Blast resistant structures by United States. Naval Facilities Engineering Command

By United States. Naval Facilities Engineering Command

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A quick glance at both Figures 4-5 and 4-12 will show that for a given distance from a detonation of the same weight of explosive, all of the parameters of the surface burst environment are larger than those for the free-air environment. c. Pressure-Time Variation. In the analysis of certain structures (steel frames, cold-formed members), a more accurate definition of the variation of the pressure as a function of time is required. This variation is usually referred to as the "p-T curve" of the blast wave.

Blast Pressure Output. 3. Unconfined Explosions. 4. Partially Vented Explosions. 5. Fully Vented Explosions. 6. Airblast From Underwater Explosions 7. External Blast Loads on Structures. 8. Pressure Increase Within Structure. 9. Multiple Explosions. 10. Primary Fragments. The topics listed above are dealt with in brief in this section. More detailed information is provided in the texts and documents referenced in this manual. Design examples are provided in paragraph 12 to help the user understand the procedures outlined in this section.

Primary Fragment Characteristics and Impact Effects on Protective Barriers, presents an in-depth discussion of primary fragment characteristics and part of this report is reproduced here. 5W/WÚc¿>]À1/2Ù (21) where, (2E')À1/2Ù W = = WÚc¿ = VÚo¿ = Gurney's energy constant, fps weight of explosive (oz). 2 times the actual explosive weight, as discussed in paragraph 2 of this section. weight of casing, oz initial velocity of fragment, fps (1) Figure 25 shows the variation of the normalized quantity VÚo¿/(2E')À1/2Ù, with W/WÚc¿ for this case.

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