Structural Member: Built Section Vs Solid Plate
I have two structural components that I am designing. One is basically a pad eye, the other is a pillow block for a shaft line. In both components my design calls for a single piece of heavy 3" plus thick plate. If I were to build these heavy plate sections from two 1.50" thick plates welded together, how does that change my structural design? Is there a difference in the two from a loading perspective?
Both of these components will be welded to other members. With a built section for the pad eye, how should the "anchor" welds be considered? Normally, with a solid section weld calculations are the perimeter of the solid part. When you have two plates welded together this essentially leaves a seam between the two that will not be welded to the frame. OR am I over thinking this?
As for the pillow block built section, only one piece of plate will be welded to the frame. The other half is hanging out in space but welded to the first piece. There will be a common bushing on the shaft at the built section. Is it accurate or grossly conservative to apply the full bearing load of the shaft to the entire built section, or only to one piece of plate within the built section?
Ultimately, what load should the weld on the parting line of the built section be designed to withstand to prevent possible separation of the built section?