By United States. Naval Facilities Engineering Command
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Extra resources for Blast resistant structures
In most design cases, the primary reason for determining the blast loads acting on the rear wall is to determine the overall drag effects on the building. The recommendations outlined in Chapter 4 of NAVFAC P-397 should be followed for local design of the rear wall. However, for analyses of frames and similar structures, it is recommended that the positive phase blast loads acting on the rear wall of a structure be taken equal to 60 percent of the incident overpressure. This is true for incident pressures of approximately 10 psi or less.
When the other charge locations are involved, Equation (17) should be used. This equation was recommended in NAVFAC P-397 to be used when the duration of the shock pressure on the wall of a cubicle is to be calculated. EQUATION: t'Úo¿ = (tÚA¿)ÚF¿ - (tÚA¿)ÚN¿ + (tÚo¿)ÚF¿ (17) where, t'Úo¿ = design duration of the positive pressure, ms (tÚA¿)ÚF¿ = time of arrival of the blast wave at the point on the wall farthest from the charge, RÚF¿ (tÚA¿)ÚN¿ = time of arrival of the blast wave at the point on the wall nearest to the charge, RÚN¿ (tÚo¿)ÚF¿ = duration of the blast pressure at the point on the wall farthest from the charge, RÚF¿ The procedure for solving Equation (17) is dealt with in depth in NAVFAC P-397.
This equation was used to construct Figure 11, based on Composition B explosive, cylindrical charges, and cube-shaped cubicles with the charge at the geometric center of the cubicle. However, changes in these parameters would introduce only small errors. (b) Equation (19) and Figure 11 were constructed for the pressures outside a 4-wall cubicle on a horizontal plane located at the elevation of the vent area. When the location of interest lies at a different location other than that of the vent area, the procedure outlined in Appendix C of Blast Environment from Fully and Partially Vented Explosions in Cubicles by Keenan and Tancreto should be followed.