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L. Parente¹, D. Addessi², B.A. Izzuddin³ and E. Spacone¹

¹Department of Engineering and Geology, University of Chieti-Pescara G. D'Annunzio, Italy
²Department of Structural and Geotechnical Engineering, Sapienza, University of Rome, Italy
³Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom

doi:10.4203/ccc.9.7.3

L. Parente, D. Addessi, B.A. Izzuddin, E. Spacone, "Objectivity and Consistency of the Cracking Response of RC Beams with Conventional Models", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 7.3, 2024, doi:10.4203/ccc.9.7.3

Keywords: beam elements, fiber modeling, bond-slip, concrete damage plasticity, reinforced concrete, regularization.

Abstract

This study addresses model objectivity and consistency in the finite element analysis of reinforced concrete (RC) beams, with a particular focus on bond-slip effects. Classical beam finite element models often assume a perfect bond between concrete and steel reinforcement, leading to inaccuracies in simulating crack initiation and propagation. The behaviors of both displacement-based (DB) and force-based (FB) beam models are explored. Fracture energy-based regularization techniques are used to address mesh dependency and the limitations of the plane section assumption. The paper presents a detailed analysis of perfect-bond and bond-slip models within the DB and FB frameworks, highlighting their effectiveness in capturing the complex interactions in RC structures. Through practical applications and test cases, the performances of the above models are investigated, emphasizing the importance of upgrading existing models and their capability to predict structural behavior in presence of cracking phenomena. Possible enhancements for these models, including higher-order shape functions and advanced numerical integration techniques are discussed. While the problem of localization in compression (crushing) has been extensively studied and solutions have been developed, this work specifically focuses on the localization that occurs at the onset of cracking.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 9 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: P. Iványi, J. Kruis and B.H.V. Topping Paper 7.3 Objectivity and Consistency of the Cracking Response of RC Beams with Conventional Models L. Parente¹, D. Addessi², B.A. Izzuddin³ and E. Spacone¹ ¹Department of Engineering and Geology, University of Chieti-Pescara G. D'Annunzio, Italy ²Department of Structural and Geotechnical Engineering, Sapienza, University of Rome, Italy ³Department of Civil and Environmental Engineering, Imperial College London, London, United Kingdom doi:10.4203/ccc.9.7.3 Full Bibliographic Reference for this paper L. Parente, D. Addessi, B.A. Izzuddin, E. Spacone, "Objectivity and Consistency of the Cracking Response of RC Beams with Conventional Models", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 7.3, 2024, doi:10.4203/ccc.9.7.3 Keywords: beam elements, fiber modeling, bond-slip, concrete damage plasticity, reinforced concrete, regularization. Abstract This study addresses model objectivity and consistency in the finite element analysis of reinforced concrete (RC) beams, with a particular focus on bond-slip effects. Classical beam finite element models often assume a perfect bond between concrete and steel reinforcement, leading to inaccuracies in simulating crack initiation and propagation. The behaviors of both displacement-based (DB) and force-based (FB) beam models are explored. Fracture energy-based regularization techniques are used to address mesh dependency and the limitations of the plane section assumption. The paper presents a detailed analysis of perfect-bond and bond-slip models within the DB and FB frameworks, highlighting their effectiveness in capturing the complex interactions in RC structures. Through practical applications and test cases, the performances of the above models are investigated, emphasizing the importance of upgrading existing models and their capability to predict structural behavior in presence of cracking phenomena. Possible enhancements for these models, including higher-order shape functions and advanced numerical integration techniques are discussed. While the problem of localization in compression (crushing) has been extensively studied and solutions have been developed, this work specifically focuses on the localization that occurs at the onset of cracking. download the full-text of this paper (PDF, 2339 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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