The work was carried out as part of research project No. N506 158440 financed by the Ministry of Science and Higher Education.
Reviewer: prof. dr hab. inż. Michał Knauff
Translation: dr inż. Anna Kosińska
Preparing of text: mgr inż. Jacek Filipczak
Department of Concrete
Structures Lodz University
of Technology, Poland
Łódź 2013