© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 86 ANALYSIS OF G+6 STORY STEEL STRUCTURE UNDER BLASTING EFFECT Parth S. Pandya, Aakash Suthar 2 1 Student of Master of Engineering, Ahmedabad, Dept. of Structural Engineering, L.J. University, Gujarat, India 2 Assitant professor, Ahmedabad, Dept. of Structural Engineering & Technology, Gujarat, India --------------------------------------------------------------------***----------------------------------------------------------------------- Abstract: A detailed study of the progressive collapse analysis of multi-story buildings subjected to blast loading is now required due to the severe damage to property and life caused by recent terrorist attacks on the infrastructure. Research has typically been conducted using the Alternative Path Method (APM) with sudden column removal while neglecting the ideal site for blast loading. In this thesis, 3D models of a steel building with six stories and direct blast load modelling are suggested. Additionally, the impact of blast loading has been assessed at numerous sites. Two different types of explosive events—vehicle-borne and package bomb—have been taken into consideration. By employing a numerical model of the structure created with the "STAAD PRO" SOFTWARE, the blast load is analytically computed. By using a published example of a 7-story steel building that was subjected to blast load, the numerical model is validated. The collapse of steel buildings has been postulated as a possible outcome of the finite analysis, and proposals have been made to control it. By using a published example of a 7-story steel building that was subjected to blast load, the numerical model is validated. Keywords: Keywords: Steel Structure, Blast, STAAD PRO, APM, Collapse, Vehicle Bomb, Package Bomb, G+6 Storey. Introduction General Although it is impossible to completely stop terrorist attacks on buildings, it is possible to greatly reduce their impact by taking preventative measures and using proactive strategies. It is essential to comprehend the structure, its intended use, and any concerns posed by terrorist attacks in order to identify the strategies most likely to be effective in reducing the negative effects of the attacks. When compared to the whole lifespan costs of the building (which also include the land estimation and security checking), the cost of renovating the building for a "particular level" of assurance against terrorist threats may not be very high. A bomb blast inside or around a building can have disastrous impacts, harming and crushing interior or outside portions of the building. The type and layout of the building, the materials used, the range of the explosive device that was found, and the charge weight all affect how much damage a bomb causes. Case studies from various countries are examined, but they are by no means exhaustive because other explosions may occur and building sub-frameworks may sustain additional collateral damage in the future. Explosion and Blast Phenomenon An explosion frequently occurs when a significant amount of energy is released rapidly inside a small area. Explosions can be classified as physical, nuclear, or chemical occurrences based on their nature. In physical event: - Energy may be released in the event of a catastrophic failure of a pressurised gas cylinder, a volcanic ejection, or even the mixing of two liquids at different temperatures. In nuclear event: By regenerating protons and neutrons inside the inner acting cores of different atoms, energy is released from the development of those distinct atoms. In chemical event: The primary source of energy is the quick oxidation of carbon and hydrogen atoms, which make up the fuel. According to popular belief, there are numerous types of high explosives accessible, and because each explosive has unique detonation characteristics, each blast wave's qualities will vary. TNT is being utilised as the industry benchmark, with all values represented in terms of a TNT equivalent charge mass. As it may be considered as a charge in terms of TNT and depending on the weight, calculation can be done, analysis and design can be done for both physical and chemical explosions. In contrast, there is no suitable methodology for analysing nuclear explosions since they emit abnormally high levels of atomic radiation when neutrons are present. Fig 1.1 shows the different type of explosive. Explosive are classified mainly into two parts International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 06 | Jun 2023 www.irjet.net p-ISSN: 2395-0072