Model Study of Dynamically Loaded Arch Structures

The Waterways Experiment Station (WES) is conducting a major research program to determine the response of buried, protective structures subjected to the effects of nuclear detonations. As a part of this program, a series of laboratory model and prototype structures was tested dynamically in the Blast Load Generator facility located at WES to evaluate the use of scale-model tests in predicting the elastic response of a laboratory-size prototype structure to dynamic loads. The results of tests of three metal arch structures having diameters of 8 in., 16 in., and 24 in., respectively, placed at various depths of burial in dry sand and subjected to ground surface overpressures ranging from 57 psi to 196 psi is presented. Peak dynamic deflections, strains, thrusts, and moments were adequately predicted for a laboratory-size prototype from the results of scale-model tests. The model theory was substantiated, at least within the limits of the experiment. The effect of depth of burial on the response of the test structures is also examined.