RE: Compression steel and Tension Steel - Reinforced beam for flexural bending

[GB1000]

Hi...

I'm not sure this is even possible and whether its correct. I'm designing a tilt panel with mesh on each face. When checking this for flexural bending if the compression steel falls within the tension zone, can this 'compression steel' be taken as tension steel as well?

I've never seen this and I'm fairly sure its incorrect.

Cheers

 

[EDub24]

If it’s fully within the tension zone I would count it as tension steel. I would reduce the yield strength of those bars depending on the calculated strain in the bar since they will likely not reach their full yield strength. You’ll probably find that the increase in moment capacity is small however due to the reduced lever arm and reduced yield strength.

 

[GB1000]

Cheers, I can't seem to see anything in the code (AS3600) to say you can't do it, but its not something I've seen done before. Strength is not the issue, its the required Ast for shrinkage and temperature effects. So need a minimum Ast.

 

[BAretired]

I believe temperature steel includes the steel on both faces of a panel.

BA

 

[GB1000]

BA - Not necessarily in AS3600

cl9.4.3 (a) states min reo in the primary direction to be not less than cl9.1.1, hence this is where the Ast comes into play.