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Slab thicknes and tension reinforcement. ration?

Slab thicknes and tension reinforcement. ration?

Slab thicknes and tension reinforcement. ration?

(OP)

I'm using EN 1992-1 for designig concrete elements, particulary slabs. I'm confused in deflection control, where the depth of the slab is limited by the span/depth ratio (in the cases where calculations may be omitted. This span/depth ratio is dependent on the required tension (compression) reinforcement ratio. OK, but where should I take this required reinforcement ratio, from the span or support? There are cases where the reinforcement under the support is much higher than in span.
Thank you in advance.

Drile007

RE: Slab thicknes and tension reinforcement. ration?

From Cl.7.4.2;
"Expressions (7.16.a) and (7.16.b) have been derived on the assumption that the steel stress, under the appropriate design load at SLS at a cracked section at the mid-span of a beam or slab or at the support of a cantilever, is 310 MPa.."

I take that as requiring to use the midspan reinforcement ratio.

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