Finite element modelling of plain and reinforced concrete specimens with the Kotsovos and Pavlovic material model, smeared crack approach and fine meshes

Markou, George; Roeloffze, Wynand

doi:10.1177/1056789520986601

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…A similar approach will be used, and adjustments will be made where needed to model the RC waffle slabs that are bare or retrofitted with CFRP plates. It is important to note here that Reconan FEA was validated through the use of experimental results as presented in [5][6][7][8].…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Retrofitting Waffle Slabs With Carbon Fibre Reinforced Polymer Plates

Jung,

Markou

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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As a result of shopping centres closing and being converted into either accommodation or factories, engineers have been needing to come up with new and innovative solutions to help increase the strength and decrease the deflection of already built concrete structures. If the structure's purpose was to change, then the building would need to be redesigned to ensure its structural integrity. The objective of this study is to investigate the effects that retrofitted Carbon Fibre Reinforced Polymer (CRFP) plates have on the strength of healthy and corroded waffle slabs. 3D state-of-the-art finite element modeling software will be used to create accurate models that can be used to perform nonlinear analyses. Within these models, factors such as deteriorated concrete and corroded steel will also be modelled to investigate the effects of using CFRP plates as a strengthening approach to deteriorated Reinforced Concrete (RC) structures, and in this case with waffle slabs.

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Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Retrofitting Waffle Slabs With Carbon Fibre Reinforced Polymer Plates

Jung,

Markou

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Modelling in 3D considers the effect of out-of-plane stresses, where the stressstrain relationship for each stress-state is expressed by the hydrostatic (σ 0 ) and deviatoric components (τ 0 ) ( Markou & Roeloffze 2021). The recent research work presented by describes how the corresponding hydrostatic and deviatoric strains (ε 0 , γ 0 ) are used to produce the hydrostatic and deviatoric stresses, by using a material model proposed by Kotsovos and Pavlovic (1995) and extended by Markou and Papadrakakis (2013).…”

Section: Modelling Of Concrete and Soil Materialsmentioning

confidence: 99%

“…For this reason, the FEM-based software (ReconanFEA 2020) is used for the needs of this research work. Furthermore, by analysing numerical models under different loading conditions and using a variety of meshes, it can be determined if the structural design is safe or not (Markou & Roeloffze 2021). Modelling of piles embedded in soil was performed by , where experimental and numerical results showed that ReconanFEA (2020) has the ability to objectively capture the mechanical response of this complex problem.…”

Section: Introductionmentioning

confidence: 99%

Advanced numerical modelling of the nonlinear mechanical behaviour of a laterally loaded pile embedded in stiff unsaturated clay

Braun¹,

Bakas²,

Markou³

et al. 2023

J. S. Afr. Inst. Civ. Eng.

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Capturing and understanding the ultimate limit state behaviour of reinforced concrete piles embedded in soil requires the use of advanced tools or the performance of expensive tests. An experiment was performed where reinforced concrete piles embedded in a stiff unsaturated clay profile were load-tested on-site. However, even though in-situ experiments can provide engineers with valuable insight, their cost and time limitations come with restrictions, especially when dealing with a parametric investigation on the soil's material properties, the size of the piles, or the piles' material properties. The objective of this research work was to numerically model the nonlinear mechanical behaviour of laterally loaded full-scale piles through detailed 3D modelling, and perform an in-depth parametric investigation to provide answers to unknown factors that the actual physical experiment could not answer. Furthermore, this work serves as a pilot project that will be used to pave the way in developing multiple soil-structure interaction models that will be used to generate a dataset that helps the creation of predictive models through machine learning algorithms. For the needs of this research work, the reinforced concrete piles were discretised with 8-noded isoparametric hexahedral elements that accounted for cracking through the smeared crack approach. Steel reinforcement bars and stirrups were simulated as embedded rebar elements, while the soil domain was also discretised through 8-noded hexahedral elements. Most of the required material properties assumed during the nonlinear analyses were defined according to relevant laboratory experiments. According to the numerical investigation, it was found that the proposed numerical model has the ability to reproduce the experimental results with high accuracy, while providing in-depth insight on the failure mechanisms for both the soil and reinforced concrete domains.

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“…However, this approach can lead to excessive cracking in order to represent a severely damaged state. Although the model doesn't appear to have mesh sensitivity issues [10], it is difficult to prove with the current algorithmic approach. To control the smeared cracking, a crack band approach [11] must be applied.…”

Section: Introductionmentioning

confidence: 99%

A 3d Fracture Energy-Based Smeared Crack Approach for the Nonlinear Behavior of Reinforced Concrete Structures

Mourlas,

Markou,

Papadrakakis

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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This research study presents a novel energy-based constitutive model of concrete in the framework of the smeared crack approach. The proposed model constitutes an extension to a previous numerical model [1,2] with an addition of a fracture energy-based algorithmic approach developed by [3]. The uncracked behavior of concrete is based on the experimental evidence of the triaxial behavior of concrete described in the literature [4]. The cracked behavior of concrete is modelled with a fracturing approach while cracking is treated with the smeared crack approach. The proposed modelling approach manages to capture the behavior of reinforced concrete (RC) structures with computational efficiency and numerical accuracy as it combines the experimental triaxial behavior of concrete in an algorithmic framework that can alleviate numerical issues of nonlinear concrete behavior such as cracking. The numerical simulation is implemented by using hexahedral isoparametric finite elements for discretizing the concrete domain and truss elements for the steel reinforcement. The proposed approach has been tested on two RC specimens focusing on structural members with insufficient shear reinforcement and high shear stresses. The numerical behavior has been validated by the comparison of the numerical with experimental data found in the international literature. The effect of choosing different approaches of the smeared crack method (fixed and rotated) is also investigated.

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Finite element modelling of plain and reinforced concrete specimens with the Kotsovos and Pavlovic material model, smeared crack approach and fine meshes

Cited by 10 publications

References 24 publications

Numerical Investigation of Retrofitting Waffle Slabs With Carbon Fibre Reinforced Polymer Plates

Numerical Investigation of Retrofitting Waffle Slabs With Carbon Fibre Reinforced Polymer Plates

Advanced numerical modelling of the nonlinear mechanical behaviour of a laterally loaded pile embedded in stiff unsaturated clay

A 3d Fracture Energy-Based Smeared Crack Approach for the Nonlinear Behavior of Reinforced Concrete Structures

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