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Rebar Demo at top of column

Rebar Demo at top of column

Rebar Demo at top of column

(OP)
I have an INTERIOR condition, where the column is being removed down to the slab level.

The slab is post-tensioned, and the vertical column bars are #11's (USA)

Knowing that it is an interior condition, is it structurally appropriate to remove the bar flush with the top of the slab?

If not, is it possible to drill the bars down to 1/2" below the slab and fill with epoxy?

Thoughts?

RE: Rebar Demo at top of column

I think that you're fine to got to the top of the slab. I don't think that fire rating of the exposed bar ends is a big deal.

The only issues that I can see here are:

1) If the slab and/or column design requires moment transfer at the joint, anchorage of the column steel may need to be evaluated for that.
2) You've removed some of the compression on the lower column and have changed the ratio of bending to axial load. That may impact the felxural strength of the column.

I doubt that either of these issues will cause you any grief. At an interior column, their impact is pretty nominal. I imagine that's why you specifically noted that this is an interior column.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Rebar Demo at top of column

Removing the upper column may also affect the slab bending as well - reducing the resisting column stiffness and adding to flexure in the slab.

Bars exposed are probably OK for fire resistance (heat goes up) but I might worry about rusting/deterioration if there is any moisture exposure from activities within the space.

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