PSI - Issue 39

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 39 (2022) 677–687

© 2021 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 CP 2021 – Guest Editors Abstract Debonding mechanisms in the externally reinforced structural elements have been widely studied by the scientific community since they lead to premature failure in concrete structures. Different numerical models, based on simplified strength approaches, have been proposed in the literature to simulate such debonding phenomena, but often are unable to accurately predict the development of diffuse crack patterns which are typical for reinforced concrete (RC) structures. In this context, the present work aims to propose a cohesive modeling technique, based on a diffuse interface fracture approach, to in-depth investigate the plate-end and mid-span debonding failures in FRP-strengthened RC structural elements. This model, already presented by some of the authors, is used in combination with bond-slip elements, to simulate the stress transfer between the rebars and the surrounding concrete, and with additional cohesive elements along the adhesive/concrete (AC) and adhesive/plate (AP) material interfaces. Numerical simulations have been performed by using the present fracture approach for predicting the load-carrying capacity and the related failure modes of real-scale retrofitted RC elements. The reliability and the effectiveness of the proposed fracture approach have been demonstrated through suitable comparisons with available experimental results. In particular, this model results to be an innovative and versatile numerical tool able to analyze the debonding mechanisms in FRP-strengthened RC elements as well as to provide more accurate crack patterns, including multiple crack branching and coalescence, than commonly used existing models. © 2021 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 CP 2021 – Guest Editors Keywords: Debonding mechanisms, Cohesive zone model, Inter-element fracture approach, FRP-strengthened RC beams. 7th International Conference on Crack Paths Debonding failure analysis of FRP-plated RC beams via an inter-element cohesive fracture approach Umberto De Maio a , Fabrizio Greco a* , Lorenzo Leonetti a , Paolo Nevone Blasi a , Andrea Pra n a a University of Calabria, Department of Civil Engineering, Via P. Bucci Cubo39B, Rende 87036, Italy Abstract Debonding mechanisms in the externally reinforced structural elements have been widely studied by the scientific community since th y lead to premature failur in co crete structure . Different numerical mod ls, based on simplified str gth approaches, hav be n proposed in the literat r to simulat uch debonding phenomena, but often are unable to accurately predict the development of diffuse crack patt rns which are typical for reinforced concrete (RC) str ctur s. In this context, the present work aims to propose a cohesive modeling technique, based on a diffuse int rface fracture app oach, to i -depth investigate the plate-end and mid-span debonding failures in FRP-str ngth ned RC str ctural elements. This model, already presented by some of th authors, is used i combination with bond-slip elements, to simulate the stress transfer betw en the rebars a d the surrounding concrete, and with additional cohesive elements along the adhesive/concrete (AC) d adh siv /plate (AP) material interfaces. Numeri al simulations have been performed by using the present fracture approach for predicting the load-carrying capacity and the related failure mode of r al-scale retrofitted RC elements. The reliability and the e fectiveness of the proposed fracture approach av be n demonstrat d through suitable comparisons with available experimental r sults. In particular, this mo el results to be an innovative and vers tile numerical tool able to analyze the debonding m chanisms in FRP-strengthened RC element as well as to pr ide more accurat crack patterns, including multiple crack bra ching and coalescence, than commonly us d xi ting models. © 2021 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 u der re ponsibility of CP 2021 – Guest Editors Keywords: Debonding mechanisms, Cohesive zone model, Inter-element fracture approach, FRP-strengthened RC beams. 7th International Conference on Crack Paths Debonding failure analysis of FRP-plated RC beams via an inter-element cohesive fracture approach Umberto De Maio a , Fabrizio Greco a* , Lorenzo Leonetti a , Paolo Nevone Blasi a , Andrea Pranno a a University of Calabria, Department of Civil Engineering, Via P. Bucci Cubo39B, Rende 87036, Italy

* Corresponding author. Tel.: +390984496916. E-mail address: fabrizio.greco@unical.it * Corresponding author. Tel.: +390984496916. E-mail address: fabrizio.greco@unical.it

2452-3216 © 2021 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 CP 2021 – Guest Editors 2452-3216 © 2021 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 CP 2021 – Guest Editors

2452-3216 © 2021 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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.141