Lattice Discrete Particle Modeling of Concrete under Compressive Loading: Multiscale Experimental Approach for Parameter Determination

Fascetti, Alessandro; Bolander, John E.; Nisticò, Nicola

doi:10.1061/(asce)em.1943-7889.0001480

Cited by 26 publications

(8 citation statements)

References 28 publications

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“…The values of these parameters for the particular concrete are taken from experiments and trial and error procedures. The developed formalism makes it possible to effectively take into account the accumulation of low-scale damages, explicitly model mesoscopic fracture through breaking the bond (springs) between adjacent particles, and implement the strain rate dependence of crack cohesion [ 54 , 55 ]. Note that an alternative dynamic fracture model based on the concept of kinetic strength theory was also implemented within the spring network formalism [ 56 ].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Shilko

Konovalenko

2021

Materials

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It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1 < ε˙ < 100 s−1) is also characterized by the presence of a peculiar mechanism of interstitial water effect on the concrete fracture and compressive strength. Using computer simulations, we have shown that such a mechanism is the competition of two oppositely directed processes: deformation of the pore space, which leads to an increase in pore pressure; and pore fluid flow. The balance of these processes can be effectively characterized by the Darcy number, which generalizes the notion of strain rate to fluid-saturated material. We have found that the dependence of the compressive strength of high-strength concrete on the Darcy number is a decreasing sigmoid function. The parameters of this function are determined by both low-scale (capillary) and large-scale (microscopic) pore subsystems in a concrete matrix. The capillary pore network determines the phenomenon of strain-rate sensitivity of fluid-saturated concrete and logistic form of the dependence of compressive strength on strain rate. Microporosity controls the actual boundary of the quasi-static loading regime for fluid-saturated samples and determines localized fracture patterns. The results of the study are relevant to the design of special-purpose concretes, as well as the assessment of the limits of safe impacts on concrete structural elements.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Shilko

Konovalenko

2021

Materials

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“…Successive developments for this method can be found in the literature [12][13][14][15][16][17][18][19][20]. In general, three categories of the lattice model can be distinguished [14][15][16][17][18][21][22][23][24][25][26][27]:…”

Section: Introductionmentioning

confidence: 99%

“…(2) The lattice discrete particle model (LDPM), developed by Cusatis et al [14,15,22], is a synthesis of the confinement shear model and discrete particle model. This model simulates the fracture process by modeling the mechanical interaction of adjacent coarse aggregate pieces; it can explicitly represent a coarser fraction of aggregate in large structural applications.…”

Section: Introductionmentioning

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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“…The behavior of highly confined concrete is of great significance to engineering issues, including microstructure and mechanical properties, the material design of the anchorage of pre-stressing reinforcement, containment vessels, bridge pillars, and columns in high-rise buildings; and the behavior of individual, unique concrete structures exposed to projectile impact. Here we focus on compressive strength under high levels of confinement and evaluate the pore collapse and material compaction parameters for the Lattice Discrete Particle Model (LDPM), in contrast to the work of [1] which used an experimental method to evaluate these same parameters. In the three decades since the pioneering work of Balmer [2], much research has been devoted to the study of the confined behavior of concrete [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluating compressive mechanical LDPM parameters based on an upscaled multiscale approach

Sherzer

Schlangen

et al. 2020

Construction and Building Materials

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We propose an upscaled methodology for evaluating the compressive parameters of the Lattice Discrete Particle Model (LDPM) for a multiscale analysis of concrete structures. This methodology is based on mechanical and chemical models on a wide range of concrete scales. We show that the compressive mechanical parameters are related mainly to material compaction that occurs at the scale of cement paste, the scale containing porosity properties. Therefore, these compressive LDPM parameters are subsequently evaluated based on chemical and mechanical simulations at the cement paste level. Finally, the suggested methodology was verified and validated.

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Lattice Discrete Particle Modeling of Concrete under Compressive Loading: Multiscale Experimental Approach for Parameter Determination

Cited by 26 publications

References 28 publications

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Lattice Fracture Model for Concrete Fracture Revisited: Calibration and Validation

Evaluating compressive mechanical LDPM parameters based on an upscaled multiscale approach

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