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Tipologia Anno Titolo Titolo inglese Autore File
Lauree magistrali 2024 Sustainability-driven risk analysis of reinforced concrete structures Topic : Sustainability-driven risk analysis of reinforced concrete structures The construction sector a critical driver in EU that impacts the environment due to 30% of total energy consumption, considering operational and embodied energy. The thesis focuses on developing a unified framework for evaluating the target reliability of reinforced concrete structures. Traditionally, target reliability has been derived by optimization of cost and safety ignoring the environmental toll. But achieving sustainability in civil infrastructure requires more than just minimizing material usage, it demands a careful trade-off between durability, safety margins, and environmental consequences across a structure’s life cycle. To address this, Fischer et al.’s (2019) monetary optimization model is expanded by introducing environmental costs and two new key variables the environmental class, reflecting the environmental cost relative to the construction cost, and the relative environmental cost, capturing the effect of reliability adjustments on environmental performance. This led to the development of a refined optimization equation that includes fixed and variable environmental costs also incorporating key inputs such as the age-averaged societal discount rate (γ), obsolescence rate (ω), consequence classes (CC1–CC3), and central safety factors (p). Probabilistic methods are employed to compute failure probabilities (Pf (p)), considering lognormal distributions for resistance and action variables (VR,VS). The Malkia Bridge in Finland served as a case study to validate the model. From the LCA of the bridge, dead loads are calculated based on material volumes and live load distribution using Courbon’s Method. Dead load and live load moments are analyzed using Staad.Pro and resistance moment is calculated using Eurocode 4 as the structure is a concrete-steel composite and used in the framework. MUKUNDAN, MEENU
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