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Thanks all for the insightful replies, The question was generally speaking not specifically footings or specific situation. So the little bit extra millimeters in "d" for the layer that has higher demand in flexural capacity can make the difference in some situations such as the one mentioned...

Yes that was my guess but wanted to get expert opinion Thank you for the reply

Hi, Small question, does it make a difference which rebar goes above which in a slab or a footing mesh in the xy plane? Does it depend on the rebar diameter or the length of the X or Y...

Thank you all for your helpful replies !

Thanks for the reply, So small diameter pipes dont have pressure drop noticable?

Hi, Im new to this forum and I have a question about the Pressure in the lower water tank which is supplied by gravity from the upper tank by half inch pipe in the picture below. . Thanks in advance!

Teguci great point

@Jea Thank you for the clarification,

Yes bars at the same effective depth, I'm sorry I'm not that familiar with the theory of how stress can be distributed to each bar mm2 evenly so they will yield or fail together, Can you please elaborate on that its very interesting, I imagine the concrete bond is the conduit for the stress...

Hi, Is it allowed to mix rebar diameters in flexural members like beams and ribs in a ribbed slab? What is the implications of that? Wouldn't the smaller diameter bars yield before the larger ones under loading making them useless? Thank you!

Thank you hoshang, but the 4 columns annotated in the attachment are showing up in the middle of rooms in upper floors.

Thank you BA and hoshang for your replies. BA I can see that have put bearing walls on the perimeter of the floors, but in the ground floor to roof slab I cant find the optimal interior column placement. Hoshang I think that the green columns are sufficient for the b2 floor, but the red...

pdf file is attachedhttps://files.engineering.com/getfile.aspx?folder=435f3b4f-26c9-4caf-8946-a3b25340217f&file=abutamer_concept-Model.pdf

RC system is ribbed slabshttps://files.engineering.com/getfile.aspx?folder=32f58644-dc63-4a7e-99a5-b55f84052fb9&file=abutamer_concept.dwg

dwg file is attachedhttps://files.engineering.com/getfile.aspx?folder=32f58644-dc63-4a7e-99a5-b55f84052fb9&file=abutamer_concept.dwg

"but the bearing wall on B1 lies above an open room on B2 which may be a problem." yes thats what I was asking for I will post the DWG file as soon as possible. Thanks

The thing that most concerns me is the 3 m overhang in the 1st basement slab.

From left to right, Ground floor, 1st basement, 2nd basement, The 1st basement has a terrace on the 2nd basement roof, and the ground floor has a terrace on the 1st basement roof

RC Building

Hi, Can you suggest suitable column placement for these plans, I find it difficult since the floors are shifted from each other, especially the 2nd basement floor on the far right. File is attached Thank you...