Steel beam and welded plate detail

[John6767]

Hi All,

I have a first floor extension similar to the one in the photo below, but about half the span (~3.3m span with two columns). The photo shows that they used a steel beam with a plate welded to the underside, but installed the beam to carry the outer leaf rather than the inner one!

What I think would be a better detail is the one below (Option 1); however, this brought up the issue of the corner bits (in red and yellow) left unsupported.
As a solutuion, I thought of either cantilevering Beam 1 with its plate over the column (Option 2), but the beam edge would be visiable from the sides, or extending Beam 1 above the column to carry Beam 2 and extend the plate for both a little bit (Option 3). Calculations will be provided obviously.

Can I have your thoughts, please?

 

[robinbanks]

the issue of the corner bits (in red and yellow) left unsupported

Wouldn't matter. I could knock a half bat out of the corner of any brick built wall, of any bond you care to choose, and nothing would happen to the rest of the structure

Can I have your thoughts, please?

Pick whichever one you like the aesthetic of most. Dare say you'd be able to do a design that deletes the columns if you so wish