Analysis on dynamic compressive behavior of concrete based on a 3D mesoscale model

ZHANG Xiangru; CHENG Yuehua; WU Hao

doi:10.11883/bzycj-2022-0541

Volume 44 Issue 2

Feb. 2024

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ZHANG Xiangru, CHENG Yuehua, WU Hao. Analysis on dynamic compressive behavior of concrete based on a 3D mesoscale model[J]. Explosion And Shock Waves, 2024, 44(2): 023102. doi: 10.11883/bzycj-2022-0541

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ZHANG Xiangru, CHENG Yuehua, WU Hao. Analysis on dynamic compressive behavior of concrete based on a 3D mesoscale model[J]. Explosion And Shock Waves, 2024, 44(2): 023102. doi: 10.11883/bzycj-2022-0541

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Analysis on dynamic compressive behavior of concrete based on a 3D mesoscale model

doi: 10.11883/bzycj-2022-0541

College of Civil Engineering, Tongji University, Shanghai 200092, China

Received Date: 2022-12-01
Rev Recd Date: 2023-04-17

Available Online: 2023-04-26

Publish Date: 2024-02-06

Abstract

Abstract

As the most widely used construction material, concrete is common in military protection and civil transportation infrastructures. During its services life, concrete may bear dynamic loads such as high-speed penetration, blast and impact of vehicle, ship, rockfall and so on. On the mesoscale, concrete is three-phase material composed of mortar, coarse aggregates and interface transition zone (ITZ). The concrete 3D mesoscale model was established to analyze the crack generation and development, damage evolution, dynamic strength and its influencing factors of concrete. Firstly, randomly distributed convex polyhedron aggregates of random shapes and sizes were modeled based on the conventional “take-and-place” method and Monte Carlo algorithm, and drop of aggregates under gravity were simulated in finite element software LS-DYNA to make aggregates more dense, improving aggregate volume fraction to 50%. After that, aggregate size was reduced by a trial value to control aggregate volume fraction conveniently. Then, aggregates and mortar were meshed with tetrahedral elements to display their actual physical shapes. Besides, ITZ was represented by interface cohesive contact which equals zero-thickness bonding elements to improve computational efficiency. Furthermore, SHPB simulations of different coarse aggregates sizes concrete were conducted and the accuracy of finite element model, parameter determination method and numerical simulation methods were proved by comparing test and simulated bar strain-time history, dynamic stress-strain curves and failure patterns of specimens. Finally, influences of the aggregate size (4−8, 10−14 and 22−26 mm), volume fraction (20%, 30% and 40%) and type (limestone, granite and basalt) on concrete dynamic compressive strength under the strain rate within 30−100 s⁻¹ were analyzed. It shows that the dynamic compressive strength of concrete increases first and then decreases with the increase of aggregate size; the dynamic compressive strength of concrete increases with the increase of volume fraction; the dynamic compressive strength of concrete increases with the increase of aggregate strength.
- concrete,
- 3D mesoscale model,
- dynamic mechanical behavior,
- cohesive contact,
- strain rate effect

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References(33)

References

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