1. Assistant Professor, Dept. of Structural Analysis and Design, Faculty of Engineering, Univ. of Naples “Federico II,” P.le Tecchio 80, 80125 Napoli, Italy.
2. Engineer, Dept. of Structural Analysis and Design, Faculty of Engineering, Univ. of Naples “Federico II,” P.le Tecchio 80, 80125 Napoli, Italy.
3. Professor, Dept. of Constructions and Mathematical Methods in Architecture, Faculty of Architecture, Univ. of Naples “Federico II,” Via Monteoliveto, 80134 Napoli, Italy (corresponding author).