The option is used to determine additional parameters for the analysis of stability of members in bending for the Romanian code STAS 10108/0-78. It is accessible after pressing the icons in the Member definition - additional parameters dialog box.
The options in this dialog box are used to define a pattern of distribution of bending moments along the length of the analyzed element. This information is used in the verification of stability of elements subjected to the simultaneous action of a compressive force and bending moments (see point 8.2).