Impact of blast loading over reinforced concrete without infill structure

Abstract In recent times, the number of terrorist attacks has increased, and shown the impact of blast loads on buildings is a matter of concern that should be considered in the design process. The purpose of this research is to investigate the effect of blast loading applied over the structure. In ETAB Software, an R.C.C. framed Structure with G + 3 number of stories is designed with each storey height is 3.5 m and plinth level is 1.5 m total height of a building is 14 m, and length and width of the building is 12 m each. The size of the beam and column is 300 × 400 mm and 450x450 mm, respectively. Loads applied over the structure are live load (3 KN/m2), floor finish load (1 KN/m2), and blast load (150 kg and 300 kg TNT) at standoff distance 30 m and 60 m. The grade of concrete and steel is M30 and fe500, respectively. Four different models are taken, and the variation of storey displacement and storey drift is recorded when the standoff distance, the amount of blast yield (TNT), and the stiffness of the structure change. Without infill structure, when standoff distance is increased from 30 m to 60 m without changing the yield of explosion, the maximum storey displacement is reduced by around 67%. Whole storey drift is reduced by around 66.70%. Without infill structure, when the yield of an explosion is reduced from 300 kg TNT to 150 kg TNT without changing the standoff distance, the maximum storey displacement is reduced by around 33%., and whole storey drift is reduced by around 31%. Without infill structure, we increase the number of columns and beams by increasing the number of bays from 3 bays of 4 m to 4 bays of 3 m each in both X and Y direction without changing the size of the column and beam. The yield of explosion and standoff distance does not change, then the maximum storey displacement is reduced by around 40%., and whole storey drift is reduced by around 38%.