In Limcon Bolt Strength calculation in connections seems giving higher than usual AISC 360-05 procedure. In AISC formulation is 0.75*Fn*Ab. But if you apply same in Limcon results are not consistent. Is there any problem or what is the reason for this.
In AISC 360-10 table J3.2, for A490X bolts, Fnv is 579 MPa. It was 520 in the 2005 edition of the manual, however.
Here's a reference regarding the 2010 changes: http://msc.aisc.org/globalassets/modern-steel/archives/2011/11/2011v11_a_comparative_look.pdf
in my calculation 84.4 kN is 78.4 kN. Why there is difference. 0.75*520 (for A490M) * Ab (201 mm^2 for M16 bolt)