1. Assoc. Prof., Dept. of Civ. Engrg., Jordan Univ. of Sci. and Technol., P.O. Box 3030, Irbid, Jordan.
2. Prof. and Chair, Dept. of Civ. Engrg., Lakehead Univ., Thunder Bay, Ontario, Canada P7B 5E1.
3. Grad. Student, Dept. of Civ. Engrg., Jordan Univ. of Sci. and Technol., P.O. Box 3030, Irbid, Jordan.