1. Dipartimento di Architettura Costruzione e Design, Polytechnic University of Bari, 70126 Bari, Italy
2. Division of Bridge, Metal and Timber Structures, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland
3. Division of Geotechnics and Strength of Materials, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland