SHALLOW-BURIED MODEL ARCHES SUBJECTED TO A TRAVELING-WAVE LOAD
Abstract
Operation Snowball Project 3.4 consisted of tests performed on twelve model arches to determine their behavior under a traveling-wave blast loading. The prime objective was to define the body motions for a comparison with a previously developed theory. On recovery of the structures after test it was found that the four 30-inch span arches were in relatively good condition; however, most of the eight 12-inch span arches were badly damaged. The damage was inflicted by ejecta of large, densely-compacted, hard lumps of clay. Fortunately, the ejecta did not obscure the results from the large arches on which all of the electronic instrumentation was located. All electronic instrumentation operated and records were obtained for all transducers. Actual body motions were larger than those determined from the theory. Test results indicate that the foundation modulus varies and that arching shear should be expressed as a function of deflection. Considerable data was obtained on shell response. Thrust distribution around the arch was fairly uniform, even though moments on the lee side were 30 percent greater than those at the same distance from the spring line on the blastward side. Among other information, it was found that: (1) the floor displaced about the same as the free field at the corresponding elevation; and (2) large forces developed in the footing tie bars.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0622552
Entities
People
- J. R. Allgood
- R. H. Seabold
Organizations
- Naval Facilities Engineering Service Center