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Title: Dynamic test of a corrugated steel keyworker blast shelter : MISTY PICTURE
Authors: United States. Federal Emergency Management Agency.
Holmes, Randy L.
Slawson, Thomas R.
Harris, Aaron L.
Keywords: Blast effects
Shallow-buried structures
Underground structures
Soil-structure interaction
Nuclear Blast Shelter
Structural design
Structural analysis
Nuclear bomb shelters
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-87-31.
Description: Technical Report
Abstract: The 18-man blast shelter was tested dynamically on May 14, 1987 in the MISTY PICTURE event at White Sands Missile Range, NM. The main section of the shelter was fabricated from a 9-foot-diameter, 27.5-foot-long section of 10-gage, galvanized, corrugated steel culvert. The shelter included a vertical entryway and air intake and exhaust stacks. The shelter design was found to be conservative during a previous 50-psi validation test, and some constructibility problems were encountered with the entryway-to-shelter connections. This test was conducted to validate the modifications made to the shelter design. The modifications were made to reduce construction costs and improve constructibility. Primary modifications included: replacing the stiffened endwalls with lighter weight unstiffened plates, connecting the entryway to an endwall rather than to the main section of the shelter, and the inclusion of an emergency exit. The structure was located at the anticipated 200-psi peak overpressure level. Posttest inspection revealed that the main section of the shelter suffered very little damage during the test. The midlength vertical diameter increased approximately 1.4 inches and the horizontal diameter decreased approximately 1.4 inches. Rigid-body vertical displacement was 3.7 inches downward. Endwall deflections were less than 0.7 inch, and the emergency exit failed during the test. Due to the failure of the emergency exit cover plate, it was necessary to determine if enough pressure entered the shelter to affect its structural response. Since the magnitude of the internal pressure was relatively small in comparison with the overpressure measured at the ground surface, the pressure inside the shelter did not significantly affect the structural response of the shelter. This test also investigated the shock environment inside the shelter. Comparisons of shock spectra with typical equipment fragility curves were made. Based on test results, it is concluded that the shelter has the reserve capacity to resist overpressures as high as 148 psi from a 8-kt nuclear detonation without catastrophic failures, provided a redesign of the emergency exit is performed.
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