1. University of Cagliari; DICAAR - Dept. of Civil and Environmental Engineering and Architecture; 2, via Marengo I-09123 Cagliari Italy
2. University of Naples Federico II; DIST - Dept. of Structures for Engineering and Architecture; 21, via Claudio I-80125 Naples Italy
3. Technische Universität Dresden, Institut Statik und Dynamik der Tragwerke; Schumann-Straße 10 D-01062 Dresden Germany