Transverse Reinforcement - One Way In-site Concrete Slab to EC2 1

[DavAD]

Hi,

I am trying to find reference to the percentage of Transverse steel reinforcement in EC2, but I cannot seem to find it.

Anyone can direct me to this?

How much transverse reinforcement do you provide (minimum) in a one-way slab?
15% area of concrete? or any ratio to main reinforcment?

Any rule of thumb?

Very much appreciated.

Kind regards

 

[jaskamakkara]

According to How to Design Concrete Structures using Eurocode 2, The Concrete Centre:

 

[hokie66]

I wouldn't trust that reference. That amount of "secondary reinforcement" is woefully inadequate to control shrinkage cracking.

 

[jaskamakkara]

Here is the same requirement lifted from the Eurocode (EN 1992-1-1):

§7.3.3 states the following:

However, 7.3.1(3) states:

So if you have problems with shrinkage cracks then you might need to add more steel as hokie says. But there is no "rule of thumb" for calculating such reinforcement as far as I am aware. If you, hokie, have some guidance on this issue I would be interested to read it because this is a gap in my knowledge.

 

[HTURKAK]

The second post of jaskamakkara is from EC-2 ..



Although this is the code , 20% of the principal reinforcement may not satisfy the minimum shrinkage reinf. requirement. Another statement which i disagree ( In areas near supports transverse reinforcement to principal top bars is not necessary where there is no transverse bending moment )

If one way slab is continuous having span more than one, hogging moment ( negative moment ) will develop at supports and transversal reinforcement should be provided at supports and placed at the top but under the main reinforcement.

The purpose of Secondary transverse reinforcement is called DISTRIBUTION STEEL which provides tying the slab together and distributes non-uniform loads through the slab.