BLAST LOADING ON ABOVE GROUND STRUCTURES

Abstract

A bomb explosion within or immediately nearby a building can cause catastrophic damage on the building's external and internal structural frames, collapsing of walls, blowing out of large expanses of windows, and shutting down of critical life-safety systems. Loss of life and injuries to occupants can result from many causes, including direct blast-effects, structural collapse, debris impact, fire, and smoke. The indirect effects can combine to inhibit or prevent timely evacuation, thereby contributing to additional casualties. In addition, major catastrophes resulting from gas-chemical explosions result in large dynamic loads, greater than the original design loads, of many structures. Due to the threat from such extreme loading conditions, efforts have been made during the past three decades to develop methods of structural analysis and design to resist blast loads. Studies were conducted on the behavior of structural concrete subjected to blast loads. These studies gradually enhanced the understanding of the role that structural details play in affecting the behavior. The analysis and design of structures subjected to blast loads require a detailed understanding of blast phenomena and the dynamic response of various structural elements. This gives a comprehensive overview of the effects of explosion on structures.A 10 storied building will be selected for computation of blast loading and its effect on the RCC framed structure. The actual effective distance from explosion (standoff distance) i.e. R is taken as 5 m, 10 m, and 15 m respectively for the equivalent TNT (Trinitrotoluene) charge weight, W = 25 Kg, 50 Kg and 75 Kg respectively. The blast pressure coming from different values charge weights of TNT are considered with different positions (standoff distances) of the blast points relative to the column. The 3D model of a column will be analyze using ETABS or STADPRO. The effect of the blast loading will be modeled in the dynamic analysis to obtain the total deflection, stress and strain in the column.