PSI - Issue 62

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

Procedia Structural Integrity 62 (2024) 1043–1050

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) An interpretation of the new guidelines multilevel approach for a railway bridge Anna Rosa Tilocca a , Andrea Incerti a, *, Luca Pozza b , Claudio Mazzotti b and Marco Savoia b a CIRI Buildings and Construction (CIRI-EC), University of Bologna, Via del Lazzaretto 15/5, 40131, Bologna, Italy b Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Viale Risorgimento 2, 40136, Bologna, Italy Abstract In the last years for European governments, like in Italy, has become important to increase the attention on the maintenance plan activities and its assessment, analyzing their infrastructures as highway bridges or viaducts and focusing in particular on their structural elements as prestressed precast beams, piles, supports and slabs; This concern due to the fact that the percentage of failures and partial collapses are strictly connected with the age of the infrastructure, timing exposure and deterioration status. With this end, the Italian government has decided to apply a new procedure analysis, based on a multilevel approach composed by five different levels, directly connected between them in order to obtain an attention class index, starting to the project parameters knowledge until the monitoring phase characterized by using accelerometers or similar instruments, cabled directly on the bridges for real time recording. Moreover, in particular for the development of the level nr.2 that must describe the infrastructure status presently, an abacus with a large number of principal defects was developed for the common materials constituents like masonry, concrete, steel and wood to estimate the deterioration levels of each infrastructure elements. The objective of that work is the application of Italian guidelines on a railway bridge, in order to increase the knowledge on this kind of bridges and analyze if and how the multilevel approach allows to understand critical aspects of railway typologies structures or if particular suggestions are necessary. © 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 1. Introduction In the last years in many countries such as in Italy the governments pin up the attention on their national infrastructures and their status, following the collapse or failure of some of these. In this context, the serviceability and safety of infrastructures, like bridges, are of primary importance for granted high life quality level of peoples and communities, especially in emergency travelling scenarios (Pregnolato,2019). Considering also that a major number of bridges were designed and subsequently realized in Italy between 1930 and 1980, parameters like timing exposure and aggressive environmental conditions, strictly connected to the age of the infrastructure, but also the traffic volume increasing can change and trigger significant variation in the deterioration status and trend (Santasiero et al., 2021). For treat in a best manner this scenario, a maintenance plan activity and its assessment are II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) An interpretation of the new guidelines multilevel approach for a railway bridge Anna Rosa Tilocca a , Andrea Incerti a, *, Luca Pozza b , Claudio Mazzotti b and Marco Savoia b a CIRI Buildings and Construction (CIRI-EC), University of Bologna, Via del Lazzaretto 15/5, 40131, Bologna, Italy b Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Viale Risorgimento 2, 40136, Bologna, Italy Abstract In the last years for European governments, like in Italy, has become important to increase the attention on the maintenance plan activities and its assessment, analyzing their infrastructures as highway bridges or viaducts and focusing in particular on their structural elements as prestressed precast beams, piles, supports and slabs; This concern due to the fact that the percentage of failures and partial collapses are strictly connected with the age of the infrastructure, timing exposure and deterioration status. With this end, the Italian government has decided to apply a new procedure analysis, based on a multilevel approach composed by five different levels, directly connected between them in order to obtain an attention class index, starting to the project parameters knowledge until the monitoring phase characterized by using accelerometers or similar instruments, cabled directly on the bridges for real time recording. Moreover, in particular for the development of the level nr.2 that must describe the infrastructure status presently, an abacus with a large number of principal defects was developed for the common materials constituents like masonry, concrete, steel and wood to estimate the deterioration levels of each infrastructure elements. The objective of that work is the application of Italian guidelines on a railway bridge, in order to increase the knowledge on this kind of bridges and analyze if and how the multilevel approach allows to understand critical aspects of railway typologies structures or if particular suggestions are necessary. © 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: Multilevel approach; railway bridge; attention class index; degradation levels; structural defects. 1. Introduction In the last years in many countries such as in Italy the governments pin up the attention on their national infrastructures and their status, following the collapse or failure of some of these. In this context, the serviceability and safety of infrastructures, like bridges, are of primary importance for granted high life quality level of peoples and communities, especially in emergency travelling scenarios (Pregnolato,2019). Considering also that a major number of bridges were designed and subsequently realized in Italy between 1930 and 1980, parameters like timing exposure and aggressive environmental conditions, strictly connected to the age of the infrastructure, but also the traffic volume increasing can change and trigger significant variation in the deterioration status and trend (Santasiero et al., 2021). For treat in a best manner this scenario, a maintenance plan activity and its assessment are © 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) Keywords: Multilevel approach; railway bridge; attention class index; degradation levels; structural defects.

* Corresponding author. E-mail address: a.incerti@unibo.it * Corresponding author. E-mail address: a.incerti@unibo.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 Members 10.1016/j.prostr.2024.09.139 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