User Guide: A Three-Dimensional Stability Analysis/Design Program (3DSAD) Report 6, Free-Body Module.

摘要

3DSAD (Three Dimensional Stability Analysis Design) performs an overturning and sliding stability analysis for complex three-dimensional structures. Specific structure types and general shapes can be handled. General modules are: geometry--to define, display, and compute mass properties; loads-- to define, display, and compute loads; analysis--to perform a base analysis assuming a rigid body on an elastic foundation; and free-body--to use clipping capability for a free-body analysis. The Free-Body Module is a utility written to provide the user with the ability to perform an analysis of a structure at elevations or cross sections other than its base. It produces a free body containing a new definition of geometry and loads, by allowing the user the ability to clip the structure with a single plane or multiple planes. Output consists of a file containing the clipped geometry and loads data for use with the General Geometry or General Loads Module and a base file used with the forces and moments computed from the first data file to perform an analysis with the General Analysis Module. The General Analysis Module is used to produce a base pressure computation that is an approximation of the internal stresses in the structure at the clipping plane. Keywords: Computer-aided design, Free-body computation, Interactive graphics, Stress analysis, Structural stability, Three-dimensional graphics.