Accession Number:

AD0425539

Title:

USE OF MODELS TO PREDICT THE DYNAMIC RESPONSE OF DYNAMICALLY LOADED UNDERGROUND STRUCTURES,

Descriptive Note:

Corporate Author:

IOWA STATE UNIV OF SCIENCE AND TECHNOLOGY AMES

Personal Author(s):

Report Date:

1963-11-01

Pagination or Media Count:

224.0

Abstract:

Similitude requirements for predicting the dynamic response of underground structures are investigated, and the validity of the proposed model design conditions is checked experimentally. The structures used in the tests were hollow aluminum cylinders instrumented with SR-4 strain gates. Most of the tests were run on circular cylinders having diameters of 4 in., 2 in., and 1 in. Some data are also presented for structures having square cross sections. In all tests the structures were buried in dry Ottawa sand. Three different types of loaders were used in the test program a drop-weight loader, a vertical shock tube, and a horizontal shock tube. Peak strain and complete strain-time curves were obtained for various depths of burial and a detailed analysis of the data is presented. For the one series of tests performed with the horizontal shock tube no consistent data were obtained. A discussion of the discrepancies encountered is presented. Several series of tests were completed with the drop-weight loader and the vertical shock tube. The results of these tests indicate that the proposed similitude requirements are satis factory with the range of parameters investigated. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE