1. Ph.D. Student, Dept. of Civil Engineering, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
2. Professor, Dept. of Civil Engineering, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
3. Associate Professor, Dept. of Civil Engineering, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.