PSI - Issue 41

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 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 41 (2022) 598–609

© 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 MedFract2Guest Editors. Abstract The simulation of cracking behavior in reinforced concrete structures is one of the most challenging tasks of engineering practice due to the highly complex phenomena which arise in the structural element under both ultimate and service loads such as the interaction between concrete and steel reinforcement, crack coalescence and branching, and multiple crack propagation. In the literature, the most known and well-established constitutive models for concrete are based on a continuum representation for this material, in which both kinematic and static variables (i.e. strains and stresses) possess regular spatial distributions. However, due to the discrete nature of the cracks, this hypothesis should be removed for a concrete cracking analysis to be correct. In this context, the present work aims to investigate the cracking behavior, in terms of crack width and crack spacing, in reinforced concrete structures by means of a discrete fracture approach implemented in a finite element framework. In particular, such a model relies on an inter-element cohesive model to simulate crack onset and propagation used in combination with an embedded truss model to reproduce the mechanical behavior of the steel rebars as well as their interaction with the surrounding concrete. The adopted integrated model has been employed to perform numerical simulations for predicting the load-carrying capacity and the related crack pattern of real-scale reinforced concrete structural elements. Comparisons with experimental outcomes, in terms of loading curve, crack width and crack spacing, have demonstrated the capabilities and effectiveness of the proposed model to investigate the cracking behavior in reinforced concrete structures providing more accurate crack patterns, than existing models. © 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 MedFract2Guest Editors. Keywords: Cracking behavior; reinforced concrete structures; cohesive fracture model, embedded truss model; 2nd Mediterranean Conference on Fracture and Structural Integrity Cracking behavior analysis of reinforced concrete structures by using a cohesive fracture model 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. Abstract The simulation of cracking behavior in reinforced concrete structures is one of the most challenging tasks of engineering practice du to the highly omplex phenomena which arise i th al elem nt under both u timate and service loads such s th int raction between concrete a d st el reinforcem nt, crack coalescence a d branching, and multiple crack pr pagation. In literature, th most kn wn and well- stablished constitutive m del for concrete re based on a continuum represent ti for t is material, in which both ki ematic and static variables (i.e. strains and stresses) poss ss r gular spatial distributions. However, due to the discrete nature of the cracks, this hypothesis should be emove fo a concrete cracking analysis to be correct. In this context, he present work aims o investigate t e cracking behavior, in terms of rack width and crack pacing, in inforced crete structur s by means of a d scr te fractur approach implemented in a finite element framework. In rticular, such a model relies on an inter-ele e t c hesive model to simulate crack onset a d prop gation used i combination with an embedded truss mod to reproduc th echanical behavior f the st el rebars as well as their i teractio with the surroundi g concr te. The adopted integrated model has been employed to p rform numerical simulations for predicting e load-carrying capa ity and the rela crack pattern of real-scale r inforc c ncrete structural elements. C mparisons with exp riment l outcomes, in terms of loading urve, crack width and crack spa ing, have demonstrated the capabilities and effectiveness of the prop sed mod l to investigate the cra king behavior in einforced concret structures providing more accurate cra k patterns, an existing ls. © 2022 The Authors. Publ shed 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 MedFract2Guest Editors. K ywords: Cracking b havior; reinforced concrete structures; cohesive fracture model, embedded truss model; 2nd Mediterranean Conference on Fracture and Structural Integrity Cracking behavior analysis of reinforced concrete structures by using a cohesive fracture model 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 © 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 MedFract2Guest Editors. 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 u der responsibility of t MedFract2Guest Editors.

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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.068