Computers and Concrete

Techno-Press (테크노프레스)
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Numerical study on RC and HPFRCC slabs exposed to TNT explosion near ground

  • MinJoo Lee (Department of Civil and Environmental Engineering, KAIST) ;
  • Hyo-Gyoung Kwak (Department of Civil and Environmental Engineering, KAIST) ;
  • Sung-Wook Kim (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Gang-Kyu Park (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2023.03.27
  • Accepted : 2023.05.25
  • Published : 2023.06.25
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Abstract

In this paper, the structural performance of RC and HPFRCC slabs exposed to a TNT explosion were numerically investigated. A finite element model was established using the MM-ALE method in the LS-DYNA program to simulate a near-ground TNT explosion at a scaled distance of 1.08 m/kg3. The K&C model was calibrated to exactly reflect the material properties of HPFRCCs that were developed in KICT and KNU. Numerical and experimental results were compared for the damage distribution and failure shape of the slabs. Based on the verified numerical model, a parametric study was carried out to demonstrate the effects of compressive strength and thickness of the slab on the blast resistance. In particular, the spallation failure on the back side of the slab is greatly dependent on the thickness. Finally, additional numerical simulations were conducted to explore the variation in blast pressure characteristics according to the scaled distance and explosive shape. It was confirmed that the pressure induced by cubic TNT was more destructive to the slab than cylindrical and spherical TNT in a nearfield explosion.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2021R1A6A3A01088355) and was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2023R1A2C2005101).

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