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Effect of Sequential blast loading on steel structure

Publication Date : 10/07/2015

Author(s) :

S. V. Totekar , S. N. Madhekar.

Conference Name :
4th International Conference on Recent Trends in Engineering & Technology(ICRTET-2015) July 2-4,2015 Organized by SNJB's KBJ College of Engineering,Chandwad,Nashik,Maharashtra,India

Abstract :

Blast analysis is gaining importance as terrorist activities are increasing all around with more devastating tools and techniques. The September 11, 2001 attack on World Trade Centre towers in New York, Murrah Federal Office Building in Oklahoma City on 19 1995.showed different strategies used by terrorist for destruction. Blast activity comes with many folds i.e. pressure, fire, ground shock, fragments with massive energy associated with it; which proves hazardous to structure or facilities in turn a Because of these, there is need to understand and provide protecting system for structure to resist blast. An advance numerical technique helps in stimulating explosive events which enable to understand effect and behavior of structure. Material behavior under impact load needs to be considered as under high stain rate strength increases compared to static loading conditions. In the present study, the four storied steel structure is designed using conventional method analyzed for progressive collapse on removal of ground floor columns is subjected to different blast scenarios. The structure designed to resist progressive collapse is subjected to single blast load on the front façade in one case while in second case same charge weight and standoff distance but different location of blast altered in length direction. The blast load is calculated for the said cases as per UFC 3 on front façade. The nonlinear nodal time history analysis is performed in SAP2000 with triangular impulse of blast load and hinges are assigned as per FEMA 356 to beams and columns. The displacements and hinge status observed revealed that the structure is unable to sustain sai blast load as maximum lateral displacement is crossing the permissible limit as per UFC 3 02 (2008). Also the hinges status observed are beyond collapse state for few cases as per FEMA 356. Thus the structure designed using progressive collapse resis sustain single blast as well as sequential blast.

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