Joint Selection Using EXTRACT Not Reflected in Listing Output



Problem

Users performing fatigue analysis define specific joints using the EXTRACT input (User Designated Joints) to limit fatigue output to selected joints. However, the listing file still displays joints beyond the selected set, leading to confusion on whether the joint selection has been applied correctly. 


Answer

This behavior is expected.

In SACS, the EXTRACT input is used to specify joints for which fatigue data is to be extracted for use in the Interactive Fatigue program. The joints are defined in columns 10–78 of the EXTRACT line, with a corresponding header line containing only EXTRACT in columns 1–7.

This selection applies specifically to fatigue data extraction and post-processing outputs, such as extraction files, and does not control the content printed in the listing (.lst) file.

The listing file is intended as a general summary of the analysis, and its content is not filtered based on user-designated joints. Therefore, even when EXTRACT is correctly defined, the listing may still include joints outside the selected set.

To review fatigue results for specific joints, users should refer to the fatigue extraction outputs or post-processing tools, where the defined joint selection is properly enforced.

This confirms that the analysis is functioning as intended, and the observed behavior does not indicate an issue with the model setup.