PSI - Issue 44

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Sci nceDir t Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 44 (2023) 681–688

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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.2023.01.089 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 T e Authors. Published by ELSEVIER B.V. This is n 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 © 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. Abstract In the last decade, the Italian bridge heritage, mostly made of ordinary or pre-stressed Reinforced Concrete (RC) elements, has increasingly shown signs of ageing, testified by the recent collapses as consequences of concurrent lack of maintenance, degradation of materials, increase in vehicular traffic and exceptional actions (e.g. due to landslides and floods). The recent Italian “Guidelines for classification and risk management of existing bridges” confirm the large interest at policy-making level for accurately assessing ordinary and ultimate performances of existing bridges, through a multi-level approach. As for the numerical simulations, to date Non-Linear Analysis (NLA) methods have been proposed in the literature only for designing new RC bridges. Among the others, EuroCode 2 (EC2) proposes a specific method for simulating the structural performance of new RC bridges, based on a specific safety-format (SF), where the mean values are the representative strengths for materials. In this paper, the application of the EC2 method, proposed for new RC bridges, is critically reviewed in order to examine its applicability to existing RC bridges. The use of the representative strengths is discussed, in relation to the current knowledge level achieved before the structural assessment. Estimation of modelling uncertainty is proposed to define some acceptance criteria for the specific numerical solution strategy to be used, following the most recent international research outputs. Finally, the relationship between the predictions provided by nonlinear analysis and those obtained by linear methodologies involving different levels of modelling detail is comparatively investigated with reference to a specific case study. Gianfranco De Matteis a, *, Silvia Caprili b , Sandro Carbonari c , Corrado Chisari a , Michele D'Amato d , Francesca Mattei b , Mattia Zizi a , Franco Braga e , Andrea Dall'Asta f , Fabrizio Gara c , Walter Salvatore b a University of Campani “Luigi Vanvitelli”, via San Lorenzo, Aversa 81031, Italy b University of Pisa, Largo L. Lazzarino 1, 56122 Pisa, Italy c Università Politecnica delle Marche, via Brecce BIanche 12, Ancona 60131, Italy d University of Basilicata, Via Lanera, 75100 Matera, Italy. e Sapienza University of R me University “Sapienza”, Via Eudossi na 18, 00184 Rome. f University f Camerino, Viale della Rimembranz , 63100 Ascoli Piceno Italy Abstract In the last decade, the Italian bridge heritage, mostly made of ordinary or pre-stressed Reinforced Concrete (RC) elements, has increasingly shown signs of ageing, testified by the recent collapses as consequences of concurrent lack of maintenance, degradation of materials, increase in vehicular traffic and exceptional actions (e.g. due to landslides and floods). The recent Italian “Guidelines for classification an risk m nagement of existing bridges” confirm the large interest at policy-making level for accurately assessing ordinary and ultimate performanc s of xisting bridges, through a multi-level approach. As f r the numeri al simulations, to date Non-Linear Analysis (NLA) methods have been prop sed in the literature only for designing new RC bridges. Among the others, EuroCode 2 (EC2) proposes a specific method for simulating the structural performance of new RC bridges, based on a specific safety-format (SF), where the mean values are the r presentative strengths for materials. In this paper, the application of the EC2 method, proposed for new RC bridges, is critically reviewed in order to examine its applicability to existing RC bridges. The use of the representative strengths is discussed, in relation to the current knowledge level achi ved before the structural ssessment. Estimation of modelling uncertainty is proposed to define some acceptance criteria for the specific numerical solution strategy to be used, following the most recent international research outputs. Finally, the relationship between the predictions provided by nonlinear an lysis and those obtained by linear methodologies involving different levels of modelling detail is comparatively investigated with reference to a specific case study. XIX ANIDIS Conference, Seismic Engineering in Italy Critical issues in safety assessment of existing reinforced concrete bridges by means of nonlinear analysis Gianfranco De Matteis a, *, Silvia Caprili b , Sandro Carbonari c , Corrado Chisari a , Michele D'Amato d , Francesca Mattei b , Mattia Zizi a , Franco Braga e , Andrea Dall'Asta f , Fabrizio Gara c , Walter Salvatore b a University of Campania “Luigi Vanvitelli”, via San Lorenzo, Aversa 81031, Italy b University of Pisa, Largo L. Lazzarino 1, 56122 Pisa, Italy c Università Politecnica delle Marche, via Brecce BIanche 12, Ancona 60131, Italy d University of Basilicata, Via Lanera, 75100 Matera, Italy. e Sapienza University of Rome University “Sapienza”, Via Eudossiana 18, 00184 Rome. f University of Camerino, Viale della Rimembranza, 63100 Ascoli Piceno Italy XIX ANIDIS Conference, Seismic Engineering in Italy Critical issues in safety assessment of existing re forced concrete bridges by means of nonlinear analysis * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: gianfranco.dematteis@unicampania.it * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: gianfranco.dematteis@unicampania.it