PSI - Issue 64

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 64 (2024) 2133–2140 Structural Integrity Procedia 00 (2023) 000 – 000

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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 SMAR 2024 Organizers 10.1016/j.prostr.2024.09.315 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 SMAR 2024 Organizers 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 SMAR 2024 Organizers Abstract The maintenance of existing bridges sometimes requires an intervention to increase their residual bearing capacity during their service life. The bridge strengthening can modify significantly the original structural behaviour, but, in many cases, the lack of a specialized standard for existing structures in the past prevented the designer to operate a suitable check of the updated performance. In the paper, an example of a three-span overpass, built in the sixties in Lombardia, is investigated. Around ten years ago a significant restoration was carried out due to the bad conditions of the infrastructure: the P/C beams were retrofitted by means of CFRP strips and the top slab over the two internal piers was also strengthened by additional reinforcement. After a basic diagnostic aimed at verifying the mechanical characteristics declared in the documentation attached to the drawings and the pictures of the retrofitting intervention, a load test driven by a preventive structural analysis carried out by means of a linear elastic approach allowed to fix a control procedure aimed at guaranteeing the safety conditions in the future time. The discussion on the adopted procedure is the main goal of the paper. Keywords: Existing bridge, CFRP retrofitting, safety assessment, loading test, monitoring 1. Introduction The maintenance of a bridge should be ruled by a suitable plan, presented at the time of construction. In fact, it is acknowledged that an adequate durability begins with the design stage, through an evaluation of the lifetime performance and a suitable plan for the maintenance of its functionality. In this way, the structure degradation which may occur during service life, does not reduce the structural performance below the expected level. In managing the integrity and safety of infrastructural assets, the objective of planning is to optimize the efficiency of the investments * Corresponding author. Tel.: +39-031-642511. E-mail address: marco.diprisco@dscerba.com * Corresponding author. Tel.: +39-031-642511. E-mail address: marco.diprisco@dscerba.com SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Safety assessment of a CFRP retrofitted bridge Marco di Prisco a,b, *, Lorenzo Radice a , Matteo Colombo b a DSC-Erba s.r.l., via Fiume 9, Erba 22036, Italy b Politecnico di Milano, Department of Civil and Environmental Engineering, Milan, Italy Abstract The maintenance of existing bridges sometimes requires an intervention to increase their residual bearing capacity during their service life. The bridge strengthening can modify significantly the original structural behaviour, but, in many cases, the lack of a specialized standard for existing structures in the past prevented the designer to operate a suitable check of the updated performance. In the paper, an example of a three-span overpass, built in the sixties in Lombardia, is investigated. Around ten years ago a significant restoration was carried out due to the bad conditions of the infrastructure: the P/C beams were retrofitted by means of CFRP strips and the top slab over the two internal piers was also strengthened by additional reinforcement. After a basic diagnostic aimed at verifying the mechanical characteristics declared in the documentation attached to the drawings and the pictures of the retrofitting intervention, a load test driven by a preventive structural analysis carried out by means of a linear elastic approach allowed to fix a control procedure aimed at guaranteeing the safety conditions in the future time. The discussion on the adopted procedure is the main goal of the paper. Keywords: Existing bridge, CFRP retrofitting, safety assessment, loading test, monitoring 1. Introduction The maintenance of a bridge should be ruled by a suitable plan, presented at the time of construction. In fact, it is acknowledged that an adequate durability begins with the design stage, through an evaluation of the lifetime performance and a suitable plan for the maintenance of its functionality. In this way, the structure degradation which may occur during service life, does not reduce the structural performance below the expected level. In managing the integrity and safety of infrastructural assets, the objective of planning is to optimize the efficiency of the investments © 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 SMAR 2024 Organizers Safety assessment of a CFRP retrofitted bridge Marco di Prisco a,b, *, Lorenzo Radice a , Matteo Colombo b a DSC-Erba s.r.l., via Fiume 9, Erba 22036, Italy b Politecnico di Milano, Department of Civil and Environmental Engineering, Milan, Italy SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures