edu
2. ASCE Member, P.E., Ph.D., Full Professor, Dept. of Construction and Architectural Engineering, The American Univ. in Cairo, 113 Kasr El-Aini St., Cairo 11511, EG, e-mail: Safkhedr@aucegypt.edu