Flat plate design

[hoshang]

Hi
Please find the attached image. How one use edge beams for the flat plate perimeter considering positions of lift and stair?

 

[rapt]

Hoshang,

Are you suggesting you ignore punching shear checks at the 1st interior column as it is under strength. So it potentially fails. And Integrity reinforcement then provides the capacity required? If that is your suggestion, NO! Integrity reinforcement is an attempt at preventing catastrophic collapse of the whole structure due to the failure of one member. The structure has still failed and is not usable. Just hopefully does not kill too many people.

And depending on the code you are using, it may not even achieve that.

 

[hoshang]

RE the title (Flat plate design):
If one wishes to use drop panels rather than edge beams, what dimension should be used at the cantilevered slab of stair landing? FYI, the spacing between stair columns is 4.3m C/C, others are 7m C/C. How one can manage drop panel dimensions for the columns above lift in the OP? If there are reentrant corners, how one can manage drop panels dimensions?

 

[hoshang]

Hi,
any help would be highly appreciated.

 

[BulbTheBuilder]

If one wishes to use drop panels rather than edge beams, what dimension should be used at the cantilevered slab of stair landing?

I would refer you to ACI 8.2.4 for drop-panel.

Refer Chapter 22 of ACI for strength calculations.