RC slab deflection check EC2
RC slab deflection check EC2
(OP)
hello everyone,
I have calculated the required reinforcement at the mid-span of the slab and trying to do the deflection check. At EC2-1 @ 7.4.2, i need to find ρ which is the required tension reinforcement ratio at mid-span to resist the moment due to the design loads. Is it ρ= As/(b*d) ?
I have calculated the required reinforcement at the mid-span of the slab and trying to do the deflection check. At EC2-1 @ 7.4.2, i need to find ρ which is the required tension reinforcement ratio at mid-span to resist the moment due to the design loads. Is it ρ= As/(b*d) ?






RE: RC slab deflection check EC2
Yes, ρ = As/(b*d), where As is the tension reinf't area
RE: RC slab deflection check EC2
RE: RC slab deflection check EC2
As provided= 523
length of the slab =5200mm
depth = 175mm
effective depth= 130mm
RE: RC slab deflection check EC2
http://www.concretecentre.com/PDF/5%20%20Slabs.pdf
that might be useful.
I presume that the span/depth ratio goes up for reducing steel on the basis that less steel indicates less bending moment, but that doesn't make much sense to me either, since they seem to be working on the basis of a reference stress, and similar sections with different moments and steel percentages, but equal steel stress will have similar curvatures.
What makes even less sense is that it seems to allow an infinite span/depth ratio if p = p'.
It might be worth contacting the Concrete Centre for their comment, but I'd recommend doing a proper deflection calculation, taking account of creep and shrinkage, anyway.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: RC slab deflection check EC2
I do not know if they have improved this paper since then.
Doug, I agree. Do it properly. Simplified L/D methods are a good way to end up in court!