International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 06 | Jun 2024
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p-ISSN: 2395-0072
A Research On Behavior Of Tall Structure Under Blast Loading Deep Modi1, Kishan Pala2, Aakash Suthar3 1M.Tech Student, L.J. University, Ahmedabad
2Kishan Pala/3Aakash Suthar, Assistance Professor, structural Engineering Department, L.J. University,
Ahmedabad, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Today's A detailed study of the progressive
the structure (or direction of the blast). The structural response will vary depending on how these factors come together.
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 20-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. The collapse of steel buildings has been postulated as a possible outcome of the finite analysis, and proposals have been made to control it.
Figure 1: Collapse mechanism due to blast wave. The initial manifestation of the explosion's shock wave is observed to induce the fragmentation of windows, exterior walls, and exterior columns, as illustrated in the visual representation displayed in figure 1. Following this, the vigorous character of the shock wave impels the elevation of the floors and slabs, as depicted in the graphical depiction provided in figure 1.
Key Words: Steel Structure, Blast, STAAD PRO, APM, Collapse, Vehicle Bomb, Package Bomb, G+20 Storey.
Lastly, the shock wave envelops the edifice, leading to a downward force exerted on the roof and inward pressure exerted on all sides of the structure, as presented in the illustrated representation appearing in figure 1.
1.INTRODUCTION The investigation of blast impacts on structures has been the subject of formal technical investigation for more than sixty years. An explosion caused by a bomb inside or in close proximity to a building can led to damage to the building's external and internal structural frameworks, the collapse of walls, the fragmentation of large areas of windows, and so forth. Loss of life and injuries to occupants can occur due to various factors, including direct blast effects, structural collapse, fire, and smoke.
The occurrence recognized as air blast encompasses a blast wave that provokes an augmentation in air pressure in the proximity of a architectural formation. In the event of immediate ground disturbance, when an explosive is either partially or fully submerged beneath the exterior of the ground, it yields a lateral oscillation of the ground, resembling an earthquake but with a discernible frequency.
Traditional structures are generally not designed to withstand blast loads, and because the magnitudes of design loads are significantly lower than those produced by most explosions, traditional structures are susceptible to damage from explosions. The loading from a blast and its effects on a structure are influenced by several factors, including the weight of the charge, the location of the blast (or standoff distance), and the geometric configuration and orientation of
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