Calculations of Three Test Problems by the 3-D TRANAL Code.

摘要

TRANAL, a three-dimensional, finite element, transient nonlinear analysis code, was used to calculate a series of three simple test problems. Although the test problems are not three-dimensional, a number of different aspects of the code were checked including timing, data management, nonlinear cap model routine, applied air pressure routine (Brode fit), and mesh generation. The test problems were designed by the Space and Missile Systems Organization in conjunction with TRW personnel. For two of the problems, TRANAL results are compared with results from LAYER, a two-dimensional, axisymmetric, finite difference code. The results compare quite well when the differences in code details are considered. A third problem, which involves a hollow concrete cylinder embedded in a two-layer soil system (clay over shale), is also studied. The conclusion reached is that, for the prescribed airblast loading (nuclear type), the walls of the cylinder will not fail in compression during the first 100 milliseconds, which is probably the most critical period. However, this conclusion is based on a simple two-dimensional, axisymmetric problem; in order to understand this soil-structure interaction problem more fully, it is necessary to perform a complete three-dimensional analysis. (Author)