1. Associate Professor, Civil Engineering Dept., Univ. of Cergy-Pontoise, 5, Mail Gay Lussac, Neuville sur Oise, F-95031 Cergy-Pontoise, France (corresponding author).
2. Associate Professor, LaSAGeC, Allée du Parc Montaury F-64 600, France.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alabama, Hunstville, AL.