Monte Carlo simulations of meso-scale dynamic compressive behavior of concrete based on X-ray computed tomography images

The results of an experimental program on eight short reinforced concrete columns having different structural sizes and axial compression ratios subjected to monotonic/cyclic lateral loading were reported. A 3D mesoscopic simulation method for the analysis of mechanical properties of reinforced concrete members was established, and then it was utilized as an important supplement and extension of the traditional experimental method. Lots of numerical trials, based on the restricted experimental results and the proposed 3D mesoscopic simulation method, were carried out to sufficiently evaluate the seismic performances of short reinforced concrete columns with different structural sizes and axial compression ratios. The test results indicate that (1) the failure pattern of reinforced concrete columns can be significantly affected by the shear-span ratio; (2) increasing the axial compression ratio could improve the load capacity of the reinforced concrete column, but the deformation capacity would be restricted and the failure mode would be more brittle, consequently the energy dissipation capacity could be deteriorated; and (3) the load capacity, the displacement ductility, and the energy dissipation capacity of the short reinforced concrete columns all exhibit clear size effect, namely, the size effect could significantly affect the seismic behavior of reinforced concrete columns.

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“…These treatments are similar with those in Du et al. (2013), Genikomsou and Polak (2015), Huang et al. (2016), and Jin et al.…”

Section: Experimental and Numerical Setupsupporting

confidence: 75%

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

Jin

Zhang

et al. 2017

International Journal of Damage Mechanics

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“…Deficient reliable experimental data, accordingly, result in the mechanical behavior of ITZ still being not understood well. Generally, in virtue of similar structural characteristics, the property parameters of ITZ is always treated by multiplying that of mortar with a coefficient (less than 1) [43]. Grote et al [44] and Park et al [45] have found that the dynamic mechanical behavior of the mortar matrix is similar to that of concrete.…”

Section: Constitutive Models and Mechanical Parametersmentioning

confidence: 99%

“…Young's modulus and Poisson's ratio of aggregates were taken from [47]. 75% of the mechanical parameters of mortar was applied to ITZs as suggested by Huang et al [43]. The Poisson's ratio ν of mortar matrix and ITZ is 0.2, the same as that in [48].…”

Section: Constitutive Models and Mechanical Parametersmentioning

confidence: 99%

“…The data with superscript "a" are obtained by repeated numerical trial; data with superscript "b" are obtained from [49]; data with "c" are calculated according to [43]; data with "d" are quoted from [47]; those with "e" are taken from [48] Material to the closest result was adopted (the data with superscript "a" as listed in Table 1). The comparison among the compressive stress-strain curves of concrete with different strengths of mortar is presented in Fig.…”

Section: Constitutive Models and Mechanical Parametersmentioning

confidence: 99%

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Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis

Jin

Lan

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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The concrete structures under impact loading duress may be destroyed within an extremely short period of time. The importance and complexity of exploration on the impact resistance of concrete members make this area still open for discussion. In the present study, a 3-D mesoscale numerical model was established to investigate the effect of the combination of impact mass and velocity on the mechanical behavior of reinforced concrete (RC) beams subjected to impact loadings. Heterogeneity of concrete and strain rate effects of concrete and steel bars were taken into account. Furthermore, nonlinear interaction between the concrete and steel bars was considered herein. Results from macroscale and mesoscale simulation were compared with the available physical tests, indicating that the mesoscale numerical model can better represent the influence of heterogeneity of concrete on the mechanical behavior of RC beams. Five different impact energy levels were involved to study the effect of the combination of impact mass and velocity on the impact resistance of RC beams. At last, the residual bearing capacity and natural frequency of impacted RC beams were numerically calculated and their relationship was discussed. It is indicated that the deformation of RC beams is influenced strongly by the impulse, which increases with the increasing impact mass at identical impact energy. Besides, the failure mode of RC beams turns from shear-dominant failure mode to bending shear failure mode with the increase of impact mass, accompanied by the increase of energy dissipation of steel bars and the whole member. Despite this, in the present work, the combination of the impact mass and velocity had little influence on the damage extent (based on the performance) of the RC beams. Moreover, an empirical relationship between the residual bearing capacity and the natural frequency of the impacted RC beams was established as a rough reference for damage evaluation in engineering practice.

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“…The advent of modern computer machines led to the development of sophisticated computer techniques that admit the statistical computational design of heterogeneous composite materials [57], the improvement of nanoscale techniques to study the phenomenological behavior of nanocomposite materials [10], the explicit simulation of the interface between dissimilar materials [9,37], as well as the internal structure of the material by considering the presence of aggregates, mortar, ITZs, as well as the voids and weak inclusions [11,19,55]. Such tools provide a better understanding of the concrete physical behavior.…”

Section: Introductionmentioning

confidence: 99%

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

Gimenes

Rodrigues

Maedo

et al. 2020

Multiscale Sci. Eng.

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In this work a concurrent multiscale (macro and mesoscale) approach for high-strength concrete (HSC) is proposed for seeking to better understand the influence of coarse aggregate type, shape, and size distribution as well as the interfacial transition zone (ITZ) effects on the fracture mechanical responses. A linear elastic model with homogenized elastic properties is used for the macroscale, while a three-phase material composed of coarse aggregates, mortar matrix and the ITZ equipped with nonlinear behavior models are assumed for the mesoscopic level. To geometrically represent and gain insights into effects of coarse aggregates, two polygonal shapes are assumed: irregular quadrilateral and regular octagonal forms, which are used separated and randomly generated from a given grading curve and placed in the mesoscale region using the "take-and-place" method. A mesh fragmentation technique is used to explicitly represent the crack propagation process by considering the individual behavior of each phase as well as their mutual interactions. The non-matching macro and mesoscopic meshes are attached based on the use of coupling finite elements in the context of the rigid coupling scheme to adequately guarantee the continuity of displacement between both scales. Numerical analyses of dog-bone shape specimens under tensile load and three-point bending beams were performed. The responses obtained numerically show a good agreement with experimental ones found in literature demonstrating how the proposed approach is efficient, robust and useful for modeling crack propagation in HSC.

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Monte Carlo simulations of meso-scale dynamic compressive behavior of concrete based on X-ray computed tomography images

Cited by 163 publications

References 52 publications

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

A combined experimental and numerical analysis on the seismic behavior of short reinforced concrete columns with different structural sizes and axial compression ratios

Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

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