Effect of Blast on G+4 RCC Frame Structure

Need for designing certain important structures to resist blast loads is increasing in the recent past years, due to the enhanced terrorist operations. A bomb explosion can cause very serious damage on the building's external and internal structural frames. Collapse of one structural member in the vicinity of the source of explosion, may then create critical stress redistributions and lead to collapse of other members, and eventually of the whole structure. Due to the threat from such extreme loading conditions, efforts have been made to develop methods of structural analysis and design to resist blast loads. The analysis and design of structures subjected to blast loads require a detailed understanding of blast phenomena and its effects on various structural elements. Blast loads are in fact dynamic loads that need to be carefully calculated just like earthquake and wind loads. This paper presents the study of effect of Blast loading on a five storey RCC building. Effect of variable blast source weight is calculated by considering 30 m distance from point of explosion. The blast load was analytically determined as a pressure-time history and numerical model of the structure was created in SAP2000.The influence of the lateral load response due to blast in terms of peak deflections, velocity, accelerations, inter storey drift is calculated and compared. Keywords— Blast loading, pressure-time history, Story Drift, Plastic Hinges.