PSI - Issue 33

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 ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 33 (2021) 954–965

© 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 the scientific committee of the IGF ExCo Abstract The accurate analysis of cracking phenomena in the concrete structures has been a research topic of growing interest over the past few decades, with notable developments in the modeling techniques based on either smeared or discrete fracture approaches. The well-known cohesive zone models, belonging to discrete fracture approaches, are commonly judged as very effective for accurately representing the real crack pattern in quasi-brittle materials. The present work deals with comparing two different finite element based cohesive fracture models: (i) a novel diffuse interface model, and (ii) an existing embedded crack model, based on an inter- and intra- element fracture approach, respectively. The first one relies on an intrinsic cohesive formulation by which the damage process inside the material is represented as a collection of imperfect interfaces randomly placed at the internal boundaries of a finite element mesh. The second one is based on a strong discontinuity approach according to which the crack is modeled as a discontinuity embedded into the displacement field of a standard continuum, allowing concrete cracking along nonprescribed paths to be correctly simulated. Cracking behavior in concrete specimens subjected to general loading conditions has been simulated by these two models and a detailed comparison between the numerical results is provided. Finally, a critical discussion regarding of computational efficiency and numerical accuracy highlights the efficacy of the newly proposed diffuse interface model. © 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Concrete cracking phenomena; Quasi-brittle materials; Cohesive fracture approach; Diffuse interface model; Embedded crack model. IGF26 - 26th International Conference on Fracture and Structural Integrity Finite element analysis of concrete cracking: a comparative study between a diffuse interface model and an embedded crack model Umberto De Maio a , David Cendón b , Fabrizio Greco a, *, Lorenzo Leonetti a , Paolo Nevone Blasi a , Andrea Pranno a a Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo39B, Rende 87036, Italy b Universidad Politécnica de Madrid, E.T.S. Ingenier s de Caminos, Canales y P ertos, Dep. Ciencia de Materiales, C/Profesor Aranguren 3, 28040 M drid, Spain Abstract The accurate analysis of cracking phenomena in the concrete structures has been a research topic of growing interest over the past few de ades, with notable develo m ts in the modeli g techniques based on either meared or disc ete fractur approaches. The well-known cohesive zone models, b longing to discrete fra ture approaches, are com only judged as v ry effective f r accurately representi g the real crack patt rn in quasi-brittle mat rials. The resent work deals with comparing two di rent finite elem nt bas d cohesive f actu e models: (i) a novel diffuse in f ce model, and (ii) an existing embedded crack mod l, based on an inter- and intra- element fracture approach, respectively. The first one relies on an intr nsic cohesive formulation by which the damage process inside the m terial is represented as a collection of imperf ct i terfaces randomly placed at the i ternal boundaries of a finit element m sh. The second on is b ed on a strong discontinuity approach according to whic the c ack is model d as discontinuity e bedded into the displacement field of a stan ard co tinuum, allowing ncrete cracking along nonprescrib p ths to be correctly simulated. Cracking behavior in concrete specimens subjected t general loading conditions has been simulated by these two models and a detailed comparis n between he numerical resul s is provided. Finally, a critical discussion regarding of computational efficiency and numeric l accuracy highlights th efficacy of the newly proposed diffuse interface model. © 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 Statement: Peer-revi w under responsibility of th scientifi committee of the IGF ExCo Keywords: Concrete cracking phenomena; Quasi-brittle materials; Cohesive fracture approach; Diffuse interface model; Embedded crack model. IGF26 - 26th International Conference on Fracture and Structural Integrity Finite element analysis of concrete cracking: a comparative study between a diffuse interface model and an embedded crack model Umberto De Maio a , David Cendón b , Fabrizio Greco a, *, Lorenzo Leonetti a , Paolo Nevone Blasi a , Andrea Pranno a a Department of Civil Engineering, University of Calabria, Via P. Bucci Cubo39B, Rende 87036, Italy b Universidad Politécnica de Madrid, E.T.S. Ingenieros de Caminos, Canales y Puertos, Dep. Ciencia de Materiales, C/Profesor Aranguren 3, 28040 Madrid, Spain

* Corresponding author. Tel.: +390984496916. E-mail address: fabrizio.greco@unical.it * Corresponding author. Tel.: +390984496916. E-mail ad ress: 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 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 Statement: Peer-revi w under responsibility of th scientifi committee of the IGF ExCo

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 the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.106