GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 Sustainable retrofits on reinforced concrete infrastructures V. Borghese 1 , C. P. Contiguglia 1 , D. Lavorato 1 , S. Santini 1 , B. Briseghella 2 , C. Nuti 1 1 Roma Tre University, Department of Architecture, Roma, Italy 2 Fuzhou University, College of Civil Engineering, Fuzhou, Fujian, China Introduction Sustainability is a major criterion for assessing new construction projects, and it is a topic that the infrastructure sector is investing a growing attention on. Maintenance plays a crucial role, especially as a result of tragic events that have shown how quick local responses can save both the lives of those who utilize the infrastructure and the infrastructure itself. Concrete has long been regarded as a timeless material that is incredibly dependable and long-lasting. However, maintenance and monitoring are necessary for any kind of structure and material. Whenever it is too late to act prior to collapse, it is imperative to further explore the idea of structural sustainability. When intervening earlier is impossible, the interventions that will be made need to be carefully considered. As for the idea of risk, it is clear that the assessment of the sustainability of interventions on RC infrastructures involves many different parameters mainly frequently combined into the three macro-categories of environmental, economic, and social benefits. Additionally, it is crucial to develop these three areas when combined with structural factors, with the forward-looking objective of resilience and the specific framework of the intervention to be performed. Their choice depends on the objective to be reached, which can change according to the object under consideration, the human factor (decision-maker, group of decision-makers, client, legislative authority...), the boundary conditions, which have an influence on certain choices. This research aims at evaluating some alternatives of intervention on a single bridge column that are useful to restore the moment resistant capacity at the base equal to the original. To achieve this result, four hypotheses are proposed and, after the project design, a multi-criteria sustainability analysis has been carried out to evaluate the intervention defined more sustainable. Case study: column bridge rehabilitation The Brabau bridge is located in Italy, and it is one kilometer beam bridge. The bridge pier is composed by two supporting columns and a cap beam forming a frame (Fig. 1).