Numerical study of dynamic behavior of concrete by meso-scale particle element modeling

Qin, Chuan; Zhang, Chuhan

doi:10.1016/j.ijimpeng.2011.07.004

Cited by 63 publications

(24 citation statements)

References 32 publications

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“…A uni-axial loading test is often used to calibrate models for different materials. The influence of strain rate on behaviour and dynamic loading has also been investigated [19][20][21], including the impact of missiles on concrete beams studied in 2D [22]. Sawamoto [23] used a bonded particle model to examine the dynamic impact of deformable missiles on reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

A bond model for DEM simulation of cementitious materials and deformable structures

2014

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There is an increasing use of the discrete element method (DEM) to study cemented (e.g. concrete and rocks) and sintered particulate materials. The chief advantage of the DEM over continuum based techniques is that it does not make assumptions about how cracking and fragmentation initiate and propagate, since the DEM system is naturally discontinuous. The ability for the DEM to produce a realistic representation of a cemented granular material depends largely on the implementation of an inter-particle bonded contact model. This paper presents a new bonded contact model based on the Timoshenko beam theory which considers axial, shear and bending behaviour of the bond. The bond model was first verified by simulating both the bending and dynamic response of a simply supported beam. The loading response of a concrete cylinder was then investigated and compared with the Eurocode equation prediction. The results show significant potential for the new model to produce satisfactory predictions for cementitious materials. A unique feature of this model is that it can also be used to accurately represent many deformable structures such as frames and shells, so that both particles and structures or deformable boundaries can be described in the same DEM framework.

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Section: Introductionmentioning

confidence: 99%

A bond model for DEM simulation of cementitious materials and deformable structures

2014

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“…Although, the existence of genuine strain-rate effects have been suggested by meso-scale simulations and micro-crack models [28][29][30], the findings in this study show that structural effects have a significant contribution to the measured DIF, and therefore, one needs to be cautious about interpreting SHPB data for concrete-like materials. Otherwise, the material model with considering strain-rate effect based directly on SHPB measurement may overpredict material strength and lead to non-conservative design and assessment of protective structures.…”

Section: Conclusion and Remarksmentioning

confidence: 59%

Structural effects on compressive strength enhancement of concrete-like materials in a split Hopkinson pressure bar test

Flores‐Johnson

2017

International Journal of Impact Engineering

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Many researches have confirmed that the dynamic increase factor (DIF) of concretelike materials in compression measured by split Hopkinson pressure bar (SHPB) includes considerable structural effects, which do not belong to strain-rate effect. It has been found that the factors responsible for structural effects include material parameters (i.e. hydrostatic dependence, dilation parameter), specimen geometry (i.e. diameter), end interface friction and material inertia. However, their intrinsic relations have never been fully clarified. Based on two well-established material models (extended Drucker-Prager model in Abaqus and the Concrete Damage Model Release III in LS-DYNA), this paper uses numerical SHPB tests to investigate the interactive relations among these structural factors. It was found that the lateral confinement in a SHPB specimen is responsible for all structural effects in a SHPB test of concrete-like material. Two independent mechanisms can produce the lateral confinement, i.e. (i) friction on the interface of SHPB specimen and pressure bars, which prevents the expansion of the SHPB specimen during compression, and (ii) lateral inertia in SHPB specimen, which generates reactive radial confinement stress. Dilation can further enhance DIF, but it has to interact with either or both mechanisms. The ways that various structural factors contribute to structural effects through these mechanisms are clarified.

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“…The proposed model adopts a previously developed meso-scale model by PEM for three-phase concrete, i.e., aggregate, mortar, and interface [16]. A pre-process scheme for generation of the specimen of multiphase concrete and an inverse method for determination of the meso-mechanical parameters are briefly introduced below.…”

Section: Pre-process Approach and Inverse Methods For Meso-scale Concrmentioning

confidence: 99%

“…The relationship between meso-and macro-mechanical parameters has been discussed in [15,16]. Correlation analysis is found to be satisfactory between the stiffness in meso modeling and the elastic modulus in macroscale, while the proportion of shear and normal stiffnesses is found to be related to the Passion ratio.…”

Section: Pre-process Approach and Inverse Methods For Meso-scale Concrmentioning

confidence: 99%

“…Meso-scale models have recently been adopted for extensive studies but with a main focus on static load simulation. The particle element method (PEM) has been proven to be a powerful tool for explaining the fracture mechanisms of pseudobrittle material [15] and has thus been adopted in the dynamic meso-scale model of concrete for tensile and compressive simulations [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Determining the impact behavior of concrete beams through experimental testing and meso-scale simulation: II. Particle element simulation and comparison

Ming-xin

Zhang

Chen

2015

Engineering Fracture Mechanics

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Numerical study of dynamic behavior of concrete by meso-scale particle element modeling

Cited by 63 publications

References 32 publications

A bond model for DEM simulation of cementitious materials and deformable structures

A bond model for DEM simulation of cementitious materials and deformable structures

Structural effects on compressive strength enhancement of concrete-like materials in a split Hopkinson pressure bar test

Determining the impact behavior of concrete beams through experimental testing and meso-scale simulation: II. Particle element simulation and comparison

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