Concerns about Corner Bar Detail
Concerns about Corner Bar Detail
(OP)
thread507-223809: slab on grade column blockout re-entrant corner reinforcement?
Please see the attached standard detail for corners and intersections. Depending on the location the corners will be exposed to lateral on either the inside face, outside face, or both. This is not a typical detail that I have seen before. The Engineer provided a new detail that is standard to what I have seen, but has requested to keep the old detail in one of the structures in which the detailing was complete as not it impact the job schedule. Any Insight would be helpful.
Please see the attached standard detail for corners and intersections. Depending on the location the corners will be exposed to lateral on either the inside face, outside face, or both. This is not a typical detail that I have seen before. The Engineer provided a new detail that is standard to what I have seen, but has requested to keep the old detail in one of the structures in which the detailing was complete as not it impact the job schedule. Any Insight would be helpful.






RE: Concerns about Corner Bar Detail
RE: Concerns about Corner Bar Detail
I can see the source of your concern as this does not appear to be a very well thought out detail.
As ron has said, the bars on the inside corner will tend to pop out the cover under bowstring effect if they are in tension.
Also there are a lot of bars in this corner, which could lead to poorly compacted concrete and thereforefore (counterintuitively) more cracking.
I have never specified diagonal trimmer bars in this situation.
RE: Concerns about Corner Bar Detail
This ruined my morning.
RE: Concerns about Corner Bar Detail
Dik
RE: Concerns about Corner Bar Detail
Corner Bar Detail:
1. Don't hook bars on outside face. Use only L dwls.
2. Move hook from inside face to outside face to develop bars.
3. Extend diagonal bars to outside face.
4. Omit L dwls on inside face.
Wall Intersection Detail:
1. Remove hook from bars each side of wall.
2. Reverse direction of L dwls so they lap across wall.
BA
RE: Concerns about Corner Bar Detail
Thanks for the comment on my other thread. I wanted to see what some others had to say about it. The other side of this is that the diagonal bar cannot be bent as shown in the detail. The way the bar can be bent would extend the bar to the outside face (as suggested by BA). We are also in the process of installing the steel in the field. The standard detail was updated, but we were directed to use the one I attached for the BAF Structure. This structure was designed by a different Engineer than the Engineer of Record for the project. I am not confident that the Engineer confirmed with the Design Engineer before directing us to use the old detail.
RE: Concerns about Corner Bar Detail
RE: Concerns about Corner Bar Detail
The bars should extend to the opposite face (more or less). If a high tension load, then too close to the face may cause the concrete to spall...
Dik
RE: Concerns about Corner Bar Detail
RE: Concerns about Corner Bar Detail
Brad
RE: Concerns about Corner Bar Detail
The thread referenced by Splitrings is a different one, and much more applicable, than the one you posted. The works by Nilsson should be required reading for anyone designing corners subject to opening forces.
RE: Concerns about Corner Bar Detail
You are correct. That is the thread I was reading prior to starting this one. I must have added the wrong thread as I meant to add the one that Splitrings referenced. Thanks for the correct reference.