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L shaped concrete slab

L shaped concrete slab

L shaped concrete slab

(OP)
For a stair landing, with the point load on the outer leg of a "L" shape piece, im fighting with if load is that of a cantilevered beam reaction back to a perpendicular span, (sim to a beam cantilevered out over another support beam) or just the reaction from the stair back to a beam stip with some the bending moment designed separately for the cantilever.

See sketch, what load would you use on the beam strip from the cantilever stair load?

RE: L shaped concrete slab

Not sure I see the difference. The beam strip has to take the load it would take without the stair, and the stair load is an addition.

RE: L shaped concrete slab

The cantilever extends to the middle of the beam strip, not to the edge. In calculating load to the beam strip, the length of cantilever and length of back span must be taken into account.

BA

RE: L shaped concrete slab

Quote (jrisbo)

sim to a beam cantilevered out over another support beam

That's how I see it, at least in a hand analysis.

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.

RE: L shaped concrete slab

(OP)
BA, KootK, thanks, thats how I am doing, just was unsure.

RE: L shaped concrete slab

(OP)
Follow up, would you design the width of the beam section to work for the flexure, and then take the shear capacity across the whole landing? Obviously as I increase the beam width, it increases the load, and thus shear. Theoretically that beam is integrated into the whole landing width, but only a section reinforced as a beam taking stair load, then the rest as a strip load.

RE: L shaped concrete slab

The beam strip should be able to resist moment and shear on its own. Alternatively, you could use a deeper beam instead of a beam strip.

BA

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