CONTAINING SHOCK WAVES GENERATED IN EXPLOSIONS BY: CHIRAPHA ANANTAPHATHANAWONG
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1 CONTAINING SHOCK WAVES GENERATED IN EXPLOSIONS BY: CHIRAPHA ANANTAPHATHANAWONG
2 BLAST WAVES Adam, Sharon. Blasting. Retrieved from
3 SHOCK WAVES Youtube.com
4 BLAST EFFECTS As the shock wave expands, pressures decrease rapidly over time. Explosion is highly compressed air that expands until reaching equilibrium with surrounding air. Explosive detonations create an incident blast wave, characterized by an instantaneous rise from atmospheric pressure to a peak overpressure. Needham CE (2010) Blast waves. Springer, Heidelberg
5 FACTORS ON MAGNITUDE AND DISTRIBUTION OF BLAST LOADS ON STRUCTURE Explosive Properties Location of the detonation relative to structure Reinforcement of the pressure pulse through its interaction with the ground or structure Retrieved from Retrieved from
6 BUILDING DAMAGE Direct Air-Blast Effects Damage caused by high-intensity pressures of the air-blast close to the explosion Progressive Collapse After air-blast effects, it leads to the failure of exterior walls, windows, floor systems, columns, and girders. Retrieved from Retrieved from
7 BUILDING DAMAGE Blast Pressure affects to the structural. Retrieved from
8 INJURIES FROM BLAST WAVES
9 CASE STUDY
10 BRODE S ANALYSIS Peak Static Overpressure pp ss = 6.7 ZZ bbbbbb, wwwwwww pp ss > 10 bbbbbb pp ss = ZZ ZZ ZZ bbbbbb, wwwwwww 0.1 < pp ss < 10 bbbbbb Z is scaled distance: ZZ = RR ww 1 3 R is distance from the charge center in meter W is the charge mass expressed in kilograms of TNT
11 BLAST WAVES FROM OTHER SOURCES Example: Given: 100 kg charge of RDX TNT Find: Equivalent mass in Solution: 100 x = kg of TNT
12 BRODE S ANALYSIS Peak Static Overpressure pp ss = ZZ ZZ ZZ ZZ 4 bbbbbb, 0.05 ZZ < 0.3 pp ss = ZZ ZZ ZZ 3 bbbbbb, 0.3 ZZ 1 pp ss = ZZ ZZ ZZ 3 bbbbbb, (1 ZZ 10)
13 CASE STUDY SOLUTION Given: W = 5 kg of TNT R = 5 m Find: Solution: Peak Static Overpressure, pp ss ZZ = RR 1 3 = 5 mm 5 kkkk WW 1 3 =
14 CASE STUDY SOLUTION Since Z = 2.9, so Z is between 1 and 10 pp ss = ZZ ZZ ZZ 3 bbbbbb = = bar = 83.2 kpa
15 CONCLUSION FROM CASE STUDY ZZ = RR ww 1 3 pp ss = ZZ ZZ ZZ ZZ ZZ < 0.3 bbbbbb, pp ss = ZZ ZZ ZZ ZZ 1 bbbbbb, pp ss = ZZ ZZ ZZ 3 bbbbbb, (1 ZZ 10) Retrieved from Increasing in distance from the explosive to the building causes the peak static pressure to decrease More explosive mass causes the peak static pressure to increase.
16 EXPERIMENT METHODS EXPLOSIVE FIELD-TESTS SHOCK TUBE EXPERIMENT Retrieved from Retrieved from
17 CONCLUSION Blast waves from explosion can cause catastrophic damage Building damage Injuries Understanding shock waves is important first step of the project Pressure wave decrease over time after the blasting Blast wave instantaneous rises from atmospheric pressure to peak overpressure From the case study, it shows that the peak static overpressure depends on the mass of explosive and distance between explosive and structure. Experiment methods Explosive field test Shock tube experiment The project still needs more research and testing
18 REFERENCES Bangash, M. Y. H., and T. Bangash. Explosion-resistant Buildings: Design, Analysis, and Case Studies. Berlin: Springer, Print. Needham, Charles E. Blast Waves. Heidelberg: Springer, Print. Shukla, A., Y. Rajapakse, and Mary Ellen. Hynes. Blast Mitigation: Experimental and Numerical Studies. New York, NY: Springer, Print. Smith, P. D., and J. G. Hetherington. Blast and Ballistic Loading of Structures. Oxford: Butterworth- Heinemann, Print. Structures to Resist the Effects of Accidental Explosions. Washington, D.C.: Depts. of the Army, the Navy, and the Air Force, Print.
19 Retrieved from
20 Retrieved from
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