PSI - Issue 62

ScienceDirect Available online at www.sciencedirect.com ScienceDirect 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 Procedia Structural Integrity 62 (2024) 1014–1019

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II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Repair strategies and objectives of the Autostrada dei Parchi motorway structures Marco Menegotto a *, Luigi Fieno b , Marco C. Rocchi c II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Repair strategies and objectives of the Autostrada dei Parchi motorway structures Marco Menegotto a *, Luigi Fieno b , Marco C. Rocchi c a Professor of Structural Engineering, Sapienza University of Rome, via Ostriana, 8 – 00199 Roma, Italy b Technical Director, MPA Consulting Engineers, Largo Amba Aradam, 11 – 00184 Roma, Italy c Technical Director, Strada dei Parchi SpA, via G.V. Bona, 105 – 00156 Roma, Italy a Professor of Structural Engineering, Sapienza University of Rome, via Ostriana, 8 – 00199 Roma, Italy b Technical Director, MPA Consulting Engineers, Largo Amba Aradam, 11 – 00184 Roma, Italy c Technical Director, Strada dei Parchi SpA, via G.V. Bona, 105 – 00156 Roma, Italy Abstract The Autostrada dei Parchi, comprising the A24 and A25 motorways, is the key infrastructure of Central Italy, linking the West- and East Coasts of the Country, and is located mainly within the Region Abruzzo. It represents the only effective transverse connection, as roads and railway are obsolete and allow for very low capacity. A24+A25 contain a remarkable amount of structural works and run in a quite unfavourable environment, practically all in mountain range, with large temperature excursions, frequent rain/snow fall and high seismicity. Owned and managed by the State, they were designed and built starting in the sixties, at a time when neither professionals nor codes of practice were accounting for durability, seismic engineering was primordial and structural standards, referring to actions, zoning as well as to specifications, were rather poor. In year 2003, Strada dei Parchi SpA (SdP), a private company, took them in charge as a State Concession, through a European tender, inheriting the maintenance problems when structures already needed deep repair and strengthening, also according to new specifications on road, seismic, durability and strategic infrastructure performance. Providing general maintenance and retrofit requires important investments, released by the State on proposal of SdP, as they are far to be covered by the tolls paid by motorway users. Thus, the task is met within complex procedures and timing. Within this framework, the company fulfils the task with a proactive management of the works, based on the compliance with the standards and the search for overall sustainability. Priorities are: first, those linked to users’ safety; then to durability , according to the data of a permanent monitoring and the optimization of repair or rebuilt, before damage may affect the structural reliability. All this coordinated with the undelayable maintenance of the road platform and with the effects of “spot events” . Keywords: Infrastructures; Investments; Structural works; Maintenance; Repair and strengthening. © 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 Abstract The Autostrada dei Parchi, comprising the A24 and A25 motorways, is the key infrastructure of Central Italy, linking the West- and East Coasts of the Country, and is located mainly within the Region Abruzzo. It represents the only effective transverse connection, as roads and railway are obsolete and allow for very low capacity. A24+A25 contain a remarkable amount of structural works and run in a quite unfavourable environment, practically all in mountain range, with large temperature excursions, frequent rain/snow fall and high seismicity. Owned and managed by the State, they were designed and built starting in the sixties, at a time when neither professionals nor codes of practice were accounting for durability, seismic engineering was primordial and structural standards, referring to actions, zoning as well as to specifications, were rather poor. In year 2003, Strada dei Parchi SpA (SdP), a private company, took them in charge as a State Concession, through a European tender, inheriting the maintenance problems when structures already needed deep repair and strengthening, also according to new specifications on road, seismic, durability and strategic infrastructure performance. Providing general maintenance and retrofit requires important investments, released by the State on proposal of SdP, as they are far to be covered by the tolls paid by motorway users. Thus, the task is met within complex procedures and timing. Within this framework, the company fulfils the task with a proactive management of the works, based on the compliance with the standards and the search for overall sustainability. Priorities are: first, those linked to users’ safety; then to durability , according to the data of a permanent monitoring and the optimization of repair or rebuilt, before damage may affect the structural reliability. All this coordinated with the undelayable maintenance of the road platform and with the effects of “spot events” . Keywords: Infrastructures; Investments; Structural works; Maintenance; Repair and strengthening.

* Corresponding author. Tel.: +39 335 6114590. E-mail address: marco.menegotto@gmail.com

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.2024.09.135 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 * Corresponding author. Tel.: +39 335 6114590. E-mail address: marco.menegotto@gmail.com