Concrete Failure in Tension
Concrete Failure in Tension
(OP)
Hi,
I have a Mass concrete in which a Steel Ribbed rebar is welded to the embedded plate as shown in the Figure attached.
The Rebar is subjected to tension to its full tension capacity, and it is Embedded in concrete to its full development length.
How the rebar would pull out concrete in a cone pattern or a bond failure around the concrete surrounding rebar.
Since concrete is weak in tension and no reinforcement is there in the mass concrete, please explain the failure in detail and why.


I have a Mass concrete in which a Steel Ribbed rebar is welded to the embedded plate as shown in the Figure attached.
The Rebar is subjected to tension to its full tension capacity, and it is Embedded in concrete to its full development length.
How the rebar would pull out concrete in a cone pattern or a bond failure around the concrete surrounding rebar.
Since concrete is weak in tension and no reinforcement is there in the mass concrete, please explain the failure in detail and why.








RE: Concrete Failure in Tension
RE: Concrete Failure in Tension
Is there rebar in the concrete? If so, that may open up some options for bypassing concrete breakout. The relative dominance of either the axial load or the moment is inmporrant as well. If one anchor would be in a compression zone while the other is in tension, that fact can sometimes be exploited to advantage.
Lastly, consider group effects in addition to single anchor capacity.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Failure in Tension
I'm concerned that your loading is right to the tensile limit of your rebar with no safety factor or margin.
Bond failure and breakout will depend on the actual concrete strength and mix parameters. Assuming good concrete mix design and particularly a good paste/aggregate ratio, bond failure is less likely than breakout.
As KootK mentioned, the spacing of the loaded rebar and its distance from and free edge of the concrete can have a significant effect on the breakout strength. If the failure cones overlap or intersect the free edge, the over-all breakout capacity will be lowered.
RE: Concrete Failure in Tension
Or it should be bond failure. There is no reinforcement in the concrete.
RE: Concrete Failure in Tension
If it was breakout failure please describe or show in picture in what pattern breakout happens.
RE: Concrete Failure in Tension
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Failure in Tension
RE: Concrete Failure in Tension
RE: Concrete Failure in Tension
RE: Concrete Failure in Tension
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Failure in Tension
I've done the same thing........but I've wondered if it is really applicable because we are not talking a headed anchor. But I've assumed that the ribs on the rebars are essentially doing the job.......BUT that would mean it would (likely) take more than a few ribs to get the job done (which would affect "cone" geometry).
Something I need to think about/run numbers on the next time I have to do it.
RE: Concrete Failure in Tension
On top of the cone breakout, I'd do a full section tension capacity check, if this is truly mass concrete without reinforcement.
RE: Concrete Failure in Tension
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.