1. Professor of Structural Engineering and Managing Director, Dept. of Civil Engineering, Center of Excellence for Concrete Research and Testing, College of Engineering, King Saud Univ., P.O. Box 800, Riyadh 11421, Saudi Arabia (corresponding author).
2. Associate Professor, Center of Excellence for Concrete Research and Testing, College of Engineering, King Saud Univ., P.O. Box 800, Riyadh 11421, Saudi Arabia.
3. Professor of Structural Engineering, Dept. of Civil Engineering, College of Engineering, King Saud Univ., P.O. Box 800, Riyadh 11421, Saudi Arabia.