Finite-Element Calculations of Foam HEST 1.
Abstract
The results of analytical studies in which the HONDO dynamic finite-element (FE) code was to perform (1) a two-dimensional (2D), plane-strain calculation of the Foam HEST 1 test event, (2) a second 2D calculation identical with the first except that the backfill properties were changed from those of the sand used in Foam HEST 1 to those of a hypothetical low-strength clay, and (3) companion 1D calculations for a section through the backfill, a section through the center of the roof, and a section through the sidewall of the structure. For locations in the backfill above and/or well away from the structure, vertical stress-time histories from the 2D calculation were in good agreement with those measured by the vertically oriented stress gages in Foam HEST 1. Early-time particle velocity comparisons in the sand backfill were reasonably good, but the measurements after about 5 ms appear to have been significantly influenced by relatively compressible native soil materials beneath the backfill which were not modeled as such in the calculation. The peak stress and impulse delivered to the center of the roof were higher for the clay backfill calculation than for the sand backfill calculation. For shallow depths in the backfill, the agreement between 1D and 2D calculations of vertical stress was excellent for both sand and clay; for deeper locations in the clay, the 2D calculation histories were significantly altered by waves coming through the native soil ahead of those traveling directly through the backfill.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1980
- Accession Number
- ADA085255
Entities
People
- Jon Enrique Windham