Using element-embedded rebar model in ANSYS for the study of reinforced and prestressed concrete structures

Lazzari, Bruna Manica; Filho, Américo Campos; Lazzari, Paula Manica; Pacheco, Alexandre Rodrigues

doi:10.12989/cac.2017.19.4.347

Cited by 8 publications

(6 citation statements)

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“…The brick concrete element accommodates defining steel reinforcement by means of smeared or discrete rebars and hence can be used to model concretes with or without reinforcing rebars [46,47]. There are additional optional concrete-based material parameters that can be used to finetune element's behavior, such as concrete shear transfer coefficients, tensile stress, and compressive strength.…”

Section: Considerations For Element Typesmentioning

confidence: 99%

Modeling Strategies of Finite Element Simulation of Reinforced Concrete Beams Strengthened with FRP: A Review

2021

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Fiber-reinforced polymer (FRP) composites do not only possess superior mechanical properties, but can also be easy to tailor, install, and maintain. As such, FRPs offer novel and attractive solutions to facilitate strengthening and/or retrofitting of aging, weakened, and upgraded structures. Despite the availability of general code provisions, the design and analysis of FRP-strengthened concrete structures is both tedious and complex—especially in scenarios associated with unique loading conditions. As such, designers often leverage advanced finite element (FE) simulation as a mean to understand and predict the performance of FRP-strengthened structures. In order to narrow this knowledge gap, this paper details suitable strategy for developing and carrying out advanced FE simulations on FRP-strengthened concrete structures. The paper also covers techniques related to simulating adhesives (bonding agents), material constitutive properties and plasticity (cracking/crushing of concrete, yielding of steel reinforcement, and delamination of FRP laminates), as well as different material types of FRP (CFRP, GFRP, and their hybrid combinations), and FRP strengthening systems (sheets, plates, NSM, and rods) under various loading conditions including ambient, earthquake, and fire. The principles, thumb rules, and findings of this work can be of interest to researchers, practitioners, and students.

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Section: Considerations For Element Typesmentioning

confidence: 99%

Modeling Strategies of Finite Element Simulation of Reinforced Concrete Beams Strengthened with FRP: A Review

2021

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“…Another line involving finite element models in the ANSYS software is based on the development of new finite elements (solid and plane) using user programmable features, which allow the inclusion of new material models that are not available in the library. Lazzari et al (2017) used these features to develop elastoplastic and viscoelastoplastic constitutive models, combined with the Ottosen (1997) failure criterion for prediction of the behaviour of reinforced and prestressed concrete [18] [19]. The present work presents a case study of a column with non-usual cross-section used in a Brazilian popular housing project of buildings with up to four floors.…”

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confidence: 99%

Behavior of precast reinforced concrete columns subjected to monotonic short-term loading

Pereira

Carvalho

Dias

et al. 2019

Frattura Ed Integrità Strutturale

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This paper presents a case study on the behaviour of precast reinforced columns with non-conventional cross-section. An experimental program was developed to verify the serviceability and ultimate limit states of these columns, loaded with eccentric compression forces. In addition, results obtained through a theoretical model based on the Brazilian standard ABNT NBR 6118:2014 and a Finite Element numerical model using ANSYS software were presented. Analysis of the results showed that the proposed models satisfactorily predicted column behaviour. However, the ultimate strength of the column could not be determined due to limitations in the formulation of the theoretical model. The numerical model presented good agreement with the experimental results, both in serviceability and in ultimate limit state.

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“…The UMAT procedure is called in every Gauss point and has to update: the stress vector, the internal variables and the material stiffness matrix. User procedures are common in scientific research [ 32 , 51 , 53 ], since they enable the user to focus on a specific phenomenon and the rest of the numerical model can be covered with algorithms available in the FEM code.…”

Section: Proposed Solution Strategymentioning

confidence: 99%

“…Case study 3 concerns the failure of beam OA-1 without stirrups in shear, which was one of the series tested by Bresler and Scordelis [ 66 ]. This is a classic benchmark for validating new NLFEA strategies for RC structures [ 17 , 18 , 53 , 67 , 68 ]. Due to the popularity of this experimental data, beams with similar material parameters and dimensions were re-examined by Vecchio and Shim [ 69 ].…”

Section: Verification and Validation Of The Proposed Strategymentioning

confidence: 99%

Numerically Efficient Three-Dimensional Model for Non-Linear Finite Element Analysis of Reinforced Concrete Structures

Dudziak

2021

Materials

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The paper concerns the non-linear finite element analysis (NLFEA) of Reinforced Concrete (RC) structures for engineering applications. The required level of complexity of constitutive models for such analysis was discussed and non-linear elastic models combined with the smeared cracking approach proved to be efficient. A new constitutive hypoelastic-brittle model of concrete based on these assumptions was proposed. Moreover, a method including the tension stiffening effect (TS) was developed. This phenomenon is connected with the bond properties between concrete and steel and, in some situations, has significant influence on the deflections of RC structures. It is often neglected by or included in the constitutive model of concrete. In the paper, an alternative approach was presented, in which this phenomenon is taken into account by generalising the material model of reinforcing steel. This approach is consistent with modern design standards and has solid physical foundations. The proposed models were implemented in the Abaqus code via UMAT user’s procedure coded in FORTRAN. Model verification and validation were presented in four case studies, concerning: a Willam’s test (examination on material point level), a beam with bending failure, and two beams with shear failure (with and without stirrups). The obtained results were compared with experimental outcomes and numerical results obtained by other researchers. The presented approach enables the accurate prediction not only of load capacity but of structural deformability, due to the precise description of TS. Thus, it promises to be a useful engineering tool.

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Using element-embedded rebar model in ANSYS for the study of reinforced and prestressed concrete structures

Cited by 8 publications

References 0 publications

Modeling Strategies of Finite Element Simulation of Reinforced Concrete Beams Strengthened with FRP: A Review

Modeling Strategies of Finite Element Simulation of Reinforced Concrete Beams Strengthened with FRP: A Review

Behavior of precast reinforced concrete columns subjected to monotonic short-term loading

Numerically Efficient Three-Dimensional Model for Non-Linear Finite Element Analysis of Reinforced Concrete Structures

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