1. Postgraduate Student, Dept. of Civil and Architectural Engineering, Sultan Qaboos Univ., P.O. Box 33, Al-Khod 123, Sultanate of Oman (corresponding author).
2. Associate Professor, Dept. of Civil and Architectural Engineering, Sultan Qaboos Univ., P.O. Box 33, Al-Khod 123, Sultanate of Oman.