Transient Effect of Blast Loads on RCC BuildingAuthor : Rishabh Joshi and P. R. Maiti
Volume 8 No.1 January-June 2019 pp 9-19
The increase in the number of terrorist attacks has shown that the effect of blast loading on structures is a serious matter that should be taken into consideration in the design process. The blast pressure on the structure due to nearby explosion is of very high magnitude and very short duration. Such an impulsive loading requires dynamic time-history analysis. This paper describes the nature of explosion of explosive materials and dynamic pressure developed on the nearby structure in lieu of explosion. Initially, efforts have been made to determine the effect of 1000 kg of C4 explosive material as an equivalent weight of TNT on different surfaces of a building model at a stand-off distance of 22.5m. The intensity of blast load on each surface is analytically determined as a record of pressure time history. Further attempts have been made to determine the effect of distance of blast for the same explosive material on building surfaces at stand-off distance of 10m, 18.5m, 22.5m and 27m. The effect of different explosives, i.e., TNT, C4, RDX and PETN on building surfaces at constant stand-off distance of 22.5m has also been determined. From the analysis, it is observed that the effect of blast load on front and rear surface of the building is critical. For close range explosions, deformations on front surface are more but with increase in stand-off distance, maximum deformations occur in roof surface.
Blast Loads, Pressure-Time History, TNT, Stand-Off Distance, Heat of Detonation, Surface Bursts
 H. Draganic, and V. Sigmund, “Blast Loading on Structures”, Vol. 1, No. 4, pp. 1330-3651, July 2012.
 V. Karlos, and G. Solomos, “Calculation of Blast Loads for Application to Structural Components”, European Commission, Joint Research Centre, Institute for the Protection and Security of the Citizen, 2013.
 T. Ngo, P. Mendis, A. Gupta and J. Ramsay, “Blast Loading and Blast Effects on Structures”, EJSE Special Issue: Loading on Structures, 2007.
 M. Priyanka, and N. Munirudrappa, “Blast Loading and its Effects on Structures”, PG Dissertaion, DayanandaSagar College of Engineering, K.S. Layout, Bengaluru, 2013.
 H. L. Brode, “Numerical solution of spherical blast waves”, Journal of Applied Physics., American Institute of Physics, New York, 1955.
 N. M. Newmark, R. J. Hansen, “Design of blast resistant structures”, Shock and Vibration Handbook., Vol. 3, Eds. Harris &Crede, McGraw-Hill, New York, 1961.
 C. A. Mills, “The design of concrete structures to resist explosions and weapon effects”, Proceedings of the 1st Int. Conference on concrete for hazard protections, Edinburgh, UK, 1987.
 A. Goyal, “Blast Resistant Design: Critical issues”, Proceedings of the sixth structural engineering convection, IPXI, pp. 1-10, Dec 2008.
 P. Esper, “Investigation of damage to buildings under blast loading and recommended protection measures”, 9th International Structural Engineering Conference, Abu Dhabi, November 2003.
 Q. Kashif, M. B. Varma, “Effect of Blast on G+4 RCC frame structure”, Intl. Journal of Emerging Technology and Advanced Engineering, Vol. 4, No. 11, pp. 2250-2459, Nov 2014.
 X. Cheng, W. Jing, and Jiexuan, “Dynamic Response of Concrete Frame Structure under a Blasting Demolition Environment”, School Of Civil Engineering, Lanzhou University of Technology, EJGE, Vol. 19, Lanzhou, China, 2014.
 U. Jamakhandi, and S. B. Vanakudre, “Design and Analysis of Blast Load on Structures”, International Research Journal of Engineering and Technology, Vol. 2, No. 7, pp. 2395-0072, October 2015.