PSI - Issue 62

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ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 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 62 (2024) 361–368

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Temporal reliability evolution of a prestressed girder with post tensioned tendons subjected to corrosion Simone Celati a,* , Agnese Natali a , Walter Salvatore a , Sebastian Thöns b a Department of Civil and Industrial Engineering, School of Engineering, University of Pisa, Largo Lucio Lazzarino 1, Pisa 56122, Italy b Division of Structural Engineering, Lund University, John Ericssons väg 1, Lund 22363, Sweden Abstract This paper presents a methodology for the assessment of time-dependent reliability of post-tensioned (PT) girders. As possible lack of consistent maintenance efforts and the constraints of economic and temporal resources become increasingly apparent, there is a need to comprehend their remaining service life, intricately tied to the gradual evolution of their reliability over time. In this study, the primary focus is directed towards a combination of extreme load failure mechanisms and tendon corrosion. The proposed methodology is applied to a scenario involving a simply supported prestressed girder with PT tendons. The analysis takes into account the progressive reduction in bending capacity over time due to the adverse effects of tendon corrosion. Diverging from conventional approaches found in existing literature, the time-to-corrosion model embeds not only the chloride concentration in voids present in the grout injection but also considers the thermodynamic conditions necessary for the development of corrosion. A sensitivity analysis of the input variables is performed to identify the most influential parameters over time. The study shows that considering both chloride concentration and thermodynamic conditions can lead to a more realistic residual structural life. It is concluded that the consideration of the thermodynamic conditions is essential to avoid overly conservative safety assessments, which could lead to a poorly optimized management and sustainability of bridges. © 2024 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 Scientific Board Members Keywords: Existing bridges; In-Time Reliability; Corrosion; Prestressed-concrete with post-tensioned tendons II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Temporal reliability evolution of a prestressed girder with post tensioned tendons subjected to corrosion Simone Celati a,* , Agnese Natali a , Walter Salvatore a , Sebastian Thöns b a Department of Civil and Industrial Engineering, School of Engineering, University of Pisa, Largo Lucio Lazzarino 1, Pisa 56122, Italy b Division of Structural Engineering, Lund University, John Ericssons väg 1, Lund 22363, Sweden Abstract This paper presents a methodology for the assessment of time-dependent reliability of post-tensioned (PT) girders. As possible lack of consistent maintenance efforts and the constraints of economic and temporal resources become increasingly apparent, there is a need to comprehend their remaining service life, intricately tied to the gradual evolution of their reliability over time. In this study, the primary focus is directed towards a combination of extreme load failure mechanisms and tendon corrosion. The proposed methodology is applied to a scenario involving a simply supported prestressed girder with PT tendons. The analysis takes into account the progressive reduction in bending capacity over time due to the adverse effects of tendon corrosion. Diverging from conventional approaches found in existing literature, the time-to-corrosion model embeds not only the chloride concentration in voids present in the grout injection but also considers the thermodynamic conditions necessary for the development of corrosion. A sensitivity analysis of the input variables is performed to identify the most influential parameters over time. The study shows that considering both chloride concentration and thermodynamic conditions can lead to a more realistic residual structural life. It is concluded that the consideration of the thermodynamic conditions is essential to avoid overly conservative safety assessments, which could lead to a poorly optimized management and sustainability of bridges. © 2024 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 Scientific Board Members Keywords: Existing bridges; In-Time Reliability; Corrosion; Prestressed-concrete with post-tensioned tendons © 2024 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 Scientific Board Members

* Corresponding author. Tel.: +39-050-221-8253. E-mail address: simone.celati@phd.unipi.it * Corresponding author. Tel.: +39-050-221-8253. E-mail address: simone.celati@phd.unipi.it

2452-3216 © 2024 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 Scientific Board Member s 2452-3216 © 2024 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 Scientific Board Member s

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