Lattice Discrete Particle Modeling of concrete coupled creep and shrinkage behavior: A comprehensive calibration and validation study

Abdellatef, Mohammed; Boumakis, Ioannis; Wan‐Wendner, Roman; Alnaggar, Mohammed

doi:10.1016/j.conbuildmat.2019.03.176

Cited by 20 publications

(9 citation statements)

References 60 publications

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“…Similar work was also found in Abdellatef et al (2019). Although exhibiting sufficient accuracy, the lattice discrete particle model adopted in Boumakis et al and Abdellatef et al (2019) essentially is not a continuum model and is not suitable for structural analysis. Li et al (2019) realized the nonlinear time-dependent analysis of prestressed concrete bridges considering cracking, creep, and shrinkage within the framework of Abaqus/Standard.…”

Section: Introductionsupporting

confidence: 55%

“…Recently, Luzio′s continuum method was replaced with a discrete element model in the work by Boumakis et al (2018). Similar work was also found in Abdellatef et al (2019). Although exhibiting sufficient accuracy, the lattice discrete particle model adopted in Boumakis et al and Abdellatef et al (2019) essentially is not a continuum model and is not suitable for structural analysis.…”

Section: Introductionmentioning

confidence: 94%

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Gradient Nonlocal Enhanced Microprestress-Solidification Theory and Its Finite Element Implementation

Tong

Du²,

Liu³

et al. 2021

Front. Mater.

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Time-dependent responses of cracked concrete structures are complex, due to the intertwined effects between creep, shrinkage, and cracking. There still lacks an effective numerical model to accurately predict their nonlinear long-term deflections. To this end, a computational framework is constructed, of which the aforementioned intertwined effects are properly treated. The model inherits merits of gradient-enhanced damage (GED) model and microprestress-solidification (MPS) theory. By incorporating higher order deformation gradient, the proposed GED-MPS model circumvents damage localization and mesh-sensitive problems encountered in classical continuum damage theory. Moreover, the model reflects creep and shrinkage of concrete with respect to underlying moisture transport and heat transfer. Residing on the Kelvin chain model, rate-type creep formulation works fully compatible with the gradient nonlocal damage model. 1-D illustration of the model reveals that the model could regularize mesh-sensitivity of nonlinear concrete creep affected by cracking. Furthermore, the model depicts long-term deflections and cracking evolutions of simply-supported reinforced concrete beams in an agreed manner. It is noteworthy that the gradient nonlocal enhanced microprestress-solidification theory is implemented in the general finite element software Abaqus/Standard with the implicit solver, which renders the model suitable for large-scale creep-sensitive structures.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 94%

Gradient Nonlocal Enhanced Microprestress-Solidification Theory and Its Finite Element Implementation

Tong

Du²,

Liu³

et al. 2021

Front. Mater.

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“…For these reasons, the discrete approaches are more effective compared to continuum approaches, yet of course they are more computationally demanding. Based on the authors experience in using both the discrete (1D conduit) scheme and the FE continuum (3D tetrahedral elements) scheme in many previous research applications concerning aging, creep, shrinkage and Alkali Silica Reaction (ASR) problems [32,33,34,35,36], they noticed that the discrete mesh requires no more than 50% of computational time compared to continuum mesh with similar refinement. This difference has not been quantitatively evaluated but the authors have consistently observed it in their work.…”

Section: Significance Of the Proposed Researchmentioning

confidence: 99%

“…For details on the calibration and validation of this theory see [39]. This model was coupled in many research works with LDPM to successfully represent and predict concrete long term behavior under coupled shrinkage, creep, ASR degradation [76,77,34,35,36,78,79,32,33].…”

Section: Coupling With the Htc Modelmentioning

confidence: 99%

Coupled multi-physics simulation of chloride diffusion in saturated and unsaturated concrete

Zhang

Luzio

Alnaggar

2021

Construction and Building Materials

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Chloride-induced corrosion of steel reinforcement is one of the major long-term deterioration mechanisms for reinforced concrete infrastructures. Chloride transport through cement-based materials is a complex chemo-physical process involving ionic diffusion in concentrated solution, pore structure, chemistry, membrane permeability of the matrix, cracking, and the variation of the internal and external environmental conditions. Although in the literature there are plenty of both simplistic phenomenological models and sophisticated models, in this study, a new model is developed taking aim at capturing the fundamental physics and, at the same time, having a formulation as simple as possible that it can be effectively calibrated and validated using available limited experimental data. The model couples the ionic diffusion process with the concrete micro-structure evolution due to continued hydration accounting for hygro-thermal variations and their effects on both the diffusion and hydration processes. The formulation is implemented in a semi-discrete conduit transport network that mimics the internal heterogeneity of the cementitious material by connecting the matrix space between coarse aggregate pieces. This allows the model to replicate naturally the meso-scale tortuosity effect which is an important feature towards representing realistically the heterogeneity-induced variations of chloride concentration within the concrete. The limited model parameters are carefully calibrated and the formulation is validated by simulating multiple experiments ranging from diffusion through pastes to large concrete cylinders. The results of numerical simulations show the ability of the model to describe spatial and temporal evolution of the chloride concentration within the samples under varying chloride concentrations and temperature boundary conditions within both saturated and 1 unsaturated concrete.

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“…In order to simulate the crack initiation and propagation during fracture of cementitious materials, attention should be paid to the determination of input parameters. Recently, research concerning the calibration and validation in LDPM [42,43] shows great success in lattice modeling. LBM input parameters necessary for fracture simulation are described below, together with their effect on the macroscopic model response.…”

Section: Calibrationmentioning

confidence: 99%

Lattice Fracture Model for Concrete Fracture Revisited: Calibration and Validation

et al. 2020

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The lattice fracture model is a discrete model that can simulate the fracture process of cementitious materials. In this work, the Delft lattice fracture model is reviewed and utilized for fracture analysis. First, a systematic calibration procedure that relies on the combination of two uniaxial tensile tests is proposed to determine the input parameters of lattice elements—tensile strength, compressive strength and elastic modulus. The procedure is then validated by simulating concrete fracture under complex loading and boundary conditions: Uniaxial compression, three-point bending, tensile splitting, and double-edge-notch beam shear. Simulation results are compared to experimental findings in all cases. The focus of this publication is therefore not only on summarizing existing knowledge and showing the capabilities of the lattice fracture model; but also to fill in an important gap in the field of lattice modeling of concrete fracture; namely, to provide a recommendation for a systematic model calibration using experimental data. Through this research, numerical analyses are performed to fully understand the failure mechanisms of cementitious materials under various loading and boundary conditions. While the model presented herein does not aim to completely reproduce the load-displacement curves, and due to its simplicity results in relatively brittle post-peak behavior, possible solutions for this issue are also discussed in this work.

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Lattice Discrete Particle Modeling of concrete coupled creep and shrinkage behavior: A comprehensive calibration and validation study

Cited by 20 publications

References 60 publications

Gradient Nonlocal Enhanced Microprestress-Solidification Theory and Its Finite Element Implementation

Gradient Nonlocal Enhanced Microprestress-Solidification Theory and Its Finite Element Implementation

Coupled multi-physics simulation of chloride diffusion in saturated and unsaturated concrete

Lattice Fracture Model for Concrete Fracture Revisited: Calibration and Validation

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