1. Asst. Prof., Constr. Engrg. Dept., Zagazig Univ., Zagazig, Egypt.
2. Chair, Dept. of Civ. and Envir. Engrg., P.O. Box 162450, Univ. of Central Florida, Orlando, FL 32816.
3. Assoc. Prof., Dept. of Civ. and Envir. Engrg., P.O. Box 162450, Univ. of Central Florida, Orlando, FL.