Political rivalry among aspiring groups for power to rule turns the society hostile with trust deficit tends to instability and poor governance. Disgruntled groups take subversion as a tool to show their worth, and target government building infrastructures using explosives. Accidental explosions too damage the structures. Recent Beirut explosion of ammonium nitrate at the seaport is an example of an accidental large-scale explosion. Also, in the current prevailing political scenario, the need for blast-resistant shelter cannot be completely ruled out. With this concern, the double-roof on-ground RCC shelter, designed and tested by the Terminal Ballistics Research Laboratory, Ministry of Defence, Chandigarh, India, under the explosive loads of 10 and 30kg-TNT in free-air has been numerically analyzed in this study using the commercial FEM-based software program, ABAQUS/CAE version 6.14 equipped with concrete-damaged plasticity model. RCC Hume pipes with 25 mm thickness of 200 mm diameter spaced between the two roofs of the shelter act as energy absorption layer (EAL). The available test results and finite element analysis predictions, including maximum displacement and damage to the shelter, are presented and compared. The computed results are found in reasonable agreement with the experimental ones. To improve the shelter response, analysis has been extended replacing the EAL of the Hume pipes with the carbon-steel (CS) seamless pipes of grade Fe330 between the roofs of the shelter. The role of the RCC Hume pipes for dissipating the energy and the replaced CS pipes between the two roofs of the shelter is highlighted.
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Anas, S.M., Alam, M. & Umair, M. Performance of on-ground double-roof RCC shelter with energy absorption layers under close-in air-blast loading. Asian J Civ Eng (2021). https://doi.org/10.1007/s42107-021-00395-8
- Reinforced cement concrete (RCC)
- Blast shelter
- Blast loading
- Hume pipes
- Carbon steel (CS) pipes
- Concrete-damaged plasticity (CDP) model
- Damage dissipation energy