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If the design setting Use shearwall deflection to calculate rigidity is selected, the program determines shearline rigidity for rigid diaphragm analysis by summing the rigidities of all segments along the line, where the rigidity is defined as the force on the segment divided by the deflection of the segment.
Equal Deflections
If deflections have also been equalised along the line via Distribute Forces to Wall Segments based on Rigidity, then this is equivalent to dividing the total force on the line by the deflection.
Change to Manual Input
If you change the setting from Use shearwall deflection to calculate rigidity to Manual input of relative rigidity, in order to adjust the rigidities, the rigidities that appear in the input for a particular wall are the sum of the rigidities for all segments along the line, divided by the wall length.