Mesoscale numerical simulation on dynamical response of concrete slabs to explosion loading

XU Liuyun; ZHANG Yuandi

doi:10.11883/bzycj-2022-0214

Volume 42 Issue 12

Dec. 2022

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XU Liuyun, ZHANG Yuandi. Mesoscale numerical simulation on dynamical response of concrete slabs to explosion loading[J]. Explosion And Shock Waves, 2022, 42(12): 123102. doi: 10.11883/bzycj-2022-0214

Citation:

XU Liuyun, ZHANG Yuandi. Mesoscale numerical simulation on dynamical response of concrete slabs to explosion loading[J]. Explosion And Shock Waves, 2022, 42(12): 123102. doi: 10.11883/bzycj-2022-0214

XU Liuyun, ZHANG Yuandi. Mesoscale numerical simulation on dynamical response of concrete slabs to explosion loading[J]. Explosion And Shock Waves, 2022, 42(12): 123102. doi: 10.11883/bzycj-2022-0214

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Mesoscale numerical simulation on dynamical response of concrete slabs to explosion loading

doi: 10.11883/bzycj-2022-0214

XU Liuyun^1
,,
ZHANG Yuandi²

1.
The 38th Research Institute, China Electronics Technology Group Corporation, Hefei 230088, Anhui, China
2.
Hefei General Machinery Research Institute Co., Ltd., Hefei 230031, Anhui, China

Received Date: 2022-05-16
Rev Recd Date: 2022-09-23

Available Online: 2022-09-23

Publish Date: 2022-12-08

Abstract

Abstract

In order to study the damage of concrete structures which have relatively strict requirements on the formation and propagation of cracks, such as dam, pier and nuclear power plant containment, suffered by impact loads, numerical studies were conducted on the mechanical response of (reinforced) concrete slabs under two types of explosion loadings (contact explosion and closed explosion) by a three-dimensional meso-mechanical model together with a comprehensive computational dynamic constitutive model for concrete material, followed by a parametric discussion about the interfering factors of final crack morphologies in concrete targets. To generate the three-dimensional meso-mechanical model, regular hexahedral meshes were firstly applied to whole concrete specimens/structures and all the elements were assigned as mortar matrix, then the assemblies of elements as aggregate were randomly selected and the outer surfaces of each aggregate element assemblies were covered with shell elements as interfacial transition zone layers. The three-dimensional meso-mechanical model, in which taking the influence of internal meso-structures of concrete (e.g. volume fraction, size and gradation of coarse aggregate) and mechanical properties of three phase materials into consideration, succeeds in accurately predicting the crack patterns and crater sizes in the concrete slabs subjected to the two types of explosion loadings. It is shown that the numerical results are in good agreement with the experimental observations in terms of crater shapes and sizes in the contact explosion, as well as the number of main cracks in the closed explosion when compared with the predictions by the macroscopic homogeneous models. Parametric studies performed for further study on the influence factors of the explosion results indicate that both the global mesh size of the model and the relative mesh size of each component in the model produce effects on the accuracy of the numerical results, the balance between the computational accuracy and efficiency can be achieved by setting a similar mesh size for concrete material with air grids. In addition, the influence of the aggregate size can not be neglected in the response and failure of the concrete slabs subjected to explosion loadings. The three-dimensional meso-mechanical model plays an important role in understanding the meso-mechanism and influencing factors of the response and failure of the concrete structures subjected to impact loadings, which is of great theoretical and practical significance for engineering design and safety assessment.
- concrete,
- meso-mechanical model,
- explosion loading,
- crack morphology,
- crater size,
- grid sensitivity

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References(23)

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