PSI - Issue 44

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

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Procedia Structural Integrity 44 (2023) 745–749

XIX ANIDIS Conference, Seismic Engineering in Italy Reflections on the necessity or not of interventions for the XIX ANIDIS Conference, Seismic Engineering in Italy Reflections on the necessity or not of interventions for the

adaptation of existing bridges Michele Frizzarin a *, Paolo Franchetti a a Franchetti Spa, P.le della Vittoria 7, 36071 Arzignano, Italy adaptation of existing bridges Michele Frizzarin a *, Paolo Franchetti a a Franchetti Spa, P.le della Vittoria 7, 36071 Arzignano, 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 scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. © 2022. 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 scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy Keywords: Existing bridges, seismic adaptation, traffic loads The study aims to analyze the xtent of traffic loads on the substructures of existing bridges, with a regulatory exc rs s starting from 1933, in order to assess t e actual contribution to the total vertical loads and t the seismic r sponse of th se structures. Such reflections are imp rtant i light of the vast heritage of bridges existing in Italy, most of which were built more than 50 years ago, thus undergoing more than one regulatory review. © 2022. The authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativeco mons.org/licenses/by-nc nd/4.0 ) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy Keywords: Existing bridges, seismic adaptation, traffic loads Abstract The new Technical Standards for Construction (NTC 2018) introduce, compared to the previous standards, the criteria for the definition of interventions on existing bridges (C.8.8.7). In particular, for the adaptation intervention, usually difficult to apply in contexts of existing and historical bridges, reference is made to the control of the 10% variation of the foundation loads referred to in §8.4.3 point c). It is not clear, however, whether or not this variation should include traffic loads, which for bridges often represent a completely non-negligible contribution but which have undergone, over the years and the advent of new regulations, even significant increases, especially for small spans. The study aims to analyze the extent of traffic loads on the substructures of existing bridges, with a regulatory excursus starting from 1933, in order to assess the actual contribution to the total vertical loads and to the seismic response of these structures. Such reflections are important in light of the vast heritage of bridges existing in Italy, most of which were built more than 50 years ago, thus undergoing more than one regulatory review. Abstract The new Technical Sta dards for Construction (NTC 2018) introduce, compared to the pre ious standards, the criteria for the definition of interventions on existing bridges (C.8.8.7). In particular, for the adaptation intervention, usually difficult to apply in contexts of existing and historic l bridg s, reference is made to the contr l of the 10% variation of the foundation loads referred to in §8.4.3 point c). It is not clear, however, whether or not this variation should include traffic loads, which for bridges often represent a ompletely non-negligible contribution but which have undergone, over the years and the advent of new regulations, even significant incre ses, especially f r small spans.

* Corresponding author. Tel.: +39 0444 671443 E-mail address: michele.frizzarin@franchetti.tech * Corresponding author. Tel.: +39 0444 671443 E-mail address: michele.frizzarin@franchetti.tech

2452-3216 © 2022 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 scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy 2452-3216 © 2022 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 scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy

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 scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. 10.1016/j.prostr.2023.01.097