modeling RC beam - hand calculation 3

[greznik91]

I have to design RC beams that are partly integrated into RC slab. I dont know how to model/calculate this since I dont trust FEM softwares for this kind of things since I almost made a huge mistake with something similar once upon a time.

RC beams are marked yellow and red line is a bearing masonry wall above beams. Design load on beams are approx. 50 kN/m.

Id model beam 1 and beam 4 as cantilever beams but Im wondering how much does beam 4 actually helps since load is transfered in direction of stiffnes (bearing wall above beams - red line)? Is it problematic that beam 1 and beam 2 are not in the same line? If I move beam 1 in the same line as beam 2 I cant design it as cantilever since it would be a simple supported beam. How would you model this?

 

[KootK]

I'd detail the fattening as a ledge/nib/corbel depending on location. In that scenario, the longitudinal bars in the fattening would be nominal detailing bars and I wouldn't be seeking to hook them into the main body. I'd probably seek to get all of my moment, shear and torsion dealt with within the unfattened beam section to keep things simple.

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.

 

[n3jc]

Kootk, you mean something like this right?

 

[KootK]

Yeah, that's just what I was thinking n3jc.

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.