RAM Frame AISC 360 Direct Analysis Method - Foundation Design

Question

For foundation design, do you check "Use Reduced Stiffness for Steel Members" when running RAM Frame module? 
 It seems to give different Max Unfactored Soil Bearing for foundation design

Seth Guthrie · Answer

I don't think it's necessary for foundation design. We noted that the stiffness reduction (Tau factor) is specifically for the design of steel members. See: ASCE 7, AISC 360, and the Direct Analysis Method in the RAM Structural System But it's more convenient to just keep in on for all purposes.