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Aprop is an AutoCAD Lisp program which calculates the structural section properties and extrusion information utilizing an integration of area method about lines and arcs of a given shape. The utilization of this method provides a level of accuracy not found in similar programs and instantaneous results. Aprop can accommodate solid or hollow shapes and is unique in providing options for utilizing steel or aluminum, assemble or composite addition of different members.
The shapes being analyzed need to be closed polyline entities (including circle and ellipse) so that the area can be calculated. The shapes need to be 2D profiles; therefore, AutoCAD regions are not usable by the current version of the APROP software.
Likewise, the shapes being analyzed cannot be AutoCAD blocks or groups. They must be exploded or reduced to single entities before selection and calculation.
After selecting a shape, all calculations are made based upon current setting of the drawing. In the current version of APROP, shapes are assumed to be drawn in English units, but you have the option to output in either English units or metric units, or both.
The tab labeled “Options” provides the space to declare options that will modify the output of the APROP Calculation run.