1. Professor, Dept. of Civil Engineering and Director, Counseling and Advising Center, King Fahd Univ. of Petroleum and Minerals, KFUPM Postal Box 5028, Dhahran 31261, Saudi Arabia (corresponding author).
2. Research Engineer II, Center for Petroleum and Minerals, Research Institute, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.