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|Title:||Fundamental studies of medium-structure interaction. Report 1, Finite element analysis of buried cylinders|
|Authors:||United States. Defense Nuclear Agency.|
Kirkland, Jesse L.
Walker, Robert Evans.
Finite element method
|Publisher:||Weapons Effects Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; N-72-7 rept.1.|
Abstract: A finite element computer program developed by the University of California, Berkeley, was adopted and modified to perform static analysis of buried structures. Two separate variable-moduli soil models were used in the code to analyze the response of 6-inch-diameter cylinders having wall thicknesses of 1/8 1/4, and 3/8 inch when buried to a depth of 9 inches in dry sand and subjected to a static overpressure. The computed results were compared with experimental results obtained from static tests of these cylinders in the Waterways Experiment Station Small Blast Load Generator. The computer code developed generally yielded a fair approximation of the structural response of the cylinders tested with either of the two soil models employed. The major area of discrepancy between experimental and calculated results was in the values of moment and thrust for the thicker cylinders. The nature of these discrepancies indicates that the expected lateral support of the cylinders did not develop in the experiments. This fact is explained by the possible existence of an area of low-density soil below the spring line and adjacent to the cylinder (the region where sand placement is most difficult). The code, in general, represents a reasonable method for predicting the response of buried cylinders, and undoubtedly other geometries as well. However, analysis of stiff cylinders is confounded by the fact that a detailed knowledge of the interface zone is needed because of the small motion of the spring line of such stiff cylinders.
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