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unordinary shape of RC beam - reinf. detailing

unordinary shape of RC beam - reinf. detailing

unordinary shape of RC beam - reinf. detailing

(OP)
Beam is on top of columns and it supports timber beam + rafters (roof).
I have modeled/designed this beam as 420/300 mm cross section.
The main shear reinforcement is marked red, the rest (blue and yellow) are due to shape of a beam.
Would you detail it differently? Suggestions?


RE: unordinary shape of RC beam - reinf. detailing

Wouldn't that be a nightmare to form? Could it have a straight line on the right side (rather than that ragged edge)?

If you have to have it.....I'd add corner (vertical) bars where ever there is a hoop corner/intersection.

RE: unordinary shape of RC beam - reinf. detailing

Is that top part to catch thrust? I'm guessing not since you said only the red is the shear reinforcement. If indeed not, could you just have a regular rectangular beam under the timber beam? Otherwise that space adjacent to it looks like an excellent spot to collect water and rot that beam.

RE: unordinary shape of RC beam - reinf. detailing

(OP)
The shape has to be exactly as shown (I have to relate to existing shape of beams of a cementary structure).

I think no mater what kind of detailing I choose, it ll be nightmare to do in the field.

I hope someone has some better suggestion.

RE: unordinary shape of RC beam - reinf. detailing

Ah, ok. Well...if it has to be exactly that shape I'd say the way you've shown the detailing is probably about as good as any. Bars could be added, perhaps, but I think what you've shown -- with bars only at the corners -- is probably as efficient as it could be detailed.

It is what it is; perhaps it could be pointed out to the contractor it up front so he doesn't whine too much about it.

RE: unordinary shape of RC beam - reinf. detailing

You might want to consider open stirrups to facilitate placing longitudinal reinforcing.

Dik

RE: unordinary shape of RC beam - reinf. detailing

I agree that this will be tough to form no matter what and that your proposal is probably as good as any. Consider this just another option. Two pours, no need to feed main bars through close cages. Easy to consolidate.



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: unordinary shape of RC beam - reinf. detailing

Actually, I may have underestimate how small this thing is. Only about 20" wide

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: unordinary shape of RC beam - reinf. detailing

(OP)
Thanks for help. Ill consider your sketch KootK.

Also tnx to others... I think open stirrups are way to go.


EDIT: I came up with this... what do you think. making the main reinf. cage and then add the smaller one.

RE: unordinary shape of RC beam - reinf. detailing

(OP)

RE: unordinary shape of RC beam - reinf. detailing

I would go with your first proposal. The blue and yellow tie could be made into one.

I see no problem with forming the shape.

RE: unordinary shape of RC beam - reinf. detailing

Agreed with hokie, you can combine the blue and yellow stirrup and save some steel. Thinking as a precaster, if you could cast this upside down and flip it into place the forming becomes easier, but you could still cast it as drawn but pouring underneath the formwork to make the area the wood sits on will be difficult (hence KootK's idea of two pours) but it wont be impossible. The finish under there will be rough.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
https://www.facebook.com/AmericanConcrete/

RE: unordinary shape of RC beam - reinf. detailing

(OP)
How about this:

LINK: https://imgur.com/a/y32za

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