1. Assistant Professor, Dept. of Mechanics, Structures and Environment, Univ. of Cassino, via G. Di Biasio, 43, 0343—Cassino (FR), Italy (corresponding author).
2. Associate Professor, Dept. of Mechanics, Structures and Environment, Univ. of Cassino, via G. Di Biasio, 43, 0343—Cassino (FR), Italy
3. Professor, Dept. of Mechanics, Structures and Environment, Univ. of Cassino, via G. Di Biasio, 43, 0343—Cassino (FR), Italy