I have a problem regarding crack control in RC slabs. I have created a SLS:QPR combination with aqequate load factors, and when i run the reinforcement calculation everything goes well. I get the required reinforcement area, aswell as deflections, but i cannot obtain crack width no matter what I do.
Can you help me, I attached the model with no results.
Isn't there anyone who knows what may cause this problem? I am not able to get crack widths either which is odd since concrete always cracks.
It cracks, but only in one node so it is hard to display map.
This is 100cm slab with RC deflection of 2mm max
I have a ground bearing slab that has no cracks. How do you explain that?
Are you suggesting that the deflection is so small that there should be no cracks?
I dropped the foundation elasticity quite a bit and got a much greater deflection but there is still no cracks. There is no way this is correct.
Thank you for that information. Looks more believable. This method doesn't take into account reinforcement or changes in the stiffness caused by cracking does it?
@Rafal.Gaweda wrote:
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If slab is situated on the soil (in Robot on elastic ground), it will not deflect deeper (even considering cracks and reinforcement) than calculated in FEM model because soil prevents this.
Bending causes deflection and since concrete can't take tensile strain, we use reinforcement. We can diminish the crack width using more reinforcement. It's not a question of deflection getting deeper. Also this is only true when the deflection is downwards which it always isn't.
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