Structural Engineering and Mechanics

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Effects of unconfined blast on strategic structures and its protective measures

  • Choubey, Bishwajeet (CCE R&D South, Defence (R&D) Organization) ;
  • Dutta, Sekhar C. (Department of Civil Engineering, IIT (ISM) Dhanbad) ;
  • Hussain, Md. Ahsaan (Department of Civil Engineering, IIT (ISM) Dhanbad)
  • Received : 2022.04.06
  • Accepted : 2022.07.29
  • Published : 2022.10.25
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Abstract

A strategic structure when exposed to direct hit of conventional bomb/projectile are severely damaged because of large amounts of energy released by the impact and penetration of bomb. When massive concrete slabs suffer a direct hit, the energy released during impact and penetration process are able to easily break up large mass of concrete. When over stressed under such impact of bombs, the concrete structure fails showing brittle behavioural nature. This paper is intended to study and suggest the protective measures for structures used for strategic application by adopting a means to dissipate the large quantum of energy released. To quantitatively evaluate the force, displacement and energy in such scenario, a fine numerical model of the proposed layered structure of different combinations was built in ANSYS programme in which tri-nitrotoluene (TNT) explosive was detonated at penetration depth calculated for GP1000 Lbs bomb. The distinct blast mitigation effect of the proposed structure was demonstrated by adopting various layers/barriers created as protective measures for the strategic structure. The calculated result shows that the blast effect on the structure is potentially reduced due to provision of buster slab with sand cushioning provided as protective measure to the main structure. This concept of layered protective measures may be adopted for safeguarding strategic structures such as Domes, Tunnels and Underground Structures.

Keywords

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