International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
“REVIEW STUDY ON IMPACT OF BLAST LOAD ON R.C.C. BUILDING” Rajvee Patel1, Aakash Suthar2 1Student, Civil Engineering Department, L.I.J.E.T. Ahmedabad, Gujarat, India
2Assistant Professor, Structural Engineering Department, L.J.I.E.T. Ahmedabad, Gujarat, India
---------------------------------------------------------------------***--------------------------------------------------------------------1.1 BLAST PHENOMENA Abstract - Engineers are facing a significant issue with regard to structural safety and integrity. The challenge of designing a structure for the majority of complex loads has been simply resolved thanks to technological advancements. High-rise constructions, however, have only been allowed to be designed for seismic stresses. Terrorism has exhibited effects on buildings recently. These consequences raised the significance of designing the structure to withstand blast loads. Large pressures and heat are released into the air during blast explosions. Despite only lasting a few milliseconds, this occurrence has a negative impact on the structures. The primary goal of this study is to review existing literature on the blast loads that a structure might encounter, assess its vulnerability, and offer recommendations to the architect on how to economically reduce the impact of blast on a structure while still protecting people and infrastructure from explosion.
When a chemical, mechanical, or nuclear source releases energy suddenly, the situation is commonly referred to as a "blast." Buildings built to withstand blast loads are subjected to entirely different types of loads than are taken into account during regular design. Here, they are struck by a shock wave that is travelling quickly and may exert pressure that is several times greater than that felt during storms. A blast load is the force that a blast wave applies to a structure or object. It is made up of overpressure, which is the increase in pressure above atmospheric pressure caused by the shock wave from an air blast, and either impulse or duration, which results in catastrophic damage to the building's exterior and interior. The harm brought on by the force of an explosive blast is known as the blast effect. Huge quantities of hot gases are generated during an explosion, which compress the surrounding gases and cause them to move away from the blast source more quickly. The standoff distance is the separation between the blast source and the building. The pressure or intensity of the blast wave continues to decrease as it moves away from the blast source. As a result, the effect on buildings with greater standoff distances will be lessened, and it will take less time to reach the building. Depending on the pressure and distance from the explosion or blast source, the blast wave propagation curves change. A shock front or wave is produced when an explosion's blast wave propagates into the surrounding air. The entire building was subjected to blast pressure as a result of the shock wave that was formed. Analysis of the reinforced concrete frame structure is challenging because the impulsive load produced by an explosion is highly nonlinear and causes pressure in a very short amount of time. The weight of the charge (bomb size) and the standoff lengths between the blast source and the impacted structure (target) will determine the pressure intensities.
Key Words:
Blast Load, Standoff Distance, RCC structure, Storey drift, Displacement, Storey Shear.
1. INTRODUCTION Structures need to be protected against the blast impacts, especially those that are more likely to be the target of terrorist attacks. To lessen the losses brought on by the blast impacts on the buildings, it is crucial to conduct appropriate research in this field. The non-linear behavior of the material makes it difficult to examine the dynamic replica of the structure to blast loading. A thorough understanding of blast and related phenomena is necessary for the analysis and design of blast loading because blast explosions produce massive dynamic loads that are more complex than the initial design loads. The non-linear behavior of the material makes it difficult to examine the dynamic replica of the structure to blast loading. A thorough understanding of blast and related phenomena is necessary for the analysis and design of blast loading because blast explosions produce massive dynamic loads that are more complex than the initial design loads. The prediction, prevention, and mitigation of such events are of primary interest because when an explosion happens, harm may occur directly or indirectly, outside or internally, and it should therefore be potentially safe in all ways.
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2. LITERATURE REVIEW
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1.
Architectural and structural design of Blast resistant buildings.
Authors
Publication : 14th World Conference on Earthquake Engineering, China – October 2008.
: Zeynep Koccaz, Fatih Sutcu, Necdet Torunbalci.
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