Dynamic response of a model buried field shelter. Project LN314, Operation Prairie Flat
Kennedy, T. E. (Thomas E.)
Technical reportAbstract: Operation Prairie Flat, a 500-ton TNT surface burst detonated at the Defence Research Establishment, Suffield, located near Medicine Hat, Alberta, Canada, provided the U. S. Army Engineer Waterways Experiment Station an opportunity to obtain data pertinent to the design of structures that can resist the effects of blasts from nuclear weapons. This test operation was a joint effort by the United States, Canada, and the United Kingdom in which there were 39 United States approved projects. The objective of Project LN314, discussed herein, was to investigate the dynamic response of a 1/2- scale model of a flexible-arch troop shelter when subjected to the blast effects of a surface burst. Specific objectives were to (1) determine the gross motion of the structure with particular emphasis on the response of the footings, (2) determine thrust and moment relations at various sections of the structure, and (3) obtain response data from a field test for correlation with similar data from laboratory simulation tests. A 1/2-scale model was tested at a ground range of 400 feet and an overpressure of 142 psi. This structure was buried in dense sand with the crown of the arch 2 feet (1/2 the radius of the arch) below the ground surface. The motion response was generally as expected, with approximately a 6-inch permanent vertical displacement. The transient measured response compared very well with that predicted, based on laboratory model tests. The structure was uncovered after the test, and it was observed that no major damage had been sustained by any structural components.
Weapons Effects Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Blast effects; Dynamic loads; Explosions; Models; Prairie Flat (Organization); Shelters; Subsurface structures
Technical report (U.S. Army Engineer Waterways Experiment Station) ; N-70-6.
Approved for public release; distribution is unlimited.