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Tension bolt resistance Ft,Rd is calculated according to the EN 1993-1-8, Art 3.6.1, Table 3.4. In SCIA Engineer the tensile stress area of the bolt As is used together with the coefficient k2 equal to 0,9.
For anchor bolts in column base connection a modification to the formula above is given by publication " RECOMMANDATIONS POUR LE DIMENSIONNEMENT DES ASSEMBLAGES SELON LA NF EN 1993-1-8" published in 2015. The initial formula is multiplied by additional coefficient b, with default value of 0,85. The default value may be modified in "Anchor data" dialog.
With reference to EN 1993-1-8, Art. 3.6.1 (3) it is assumed that the bolt threads do always comply with EN 1090, therefore the relevant resistance values based on formulas given in Table 3.4 should not need to be multiplied by an additional factor of 0,85.