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 ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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

Procedia Structural Integrity 62 (2024) 392–399

II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Investigating the Performance of a Degraded Prestressed Concrete Box Girder Half-joint Bridge in the Spirit of the Italian Guidelines R. Martini a , V. Nicoletti a , S. Carbonari a *, L. Ragni a , A. Brunetti a , D. Coltrinari a , G. Chiappini b , M. Morici c , F. Micozzi c , L. Gioiella c , C. Cacchione d , A. Torsani d , M. Mancina d , F. Gara a , A. Dall’Asta c , L. Dezi e a Department of Construction, Civil Engineering and Architecture (DICEA), Università Politecnica delle Marche, Ancona, Italy b Università degli studi eCampus, Novedrate, Italy Abstract The paper investigates a paired pre-stressed box-girder concrete bridge, according to the framework suggested by the new Italian Guidelines for the risk assessment of existing bridges. The bridges, selected as case study within the research agreement signed by the FABRE Consortium and ANAS S.p.A. for first applications of the Italian Guidelines, present significant age-related degradation phenomena known to the Administrator, who decided for the bridges demolition and reconstruction. Visual inspections confirmed defects in the pre-stressing system, a permanent deflection of the deck, and cracks at half-joints, possibly due to pre-stressing loss and creep effects triggered by the poor quality of concrete. Also, preliminary safety verifications revealed not to meet code requirements in most cross-sections. Consequently, the most degraded bridge was closed. From March 2022, experimental campaigns have been performed by the FABRE Consortium and ANAS for improving their experience on the behaviour of old pre-stressed concrete bridges, as well as to control possible performance loss of the open bridge, sustaining the overall route traffic. The paper summarises these activities and presents some possible future investigations to be carried out before bridge demolition. © 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: prestressed box.girder concrete bridge; half-joints bridge; visual inspections; accurate safety verifications; bridge monitoring. II Fabre Conference – Existing bridges, viaducts and tunnels: research, innovation and applications (FABRE24) Investigating the Performance of a Degraded Prestressed Concrete Box Girder Half-joint Bridge in the Spirit of the Italian Guidelines R. Martini a , V. Nicoletti a , S. Carbonari a *, L. Ragni a , A. Brunetti a , D. Coltrinari a , G. Chiappini b , M. Morici c , F. Micozzi c , L. Gioiella c , C. Cacchione d , A. Torsani d , M. Mancina d , F. Gara a , A. Dall’Asta c , L. Dezi e a Department of Construction, Civil Engineering and Architecture (DICEA), Università Politecnica delle Marche, Ancona, Italy b Università degli studi eCampus, Novedrate, Italy c School of Architecture and Design (SAAD), University of Camerino, Ascoli Piceno, Italy d ANAS S.p.A. Marche Region Department, e Dezi Steel Design (DSD), Ancona, Italy Abstract The paper investigates a paired pre-stressed box-girder concrete bridge, according to the framework suggested by the new Italian Guidelines for the risk assessment of existing bridges. The bridges, selected as case study within the research agreement signed by the FABRE Consortium and ANAS S.p.A. for first applications of the Italian Guidelines, present significant age-related degradation phenomena known to the Administrator, who decided for the bridges demolition and reconstruction. Visual inspections confirmed defects in the pre-stressing system, a permanent deflection of the deck, and cracks at half-joints, possibly due to pre-stressing loss and creep effects triggered by the poor quality of concrete. Also, preliminary safety verifications revealed not to meet code requirements in most cross-sections. Consequently, the most degraded bridge was closed. From March 2022, experimental campaigns have been performed by the FABRE Consortium and ANAS for improving their experience on the behaviour of old pre-stressed concrete bridges, as well as to control possible performance loss of the open bridge, sustaining the overall route traffic. The paper summarises these activities and presents some possible future investigations to be carried out before bridge demolition. © 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: prestressed box.girder concrete bridge; half-joints bridge; visual inspections; accurate safety verifications; bridge monitoring. © 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 c School of Architecture and Design (SAAD), University of Camerino, Ascoli Piceno, Italy d ANAS S.p.A. Marche Region Department, e Dezi Steel Design (DSD), Ancona, Italy

* Corresponding author. Tel.: +39 071 220 4551. E-mail address: s.carbonari@univpm.it * Corresponding author. Tel.: +39 071 220 4551. E-mail address: s.carbonari@univpm.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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