Precast elements in the construction site. Analysis of the use of Composite Steel Trussed Concrete Beams (CSTCBs) in a building in Ciriè (TO).

The present work investigates the application of precast elements in modern construction, especially the use of Composite Steel Trussed Concrete Beams (CSTCBs) through an analysis in a real building project located in Ciriè (TO), Italy. CSTCBs represent a hybrid structural solution that combines the benefits of steel and concrete, offering profits both in the design stage by enhancing the structural capacity and in terms of construction efficiency and speed. The study begins with an overview of precast concrete elements, their historical evolution and their role in current construction industry. Focus is given then to CSTCBs, describing their phased structural behaviour: in Phase I the steel truss acts as a self-supporting system, while in Phase II, after the hardening of cast in situ concrete, the complete section carries the loads. A detailed structural analysis of the CSTCBs is presented, including design considerations, load conditions and adherence with National Codes and Eurocodes. In the real case study CSTCBs are implemented and put in comparison with traditional RC beams, highlighting differences in structural performance, construction speed and logistical impact. The last part of the work discusses on the practical implementation and suggests possible future developments for broader adoption in the building industry. The findings highlight the proven efficiency of CSTCBs in structural applications, especially in projects where factors like time, modularity and on-site safety play a crucial role.