Punching shear resistance of concrete slabs using mode-II fracture energy

Kumar, Ch. Naga Satish; Rao, T. D. Gunneswara

doi:10.1016/j.engfracmech.2012.01.004

Cited by 18 publications

(2 citation statements)

References 7 publications

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“…Since the model is two-dimensional, the out-of-plane shear failure mode will not happen, and the fracture energy in mode III is not taken into account. Different types of concrete shear experiments have shown that the mode II fracture energy of concrete is about 20 to 25 times larger than mode I fracture energy [22,38,39]. The findings are used in the present research.…”

Section: Interfacial Transitional Zones (Itzs) and Mortar Internal Inmentioning

confidence: 80%

Meso-Scale Simulation of Concrete Based on Fracture and Interaction Behavior

Xiong

Xiao

2019

Applied Sciences

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Based on the cohesive zone model, a meso-scale model is developed for numerical studies of three-phase concrete under tension and compression. The model is characterized by adopting mixed-mode fracture and interaction behavior to describe fracture, friction and collision in tension and compression processes. The simulation results match satisfactorily with the experimental results in both mechanical characteristics and failure mode. Whole deformation and crack propagation process analyses are conducted to reveal damage evolution of concrete. The analyses also set a foundation for the following parametric studies in which mode II fracture energy, material parameter, frictional angle and aggregates’ mechanical characteristics are considered as variables. It shows that the mixed-mode fracture accounts for a considerable proportion, even in tension failure. Under compression, the frictional stress can constrain crack propagation at the beginning of the damage and reestablish loading path during the softening stage. Aggregates’ mechanical characteristics mainly affect concrete’s performance in the mid-and-late softening stage.

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Section: Interfacial Transitional Zones (Itzs) and Mortar Internal Inmentioning

confidence: 80%

Meso-Scale Simulation of Concrete Based on Fracture and Interaction Behavior

Xiong

Xiao

2019

Applied Sciences

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“…For parameters of ITZs and CIEs, there are different settings in different studies. Some previously research consider the mode II fracture energy is about 20 to 25 times larger than mode I fracture energy [ 17 , 41 ]. However, in other studies, the shear fracture properties were assumed to be the same as the normal ones [ 29 , 34 ].…”

Section: Simulation Programmentioning

confidence: 99%

Fracture Behaviour of Real Coarse Aggregate Distributed Concrete under Uniaxial Compressive Load Based on Cohesive Zone Model

Ying

Guo

2021

Materials

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Two-dimensional meso-scale finite element models with real aggregates are developed using images obtained by digital image processing to simulate crack propagation processes in concrete under uniaxial compression loading. The finite element model is regarded as a three-phase composite material composed of aggregate, mortar matrix and interface transition zone (ITZ). Cohesive elements with traction–separation laws are used to simulate complex nonlinear fracture. During the experiment, digital image correlation (DIC) was used to obtain the deformation and cracks of the specimens at different loading stages. The concept of strain ratio is proposed to describe the effectiveness of simulation. Results show that the numerical strain ratio curve and stress–strain curves are both in good agreement with experimental data. The consistency between the cracks obtained by simulation and those obtained by DIC shows the good performance of cohesive elements as well as the effectiveness of simulation. In summary, the model is able to provide accurate predictions of the whole fracture process in concrete under uniaxial compression loading.

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