1. Assoc. Prof., Constr. and Build. Engrg. Dept., Coll. of Engrg. and Technol., Arab Acad. for Sci. and Technol. and Maritime Transport, P.O. Box 1029 Miami, Alexandria, Egypt. E-mail: mohemam@aast.edu
2. Prof. and Head, Constr. Engrg. Dept., Facu. of Engrg., Zagazig Univ., Zagazig, Egypt.