Where is the 5 1/4 x 18M or 3 1/2 x 12M called out? On the member or in the plans? If it is called out in the plans, then the plans should state what the minimum design values are required for it.
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.