Air blast effects on concrete walls
The effects of airblast due to explosive detonation in close proximity of a concrete wall are investigated analytically. Estimates are obtained both for the spalling of the back-face of the concrete wall and for the overall wall response produced by the total impulsive load of the air blast. Assuming elastic wave propagation in the concrete wall, it is found that as spall thickness increases the spall velocity decreases. This holds for normal as well as oblique wave incidence on the back-face of the wall. Therefore, for debris which has significant mass, the ejection velocity produced by spalling action alone is quite moderate. Plastic yield-line analysis of the wall segment subjected to the impulsive loading of the air blast indicates that for sufficiently large explosions substantial displacements and peak velocities can occur in typical shield walls. Thus for close-in explosions severe wall damage and/or breaching should be expected. Also coupling between spallation and the gross wall motion is possible. This occurs when debris produced by spalling action is ejected at high velocities by the rapid wall motion.
- Research Organization:
- Argonne National Lab., Ill. (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7326692
- Report Number(s):
- ANL-CT-76-50; TRN: 77-002413
- Country of Publication:
- United States
- Language:
- English
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