PSI - Issue 84

ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

Procedia Structural Integrity 84 (2026) 1111–1118

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference Abstract As many European reinforced concrete bridges were built in the last century, construction materials aging results in a significant drop of their structural performances. Additionally, most of existing bridges meet outdated design standards, particularly in the case of Italian region. Such aspects evidence the need for substantial retrofit interventions. In fact, several studies have pointed out that structural behaviour is strongly affected by the deterioration and aging of building materials. Reinforcement corrosion is the most common and detrimental degradation phenomenon that may affect the structural performance of reinforced concrete facilities. Moreover, the corrosion process is deeply dependent on building details and weather parameters, which are affected by inherent uncertainties. Seismic performance of bridge structures mostly relies on stiffness and strength of the piers. Therefore, reduction of the confinement effect, flexural strength, shear strength and ductility related to stirrups and longitudinal rebars corrosion may lead to unacceptable safety levels under seismic action. Since deterioration processes are influenced by stochastic parameters, predictive analysis performed with a deterministic approach could lead to fallacious estimation of the structural safety level. To deal with this issue, the time-dependent evolution of the structural performance of a bridge component was investigated within a probabilistic framework. A number of degradation models, including reinforcement corrosion, concrete cracking and creep were employed to assess the time-dependent cross-sectional response of the bridge pier, while also considering the randomness involved in input parameters. The cross-sectional flexural and shear behaviour were represented through bending moment-curvature and shear force– shear strain relationships, respectively. These constitutive relationships were implemented in a numerical model of the pier to capture both flexural and shear responses. Non-linear Push-over analyses were performed to assess the influence of degradation phenomena on the seismic performance. Lastly, the seismic capacity in terms of dissipated energy was evaluated over time, considering the aleatory uncertainties related to the governing parameters. III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Time-dependent seismic response of reinforced concrete bridge piers considering degradation phenomena Paolo Andrea Miglietta a , Gianni Blasi a, *, Daniele Perrone a , Francesco Micelli a , Maria Antonietta Aiello a a Department of Engineering for Innovation, University of Salento, Lecce 73100, Italy Abstract As many European reinforced concrete bridges were built in the last century, construction materials aging results in a significant drop of their structural performances. Additionally, most of existing bridges meet outdated design standards, particularly in the case of Italian region. Such aspects evidence the need for substantial retrofit interventions. In fact, several studies have pointed out that structural behaviour is strongly affected by the deterioration and aging of building materials. Reinforcement corrosion is the most common and detrimental degradation phenomenon that may affect the structural performance of reinforced concrete facilities. Moreover, the corrosion process is deeply dependent on building details and weather parameters, which are affected by inherent uncertainties. Seismic performance of bridge structures mostly relies on stiffness and strength of the piers. Therefore, reduction of the confinement effect, flexural strength, shear strength and ductility related to stirrups and longitudinal rebars corrosion may lead to unacceptable safety levels under seismic action. Since deterioration processes are influenced by stochastic parameters, predictive analysis performed with a deterministic approach could lead to fallacious estimation of the structural safety level. To deal with this issue, the time-dependent evolution of the structural performance of a bridge component was investigated within a probabilistic framework. A number of degradation models, including reinforcement corrosion, concrete cracking and creep were employed to assess the time-dependent cross-sectional response of the bridge pier, while also considering the randomness involved in input parameters. The cross-sectional flexural and shear behaviour were represented through bending moment-curvature and shear force– shear strain relationships, respectively. These constitutive relationships were implemented in a numerical model of the pier to capture both flexural and shear responses. Non-linear Push-over analyses were performed to assess the influence of degradation phenomena on the seismic performance. Lastly, the seismic capacity in terms of dissipated energy was evaluated over time, considering the aleatory uncertainties related to the governing parameters. III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Time-dependent seismic response of reinforced concrete bridge piers considering degradation phenomena Paolo Andrea Miglietta a , Gianni Blasi a, *, Daniele Perrone a , Francesco Micelli a , Maria Antonietta Aiello a a Department of Engineering for Innovation, University of Salento, Lecce 73100, Italy

* Corresponding author. E-mail address: gianni.blasi@unisalento.it * Corresponding author. E-mail address: gianni.blasi@unisalento.it

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference 10.1016/j.prostr.2026.06.142 2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference 2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference