PSI - Issue 47

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 47 (2023) 668–674

27th International Conference on Fracture and Structural Integrity (IGF27) Analytical study of a circular plate with thickness anomaly: critical 27th International Conference on Fracture and Structural Integrity (IGF27) Analytical study of a circular plate with thickness anomaly: critical

temperature fluctuation in the tunnel S.Aiello a *, V. De Biagia, P. Cornetti a , B. Chiaia a a Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin and 10129, Italy temperature fluctuation in the tunnel S.Aiello a *, V. De Biagia, P. Cornetti a , B. Chiaia a a Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin and 10129, Italy

© 2023 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 IGF27 chairpersons Abstract Several repeating themes have emerged in recent years, which are currently being investigated by the scientific community. The development of innovative, automated, and non-invasive techniques to assess structural problems is highlighted among these. The main reasons include the issues associated with ageing infrastructures reaching the end of life, as well as the challenges associated with the maintenance of structures designed without taking this critical factor into account. The structures considered at the base of this study are the Italian highway tunnels. They have shown in several monitoring campaigns the presence of anomalies of the lining thickness in several sections. This paper presents an analysis of the stress state of a concrete plate with a thickness anomaly subjected to a significant temperature fluctuation. The research permits to calculate the critical thickness as a function of temperature fluctuations and load conditions on these areas of the lining. This approach can enable a safer management of dangerous situations within the tunnel by using the parametric analysis of the measures database via artificial intelligence algorithms. © 2023 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 IGF27 chairpersons Abstract Several repeating themes have emerged in recent years, which are currently being investigated by the scientific community. The development of innovative, automated, and non-invasive techniques to assess structural problems is highlighted among these. The main reasons include the issues associated with ageing infrastructures reaching the end of life, as well as the challenges associated with the maintenance of structures designed without taking this critical factor into account. The structures considered at the base of this study are the Italian highway tunnels. They have shown in several monitoring campaigns the presence of anomalies of the lining thickness in several sections. This paper presents an analysis of the stress state of a concrete plate with a thickness anomaly subjected to a significant temperature fluctuation. The research permits to calculate the critical thickness as a function of temperature fluctuations and load conditions on these areas of the lining. This approach can enable a safer management of dangerous situations within the tunnel by using the parametric analysis of the measures database via artificial intelligence algorithms. © 2023 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 IGF27 chairpersons

Keywords: durability of concrete structures; tunnels; structural integrity; temperature effect; thickness anomalies Keywords: durability of concrete structures; tunnels; structural integrity; temperature effect; thickness anomalies

1. The background of the research and the italian context In recent years, the safety of infrastructure has become an increasingly important topic due to the potential disastrous consequences of accidents and the emotional impact on public opinion. Among the various types of 1. The background of the research and the italian context In recent years, the safety of infrastructure has become an increasingly important topic due to the potential disastrous consequences of accidents and the emotional impact on public opinion. Among the various types of

* Corresponding author. E-mail address: salvatore.aiello@polito.it * Corresponding author. E-mail address: salvatore.aiello@polito.it

2452-3216 © 2023 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 IGF27 chairpersons 2452-3216 © 2023 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 IGF27 chairpersons

2452-3216 © 2023 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 IGF27 chairpersons 10.1016/j.prostr.2023.07.054