Make an Existing non-composite beam act composite?
Make an Existing non-composite beam act composite?
(OP)
Have any of you guys modified an existing non composite steel beam with existing concrete slab on it so as to make the beam act Composite with the concrete??
I have heard of a way of coring out the concrete down to the top of the beam flange, welding on studs, and placing non-shrink grout in the core??
Has anyone had experience with this??
I have heard of a way of coring out the concrete down to the top of the beam flange, welding on studs, and placing non-shrink grout in the core??
Has anyone had experience with this??






RE: Make an Existing non-composite beam act composite?
Regards,
Lutfi
RE: Make an Existing non-composite beam act composite?
RE: Make an Existing non-composite beam act composite?
RE: Make an Existing non-composite beam act composite?
About 7 years ago I designed and constructed NEW composite steel beams to an EXISTING PT slab that required strengthening for a new dynamic load. There was very limited head room available underslab - hence why we needed composite action.
We cored the PT slab (scanned it first to miss the tendons), then used a paper template to mark the location of cored holes to proposed stud locations. Welded the studs to the top flange of the beam on the ground, then lifted the beams up with the studs passing though the cored holes.
We elected to use low-exothermic 2 component epoxy resin mixed with silica sand for the grout of the annulus between the stud and cored hole - and also epoxy injected the small space/gap between the top flange and underside slab.
A pre-bagged cementitious grout would have also worked to fill the annulus.
For your case with an EXISTING steel beam in place to be made composite, the coring will work the same but you need to make sure the core hole is large enough to enable the stud welding machine access. I guess you cannot undertake a 'bend test' of a welded stud either, unless a sample area be chipped out.
HTH
RE: Make an Existing non-composite beam act composite?
Regards
VOD
RE: Make an Existing non-composite beam act composite?
RE: Make an Existing non-composite beam act composite?
RE: Make an Existing non-composite beam act composite?
RE: Make an Existing non-composite beam act composite?
The beam is not overstressed at the moment, but it will be.
The beam carries a dead load of 0.36klf. I will be adding the same amount of dead load to it (new dead load =0.72klf), + designing for the existing live load of 0.6klf.
tweedledee
RE: Make an Existing non-composite beam act composite?