1. Department of Civil Engineering, Chair of Bridge, Metal and Timber Structures, Faculty of Civil Engineering, Cracow University of Technology, Chair of Metal Structure L-3, Crakow, Poland
2. Department of Achitecture, Construction and Design, Polytechnic University of Bari, Bari, Italy
3. Department of Engineering, University of Campania "Luigi Vanvitelli", Aversa, Italy
4. Department of Civil Engineering, Cracow University of Technology, Cracow, Poland