Numerical study on dynamic response and spall damage  of filter concrete under impact load

LI Guoqiang; MA Gang; GAO Songtao; GUO Dongcai; ZHANG Jiayin

doi:10.11883/bzycj-2022-0189

Volume 43 Issue 2

Feb. 2023

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Article Navigation > Explosion And Shock Waves > 2023 > 43(2): 023201

LI Guoqiang, MA Gang, GAO Songtao, GUO Dongcai, ZHANG Jiayin. Numerical study on dynamic response and spall damage of filter concrete under impact load[J]. Explosion And Shock Waves, 2023, 43(2): 023201. doi: 10.11883/bzycj-2022-0189

Citation:

LI Guoqiang, MA Gang, GAO Songtao, GUO Dongcai, ZHANG Jiayin. Numerical study on dynamic response and spall damage of filter concrete under impact load[J]. Explosion And Shock Waves, 2023, 43(2): 023201. doi: 10.11883/bzycj-2022-0189

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Numerical study on dynamic response and spall damage of filter concrete under impact load

doi: 10.11883/bzycj-2022-0189

College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received Date: 2022-05-05
Rev Recd Date: 2022-08-14

Available Online: 2022-09-13

Publish Date: 2023-02-25

Abstract

Abstract

Based on the working mechanism of local resonance materials, a filter concrete with stress wave attenuation characteristics is designed by embedding metal balls wrapped with elastic layer (filter units) in the concrete matrix. First, the stress wave attenuation mechanism of filter concrete is analyzed by simplifying the filter concrete structure into a mass-spring mechanical system. Then, the propagation velocity and peak stress of stress wave in normal concrete model and filter concrete model under impact load are compared by using numerical simulation approach. Through parameter analysis, the influence of the density of metal ball, elastic modulus and thickness of elastic layer on the energy storage of filter units are studied. Finally, the spalling damage patterns of normal concrete model and filter concrete model under impact load are compared. The results show that the filter units can effectively reduce the stress wave propagation velocity and magnitude of peak stress in the concrete matrix. The vibration of the metal balls and the deformation of the elastic layer form a good energy storage mechanism for filter units and effectively reduce the energy exerted by the impact load on the concrete matrix. The larger the mass of the metal balls, the better the energy storage effect of the filter units, while the elastic modulus and thickness of the elastic layer need to be designed through a proper analysis to maximize the energy storage of the filter units. The concrete matrix around the elastic layer has obvious stress concentration and local damage may occur, but the local damage of the filter concrete matrix dissipates a large amount of energy produced by the load, effectively reducing the degree of destruction near the free surface of the structure. Combined with the attenuation effect of the filter units on the stress wave, the filter concrete has achieved good impact resistance.
- filter concrete,
- local resonance,
- spalling damage,
- stress wave,
- energy storage mechanism

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References

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