Equation F1-5 of AISC 9th edition specifies for non-compact web sections that Fbz = 60%Fy
Equation F2-2 of AISC 9th edition specifies for non-compact web sections that Fby = 60%Fy
However, STAAD PRO version 20.07.10.65 is reporting for Non-Compact Web Sections that Fbz = 66%Fy and Fby = 75%Fy
Can someone provide a clarification?