A calculation method for the minimum thickness of a foam concrete distribution layer under blast load

YANG Ya; KONG Xiangzhen; FANG Qin; GAO Chu

doi:10.11883/bzycj-2023-0047

Volume 43 Issue 11

Nov. 2023

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YANG Ya, KONG Xiangzhen, FANG Qin, GAO Chu. A calculation method for the minimum thickness of a foam concrete distribution layer under blast load[J]. Explosion And Shock Waves, 2023, 43(11): 114201. doi: 10.11883/bzycj-2023-0047

Citation:

YANG Ya, KONG Xiangzhen, FANG Qin, GAO Chu. A calculation method for the minimum thickness of a foam concrete distribution layer under blast load[J]. Explosion And Shock Waves, 2023, 43(11): 114201. doi: 10.11883/bzycj-2023-0047

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A calculation method for the minimum thickness of a foam concrete distribution layer under blast load

doi: 10.11883/bzycj-2023-0047

State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Received Date: 2023-02-18
Rev Recd Date: 2023-07-13

Available Online: 2023-07-13

Publish Date: 2023-11-17

Abstract

Abstract

In order to study the design thickness of the foam concrete distribution layer under blast load, the numerical model of one-dimensional blast wave propagation in foam concrete was established based on the LS-DYNA software, which was verified by comparing it with the corresponding experimental data, and then the propagation and attenuation of the blast wave in the foam concrete bars with semi-infinite and finite thicknesses were analyzed in detail based on the simplified stress-strain curve of foam concrete. The numerical results demonstrate that the triangular-shaped blast load will be attenuated into a trapezoidal-shaped load with the same amplitude as the yield strength of foam concrete when its thickness is enough, while the so-called load enhancement effect will occur at the fixed end due to the action of the stronger reflected wave when its thickness is small. Based on the compaction of foam concrete, the foam concrete with sufficient length can be divided into five regions, i.e., the compaction zone 1, the plateau zone 1, the elastic zone, the plateau zone 2, and the compaction zone 2, where the range of the elastic zone is gradually shortened as the pole length decreases. To avoid the load enhancement effect and minimize the load on the protected structures, the minimum thickness of the distribution layer of foam concrete was defined corresponding to that when the elastic area and two plateau areas disappeared. The sensitivity analysis of blast load and density of foam concrete on the minimum thickness of foam concrete shows that for the blast load concerned, the minimum thickness increases with the peak and duration time of blast load, but is less affected by the rise time of blast load. Furthermore, the minimum thickness of low-density foam concrete is larger than that of high-density foam concrete under the same blast load. Based on the numerical results, a formula for minimum thickness was proposed.
- foam concrete,
- distribution layer,
- one-dimensional blast wave,
- minimum thickness

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References

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