Abstract:
In today's progressively developing world, military needs practical, swiftly executed and economical solutions to meet the challenges of modern battlefields. One critical aspect of such challenges includes the establishment of military outposts, which serve as protective structure for various activities including defense and surveillance.
This study focuses on analyzing existing Military Bunker against the blast effects generated by modern operational weapon system and suggest new innovative smart materials to improve the structural performance. Numerical tool like Conwep is used for generating dynamic loadings and finite element software i.e LS-Dyna for analyzing and designing protective structure. Primarily, all material models including full scale model verification was performed. Later, comparison is drawn between dynamic blast loading curves obtained from ConWep and LS-Dyna. Finally, the Bunker structure is analyzed using conventional materials and novel materials such as Steel Fiber Reinforced Concrete (SFRC), Shape Memory Alloys (SMA) and military grade Poly-Urea sprays, against the amplified dynamic loading conditions.
According to results, ConWep gives blast loadings 2.88 times higher in magnitude than LS-Dyna. Baktar- Shikan model with conventional materials has displayed peak displacement of 34 mm at a critical time of 7 msec, whereas, mark improvement in strength has been observed after replacing conventional materials with innovative materials i.e maximum deflections has been reduced to 0.17 mm i.e 198%, as compared to deflection in normal strength concrete. Moreover, full-scale model has attained maximum peak value of 965313 kg. (mm/ msec)2, due to the addition of soil mass which has overburdening the structure thereby increasing the overall mass of the structure hence increasing the K.E. There is a 164% reduction in K.E with the replacement of SFRC to that of normal concrete. The addition of Poly-Urea has shown the reduction in K.E upto 57898 kg. (mm/msec)2.
