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Robot calculation note does not show the values for µ-factors, but by reverse calculating them from results it seems like Robot uses EN 1993-1-2 formulas for them. In 2009 corrigendum AC:2009 the formulas have been changed
EN 1993-1-2 (2005)
EN 1993-1-2 AC (2009)
Example
By calculating from Robot calculation notes we get µ_y = -2.29
Now if we insert values to equations we get
Small difference (-2.29 and -2.27) may occur from roundings, but value is clearly closer to the wrong value.
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