1. Associate Professor, Dept. of Civil Engineering, Faculty of Engineering at Rabigh, King Abdulaziz Univ., Rabigh, Kingdom of Saudi Arabia 21911; Associate Professor, Dept. of Civil Engineering, Faculty of Engineering, Aswan Univ., Aswan, Egypt (corresponding author).
2. Professor, Dept. of Urban and Civil Engineering, Ibaraki Univ., Hitachi 103-0014, Japan.