1. Prof., Dept. of Civ. Engrg., King Fahd Univ. of Petr. and Minerals, Dhahran 31261, Saudi Arabia.
2. Asst. Prof., Dept. of Civ. Engrg., King Fahd Univ. of Petr. and Minerals, Dhahran 31261, Saudi Arabia.
3. Res. Engr. III, Res. Inst., King Fahd Univ. of Petr. and Minerals, Box 501, Dhahran 31261, Saudi Arabia.