1. Associate Professor, Dept. of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos Univ., P.O. Box 33, P.C. 123 Muscat, Oman (corresponding author).
2. Structural Engineer, Muscat Municipality, P.O. Box 79, P.C. 100 Muscat, Oman.
3. Assistant Professor, Civil Engineering Dept., College of Engineering, Univ. of Buarimi, P.O. Box 890, P.C. 512 Buraimi, Oman.