composite floor hole trimming

[oneintheeye]

hi whats the absolute max you have cut a hole before triming around. No other holes in span, just one hole.

 

[hokie66]

If the hole won't fit between the reinforcing steel, you have to trim around it.

 

[csd72]

What hokie says is pretty much true. In a composite slab you will only have mesh reinforcement, which cannot be displaced around a hole.

Simplest solution is to tell them to replace the area of steel cut by the bars.

Of course, if the slab is in a place where crack can be tolerated then you may choose to accept one or two bars cut.

 

[oneintheeye]

yes we only have mesh, for crackng. So basically what your saying is it shouldn't fall down. Hole is less than foot and half but over the general rule minimum.

 

[ishvaaag]

Run an analysis. I have read in print and see it is true in practice that for plates or slabs there being holes is many times of scarce significance to reinforcement, since you eliminate at the same time enough weigth as to produce the effect. But always check, and of course, a good treatment of any new limits is worth.

Also in composite beams discern what the effect will have structurally, even if permissible, one does not like to see a compression head reduced to a half.