Lattice Discrete Particle Modeling for Coupled Concrete Creep and Shrinkage Using the Solidification Microprestress Theory

Abdellatef, Mohammed; Alnaggar, Mohammed; Boumakis, Ioannis; Cusatis, Gianluca; Luzio, Giovanni Di; Wendner, Roman

doi:10.1061/9780784479346.022

Cited by 20 publications

(3 citation statements)

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“…The solution of the coupled system of equations yields the basic physical and chemical quantities, namely hydration degree, humidity rate, and temperature rate, which drive thermal strains, hygral shrinkage and determine the evolution of material properties as well as the kinetics of concrete creep. The coupling between mechanical response and physical/ chemical processes of concrete at early age has already been used in some recent applications [24,25,26,27,28].…”

Section: Review Of Constitutive Modeling Frameworkmentioning

confidence: 99%

Discrete element framework for modeling tertiary creep of concrete in tension and compression

Boumakis

Luzio

Marcon

et al. 2018

Engineering Fracture Mechanics

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In this contribution, a computational framework for the analysis of tertiary concrete creep is presented, combining a discrete element framework with linear visco-elasticity and rate-dependency of crack opening. The well-established Lattice Discrete Particle Model (LDPM) serves as constitutive model. Aging visco-elasticity is implemented based on the Micro-Prestress-Solidification (MPS) theory, linking the mechanical response to the underlying physical and chemical processes of hydration, heat transfer and moisture transport through a multi-physics approach. The numerical framework is calibrated on literature data, which include tensile and compressive creep tests, and tests at various loading rates. Afterwards, the framework is validated on time-to-failure tests, both for flexure and compression. It is shown that the numerical framework is capable of predicting the time-dependent evolution of concrete creep deformations in the primary, secondary but also tertiary domains, including very accurate estimates of times to failure. Finally, a predictive numerical study on the time-to-failure response is presented for load levels that can not be experimentally tested, showing a deviation from the simple linear trend that is

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Section: Review Of Constitutive Modeling Frameworkmentioning

confidence: 99%

Discrete element framework for modeling tertiary creep of concrete in tension and compression

Boumakis

Luzio

Marcon

et al. 2018

Engineering Fracture Mechanics

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“…The mimicked heterogeneity allows the localization of damage in the area of the largest incompatible strains and, hence, stresses. In the case of deterioration processes, the same feature ensures the development of damage as a result of local volumetric expansion, e.g., due to thermal expansion, creep and hygral shrinkage [ 19 ], or the gel formation as a result of the alkali-silica-reaction [ 20 ]. The development of a predictive life-time model for bonded anchors, also accounting for the evolution of material properties due to ongoing hydration (see [ 21 ]), benefits from these general features of LDPM.…”

Section: Introductionmentioning

confidence: 99%

Modeling Adhesive Anchors in a Discrete Element Framework

2017

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In recent years, post-installed anchors are widely used to connect structural members and to fix appliances to load-bearing elements. A bonded anchor typically denotes a threaded bar placed into a borehole filled with adhesive mortar. The high complexity of the problem, owing to the multiple materials and failure mechanisms involved, requires a numerical support for the experimental investigation. A reliable model able to reproduce a system’s short-term behavior is needed before the development of a more complex framework for the subsequent investigation of the lifetime of fasteners subjected to various deterioration processes can commence. The focus of this contribution is the development and validation of such a model for bonded anchors under pure tension load. Compression, modulus, fracture and splitting tests are performed on standard concrete specimens. These serve for the calibration and validation of the concrete constitutive model. The behavior of the adhesive mortar layer is modeled with a stress-slip law, calibrated on a set of confined pull-out tests. The model validation is performed on tests with different configurations comparing load-displacement curves, crack patterns and concrete cone shapes. A model sensitivity analysis and the evaluation of the bond stress and slippage along the anchor complete the study.

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“…The link between the HTC model and the mechanical constitutive equations are represented by a set of aging equations. This framework for the chemo-mechanical coupling is at the center of this investigation, for more see at [3,4]. The mechanical behavior is captured by the Lattice Discrete Particle Model (LDPM) [5,6], a well established constitutive model that is formulated in the framework of discrete elements.…”

Section: Introductionmentioning

confidence: 99%

Age-Dependent Lattice Discrete Particle Model for Quasi-Static Simulations

Wendner¹,

Ninčević²,

Boumakis³

et al. 2016

KEM

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For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simulations utilizing and coupling a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects for concretes at various early ages. The HTC component of the computational framework allows taking into account any form of environmental curing conditions as well as known material constituents and predicts the level of concrete maturity. Mechanical response and damage are captured by the well-established LDPM, which is formulated in the framework of discrete meso-scale constitutive models. The chemo-mechanical coupling is accomplished by a set of aging functions that link the meso-scale material properties to an effective aging degree, accounting for cement hydration, silica fume reaction, polymerization, and temperature effects. After introducing the formulations the framework is applied to experimental data of 3 standard low and higher strength concretes. Investigated tests include two types of unconfined compression, Brazilian splitting, three-point-bending, and wedge splitting. Following the model calibration the framework is validated by purely predictive simulations of structural level experimental data obtained at different ages for the same concretes.

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Lattice Discrete Particle Modeling for Coupled Concrete Creep and Shrinkage Using the Solidification Microprestress Theory

Cited by 20 publications

References 0 publications

Discrete element framework for modeling tertiary creep of concrete in tension and compression

Discrete element framework for modeling tertiary creep of concrete in tension and compression

Modeling Adhesive Anchors in a Discrete Element Framework

Age-Dependent Lattice Discrete Particle Model for Quasi-Static Simulations

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