RC beam on steel column offset

[n3jc]

Greetings,

Residental building - I have two RC beams (cross section 250x490 mm – partially embedded in the RC slab) that are supported on the steel column (D/t = 150/10 mm). The axial compression force in the column is large (400 kN).

In my model I defined the steel column as pinned on both ends. The botom of the column will be anchored to the RC slab by steel plate welded to the column + anchors. At the top there will be some Nelson studs welded on the steel plate that will be placed inside beam reinforcement cage before pouring the concrete.

Given that I expect that in reality there will be some moment transfer from beam to the steel column.

Questions:

1) Should the steel column be designed for axial load and bending moment as a result of beam2/colum offset of e=225 mm?

2) What is the best reinforcement detail between beam 1 and beam 2 at intersection of beams? It's hard to say that beam 1 is supporting beam 2 since the column offset is not that large. Thoughts?


Thank you for help.

3D model:


TOP VIEW:


SECTION:

 

[KootK]

I don't feel that you need to design for the 225 eccentricity at the column. That should be getting rectified by the girder beam flexure. There may well be a moment at the top of the column but that would just be a result of rotational compatibility between the girder and column.

This is what I'd seek for detailing. It's a bit overkill but, in my opinion, not worth thinking about any harder than this. The approach is basically what you'd do if that offset were 1000+ instead of 225.