PSI - Issue 84

Paolo Andrea Miglietta et al. / Procedia Structural Integrity 84 (2026) 1111–1118 P.A. Maglietta et al. / Structural Integrity Procedia 00 (2026) 000–000

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5. Conclusions In this study, the effect of degradation phenomena on the seismic behaviour of a reinforced concrete bridge pier was investigated, accounting also for the randomness associated with weather, material and construction parameters. Time-dependent bending moment-curvature and shear force-shear strain relationships were utilized to model both flexural and shear response of the case study pier as a function of degradation phenomena induced by corrosion and long-term response. Non-linear Push-over analysis was carried out to assess the evolution of the pier seismic performance over time. The results confirmed that both lateral load capacity and failure mode of the pier are strongly affected by reinforcement corrosion and concrete cracking. In addition, the inherent uncertainties of input parameters can substantially impact the rate of performance deterioration. Lastly, the randomness of the governing input parameters is crucial for accurately predicting structural performance over time in case of corrosion, enabling more effective planning of maintenance and retrofitting interventions. Acknowledgements Funded by the European Union NexGeneration EU Research project Sustainable Mobility Center (Centro Nazionale per la Mobilità Sostenibile – CNMS) – Code CN00000023, CUP: F83C22000720001, SPOKE 7, approved for funding under Italian National plan for recovery and resilience (PNRR), MISSION 4 COMPONENT 2, INVESTMENT 1.4. References Alonso Medina, P., León González, F.J., Todisco, L., 2022. Data-driven prediction of long-term deterioration of RC bridges. Constr. Build. Mater. 317. https://doi.org/10.1016/j.conbuildmat.2021.125790 Blasi, G., Civera, M., Miano, A., 2025. Combining multirisk regional assessment of civil infrastructures with material degradation. A brief review, in: COMPDYN 2025 - 10thECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Rhode Island, Grece, pp. 15–18. https://doi.org/10.7712/120125.12544.25460 CEB-FIP, 2010. fib Model Code for Concrete Structures. fib - fédération internationale du béton. Coronelli, D., Gambarova, P., 2004. Structural Assessment of Corroded Reinforced Concrete Beams: Modeling Guidelines. J. Struct. Eng. 130, 1214–1224. https://doi.org/10.1061/(asce)0733-9445(2004)130:8(1214) El Maaddawy, T., Soudki, K., 2007. A model for prediction of time from corrosion initiation to corrosion cracking. Cem. Concr. Compos. 29, 168–175. https://doi.org/10.1016/j.cemconcomp.2006.11.004 EN 1992-1-1, 2004. Eurocode 2 - Design of concrete structures - Part 1-1: General rules and rules for buildings. European Standard. Imperatore, S., Rinaldi, Z., Drago, C., 2017. Degradation relationships for the mechanical properties of corroded steel rebars. Constr. Build. Mater. 148, 219–230. https://doi.org/10.1016/j.conbuildmat.2017.04.209 Mander, J.B., Priestley, M.J., Park, R., 1988. Theoretical stress–strain model for confined concrete. J. Struct. Eng. 114, 1804–1826. McKenna, F., Fenves, G.L., Scott, M.H., Jeremir, B., 2000. Open system for earthquake engineering simulation, OpenSEES. University of Berkeley. Miglietta, P.A., Blasi, G., Perrone, D., Micelli, F., Aiello, M.A., 2025. Time-dependent structural response of reinforced concrete bridge piers considering degradation phenomena uncertainties, in: COMPDYN 2025 - 10thECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Rhode Island, Grece. https://doi.org/10.7712/120125.12541.24949 Pedeferri, P., Bertolini, L., 2000. La durabilità del calcestruzzo armato, McGraw-Hill Education. Sung, Y.C., Huang, C.H., Liu, K.Y., Wang, C.H., Su, C.K., Chang, K.C., 2010. Life-cycle evaluation of deteriorated structural performance of neutralised reinforced concrete bridges. Struct. Infrastruct. Eng. 6, 741–751. https://doi.org/10.1080/15732470802214930 Tuutti, K., 1982. Corrosion of steel in concrete. Swedish Cement and Concrete Research Institute, Stockholm. https://doi.org/10.1016/B978-0-08 102616-8.00005-8 Wang, L., 2023. Strand Corrosion in Prestressed Concrete Structures, Strand Corrosion in Prestressed Concrete Structures. Springer. https://doi.org/10.1007/978-981-99-2054-9