While designing a UPT ISECTION and UPT WIDE FLANGE profile to CSA S16-09/14/19, the program ignores the user-provided shear areas and calculates them internally. As a result, the shear capacity and shear ratio are evaluated based on the program-calculated shear area values and not in accordance with the user provided ones. This may lead to unconservative results if the program-calculated shear area values are greater than the user provided values.
The issue occurs when all of the following are true on the design of a given member:
1) the member is assigned with a UPT ISECTION or UPT WIDE FLANGE profile2) shear areas specified in the upt are less than the program-calculated values for the profiles 3) the member is designed to CSA S16-09/14/19 codes
No workaround is available as of now for this defect.
The defect will be addressed in the next commercial release of STAAD.Pro.