1. Structural Engineering Department, Cairo University, Giza 12613, Egypt.
2. Urban and Environmental Research Unit (UEE), University of Liège, Building B52, Quartier Polytech 1, Allée de la Découverte 9, B-4000 Liège, Belgium.
3. Spurgin Leonhart, Route de Strasbourg BP 20151, 67603 Selestat Cedex, France.