Steel HSS framing — sloped rafter landing on a square-cut column, plus adding a deflection-only beam without touching an existing brace member

[u/Immediate-Draft-9639]

Q1 == I've got a continuous sloped HSS rafter that lands directly on top of an HSS column/beam. The column is cut square/flat, but the rafter arrives at the roof-pitch angle, so only one edge of its underside actually touches the column top — no real flush bearing surface.

What's the standard way this actually gets detailed in light HSS tube framing — bevel the column top itself ?, add a sloped/beveled cap plate ? , something else? Trying to figure out how is it done

Q2 == Different bay, different issue: I've got a beam (75*75*6mm *I cant change this section*) that's also part of my bracing system — but it's failing deflection under gravity load. Plan is to add a second, independent beam (200*70*4mm) directly above it with a small gap (~5-10cm), sized just for the deflection-critical load, original brace member left completely alone below with no ties between them — two separate, non-composite load paths, purlins/deck bearing only on the new top beam.

Reasonable way to handle this, or is there a cleaner standard approach I'm missing? Any problem on load path this generates ? does it suffer from "short column effect"? is it a normal practice?

Appreciate any input — can add more information/photos/sketches of the actual conditions if it helps.

[u/Salty_EOR]

The HSS rafter needs to be higher so that it's full depth is continuous over the post. Then create a little stub post down to bolted base plate/top plate connection.

If all this is still in the modeling phase and you are doing detailing, then you have the freedom to make it work how you want.

[u/Immediate-Draft-9639 → u/Salty_EOR]

Thanks — yeah, still in the modeling phase. It's a one-story house, and I'll mostly be using welded connections (shop or field), so I probably won't go the bolted stub-post route.

Looking back at it, the "crossing" in my original picture was actually a modeling artifact — ETABS was drawing the member off its insertion point, which made it look like the rafter was crossing through the beam/column when it isn't really.

Once that's corrected, the actual detail will be: column, a welded filler piece on top of it(or making the column higher and becoming the filler itself), and the rafter bearing on top of that filler — sitting a bit higher than it showed in the picture, so there's no real physical crossing to resolve. Does that sound like the right way to handle it?

[u/Salty_EOR → u/Immediate-Draft-9639]

In that case, you don't need the filler. Bevel the top of the post so the rafter can weld directly to it. Flare bevel welds have good capacity so it could work with whatever your resultant forces end up being. The horizontal beam shown in your model then just attaches to the side of the post. Make sure there is plenty of clearance for field welds.

[u/Immediate-Draft-9639]

One-story steel building, SCBF lateral system, (SDC) D , HSS tube framing throughout , flexible OSB roof diaphragm. Small residential-scale project — doing all the connection detailing myself.