Assessment of structural wall stiffness impact due to blast load

Abstract

The objective of this research is to shed light on blast resistant building design, the enhancement of building security against the effects of explosives in the structural design process. Modelling and analysis are carried out in ETABS. Three different models are taken with different structural properties and their analyses are done by applying load at column beam joint (according to IS 4991–1968) when 300 kg TNT (explosive yield) is at 30 m standoff distance from the face of the building. Variation of storey displacement and storey drift is recorded when the stiffness of the structure is changed and a shear wall of 150 mm is provided at different faces concerning loading direction. Without infill structure, increase the number of column and beam by increasing the number of bays from 3 bays of 4 m to 6 bays of 2 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 are reduced by around 74%., and maximum storey drift reduced by around 72%. In without infill structure, provide 150 mm thick shear wall at two face perpendicular to the blast loading face without changing the yield of explosion and standoff distance, the maximum displacement and drift reduced drastically by around 97% and 96% respectively. In without infill structure, provide a 150 mm thick shear wall at two faces parallel to the blast loading face without changing the yield of explosion and standoff distance, the maximum displacement and drift reduced by around 11.13% and 10.80% respectively. Infill structure with 150 mm thick shear wall at all four faces without changing the yield of explosion and standoff distance, the maximum displacement and drift reduced by around 97.9% and around 97.86% respectively.