RIUSO DI PANNELLI IN ACCIAIO FORMATO A FREDDO PER LA RIQUALIFICAZIONE INTEGRATA DI EDIFICI ESISTENTI E PER NUOVE COSTRUZIONI

Sustainability has become an imperative in the development of all sectors of the economy, includ-ing construction. In recent years, integrated retrofit systems have been proposed to improve both seismic and energy performance. In this context, the effectiveness of cold-formed steel panels as a structural layer is currently being investigated. This study investigates the possible reuse of com-ponents of an integrated cold-formed steel retrofit system for the construction of a new building with innovative steel-CLT hybrid floors. Based on the analysis of an existing post-war reinforced concrete building with masonry infill walls, the structural layer of the integrated retrofit was de-signed to reduce seismic vulnerability through steel panels with burring holes. At the end of the retrofitted building's useful life, the entire steel system was considered for disassembly and reuse in a new hybrid steel and timber building. To demonstrate the validity of the approach, a life cycle analysis was carried out showing the avoided environmental impacts related to material and pro-duction processes. The results confirm that the reuse of structural components of the steel retrofit systems is a sustainable and efficient solution for new constructions and reduces the associated en-vironmental impact.