By United States. Naval Facilities Engineering Command
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Additional info for Blast resistant structures
A. Simplifications in the Development of Design Procedures. Certain simplifications have been made in the development of the design procedures presented in this manual. As a result, an analysis of a structure using these procedures will generally result in a conservative estimate of the structure's capacity and, consequently, structures designed using these procedures will generally be adequate for the blast load exceeding the assumed loading conditions. b. Modification of Charge Weight. Certain unknown factors can result in an overestimate of the protective structure's capability to resist the effects of an explosion.
A. Predicting Parameters of a Shock Wave. Figures 4-5 and 4-12 of NAVFAC P-397 provide a means of predicting the peak pressures, impulses, velocities, and other parameters of a shock wave for a bare spherical TNT explosive charge detonated in free air and on or very near ground surface. These parameters change, however, if the explosion occurs under shallow water. M. Swisdak is reproduced here. A detailed description of the work is provided in the report titled Explosion Effects and Properties: Part 1, Explosion Effects in Air, NSWC/WOL TR-116.
Because of the scatter in the experimental pressure data used to construct Figures 19 through 24 and the uncertainties involved in making the necessary extrapolations, the curves in this section should be considered accurate only to within +/-30 percent. The following parameters are used in the aforementioned figures: [lambda]Úd¿ = d/WÀ1/3Ù, scaled charge depth 8. [lambda]Úx¿ = R/WÀ1/3Ù, scaled horizontal distance [lambda]Úy¿ = y/WÀ1/3Ù, scaled vertical distance EXTERNAL BLAST LOADS ON STRUCTURES a.