Concrete slab strength?

[BerntS]

Considering casting a concrete slab with an overhang that will bear a certain load.

But I have no idea how much moment a concrete slab of, for example, 13cm reinforced with one layer of 8mm reinforcement bars can handle? 0.1KNm, 1KNm, 10KNm, 100KNm

If anyone has any rough figures on something similar, it would be interesting.

 

[anaitis]

You can't say that without knowing a bit more!
For example, where the armering is located, how much armering there is (typically specified as mm2 armering/linear meter), and the quality of the concrete and the armering.

 

[BerntS]

If you turn the question around, how should one reinforce so that the slab/beam can withstand 2 tons 60 cm from the nearest support, i.e., 12 kNm. The slab will be about 14 cm thick, about 40 cm wide, and 7 m long. I assume that if you place 10 mm reinforcement fairly high in the casting, it should work.

 

[anaitis]

At which width does the load act?
And what is the quality of the concrete and the reinforcement?

 

[BerntS]

point load, on approximately 1dm2, standard C25 concrete and regular 10mm reinforcement (unknown quality of hardware store reinforcement...)

 

[anaitis]

If I counted correctly??
A bit rusty and only have an older table available...
So 7 pieces of 10 mm reinforcement bars are needed under the intended load point.
The bars should be distributed over a width of 200 mm.
At the same time, a few (~5) bars should be placed perpendicular to the main reinforcement over the entire width of the beam at the load point, c/c ~40 mm.
Cover layer 25 mm.

 

[BerntS]

Awesome, thanks!!!!

I'm not holding you responsible, but it gives me a good indication that it should work, and your calculation suggests that I should reinforce quite a bit and distribute the force directly under the load point.