1. Professor, Dept. of Civil Engineering, King Fahd Univ. of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
2. Research Engineer, Center for Engineering Research, Research Institute, King Fahd Univ. of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
3. Associate Professor, Dept. of Civil Engineering, King Fahd Univ. of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.