1. Professor, Construction Engineering and Management Dept., King Fahd Univ. of Petroleum and Minerals, Dhahran, Saudi Arabia 31261.
2. Professor, Architectural Engineering Dept., King Fahd Univ. of Petroleum and Minerals, Dhahran, Saudi Arabia 31261 (corresponding author).
3. Research Assistant, Construction Engineering and Management Dept., King Fahd Univ. of Petroleum and Minerals, Dhahran, Saudi Arabia 31261.