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Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

(OP)
Hi dear all,

I'm a recently graduated engineer working on his first "big" building project (low rise builiding). I have been engaged in discussions with the architect and senior engineer over the follwing topic:

Balcon1.jpg shows a plan of the architectural layout, where you can see a cantilever beam on the edge of the balcony which is eccentrically embedded to a r.c. wall (see Balcon2_LI.jpg). The solution proposed here where those shown in Sol1.png (proposed by a senior engineer).

On Sol2.png is show the ideal structural layout, which is what the architect wants.

Is it possible to detail and design this beam as shown is Sol2.png ? Would using stirrups for torsion be the only major consideration to provide embededment? Any comments are welcomed.

Obviously Sol1.png looks more healthy but I wondered if Sol2.png is possible considering that in this particular case those middle walls are not continuous to the base, so the edge beams kind of support this walls and the slab on some stories. If the beams only supported the balcony I wouldn't be really afraid.

Any tip is welcomed, thanks.

Regards.





RE: Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

(OP)
Any thoughts?

RE: Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

Might repost using jpg images - we can't, at least, open rar files, or won't.

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RE: Balcony R.C. cantilever deep beam, eccentrically continuous to shear wall

Option #2 can be made to work. I would consider at least:

1) beam torsion as you've mentioned.

2) slab and/or wall weak axis bending required to resist the beam torsion.

3) One way beam shear considering that only part of the beam cross section has direct bearing.

4) Form work constructability issues.

I didn't understand your comment regarding the "middle" wall so I can't speak to that.

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.

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