1. 1GUT, Gdansk University of Technology, Faculty of Civil and Environmental Engineering, St.Gabriela Narutowicza 11/12,Gdansk, Poland
2. 2Gdansk University of Technology, Faculty of Civil and Environmental Engineering, St. Gabriela Narutowicza 11/12, 80-233Gdansk, Poland
3. 3Wroclaw University of Science and Technology, Faculty of Civil Engineering, St. Wybrzeże Wyspiańskiego 27, 50-370Wrocław, Poland