1. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ. and A&M College, 3418H Patrick F. Taylor Hall, Nicholson Extension, Baton Rouge, LA 70803 (corresponding author).
2. Associate Professor, Dept. of INGEO, Universita’ degli Studi “G. D’Annunzio” Chieti-Pescara, Viale Pindaro 42, 65127 Pescara, Italy.