1. Department of Construction Engineering and Utilities, Faculty of Engineering, Zagazig University, PO Box 44519, Zagazig, Egypt
2. Department of Civil Engineering, North Dakota State University, Dept. 2470, PO Box 6050, Fargo, ND 58105
3. Department of Building, Civil, and Environmental Engineering, Concordia University, 1515 Sainte-Catherine St W., Montréal, Québec, Canada, H3G 2W1