RC beam to RC wall connection
RC beam to RC wall connection
(OP)
Hi all
I searched the thread but I couldn't find a similar subject.
How the RC beam to RC wall connection be detailed if the wall is spanning up the beam for several floors, while the beam is spanning from one column to the other column (passing the wall between the two columns)?
This concerns to the congestion of beams and walls re-bars in the region of the connection.
I searched the thread but I couldn't find a similar subject.
How the RC beam to RC wall connection be detailed if the wall is spanning up the beam for several floors, while the beam is spanning from one column to the other column (passing the wall between the two columns)?
This concerns to the congestion of beams and walls re-bars in the region of the connection.






RE: RC beam to RC wall connection
- Beam bottom steel will probably also run through.
- I'd stop the beam stirrups at the faces of the wall.
- I'd just discontinue the wall reinforcing at the beam to keep things simple. Depending on member sizes and density of reinforcing, it might not be a big deal to run the wall bars through the beam but, if you're going to go that route, I'd at least sketch up a decent scaled detail to convince yourself that it constructable.
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: RC beam to RC wall connection
RE: RC beam to RC wall connection
Why ever not? Sure, everything has to be designed and I can imagine some exotic situations where it might be problematic. However, for the general case of a little beam passing through the interior of a big old bearing wall, discontinuing a few bars surely wouldn't make a lick of difference. Especially in the common case where the beam is at a floor level.
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: RC beam to RC wall connection
Can partial bearing of beam on the wall (if the wall thickness is less than the beam width) exclude stirrups (shear strength) from the beam? do you consider vertical wall re-bars as legs for stirrups? I think partial bearing of beam on wall will decrease flexural reinforcement demand.
My thought is that the beam stirrups can be stopped if the wall is located near the center of the beam. If so, How about wall located near the columns?
What about compatibility torsion requirements for beams supporting discontinuous slabs? This requires stirrups additive to shear reinforcement (or side longitudinal re-bars).
After pouring concrete, do you drill/epoxy wall vertical re-bars on the beam for the next floor?
RE: RC beam to RC wall connection
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: RC beam to RC wall connection
RE: RC beam to RC wall connection
RE: RC beam to RC wall connection
RE: RC beam to RC wall connection
RE: RC beam to RC wall connection
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RE: RC beam to RC wall connection
BA
RE: RC beam to RC wall connection
Sort of a floor beam running parallel to and through and elevator shaft wall.
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RE: RC beam to RC wall connection
I'd say so. You couldn't really fail the beam in shear without also mobilizing the wall in shear. This may not apply at the roof level where your ability to keep the beam tied down tight to the wall is less apparent.
You could but it seems unnecessary. You'd also have to combine the shear demand with any other demands on those bars arising from their role as wall reinforcing.
It will absolutely reduce bottom steel demand. It adds top steel demand.
You do need to deal with that eccentricity somehow and tailor your detailing to reflect that. It might be easier to rectify your beam torsion via slab flexure.
As it happens, in this particular case, I agree with rapt that you should run your vertical bars through the beam. I imagine that you're using your walls as lateral load resisting elements? Shear walls?
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: RC beam to RC wall connection
RE: RC beam to RC wall connection
If that is the case, perhaps two beams could be used, each bearing on one corner of the elevator shaft (if that is what the square thing is).
I was under the impression that the wall above the beam did not extend down below the beam, so that the beam was supporting the wall.
BA
RE: RC beam to RC wall connection
Exactly.
If you can provide a sketch of your suggestion for the case stated in the first post. What one should do? Have you encountered such a problem?
RE: RC beam to RC wall connection
- Have.
- I recommend doing what I described.
- How about you sketch it up and I'll let you know if anything looks out of wack? No time today for homework assignments.
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: RC beam to RC wall connection
RE: RC beam to RC wall connection
BA
RE: RC beam to RC wall connection
It's a section through beam and wall showing wall longitudinal re-bar and beam re-bars
RE: RC beam to RC wall connection
I'm confused now. Do you want to discuss the other situation that I commented on in my first post. Or the situation that you posted in your sketch just now? They're different.
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: RC beam to RC wall connection
Join the club.
@ the OP: are you sure what you are asking about isn't a pilaster/a column built into a wall? You keep calling it a "beam".....but the sketches you have provided remind me more of a pilaster.
RE: RC beam to RC wall connection
Sorry, I didn't draw the slab because the main concern was about detailing so that avoid the congestion in the region of the beam and wall rebar
RE: RC beam to RC wall connection
BA
RE: RC beam to RC wall connection
Good point. If there is a door below the beam, then possibly you can cut the wall re-bars because it is discontinued in the door location.
Suppose the door is in the direction perpendicular to the beam span length