SLS combination

[Anonymous]

When I'm trying to calculate required reinforcement for slabs, as well as beams. I get the folowing error: "Required types are not ascribed to SLS combinations. Calculations may be incorrect."

Whats wrong? 

[Andyf88]

Sorry, any idea why SLS when acting alone, compared to ULS, gives:

1. higher reinforcement

2. and why it gives reinforcement at the bottom of the slab in the area under columns, (usually expected top reinforcement only in this area)?

Thank you.

[Artur.Kosakowski]

As I wrote the algorithm is not optimized for running SLS cases only but in general:

1. Keeping cracks under the defined limit may require more reinforcement than is required to fulfill strength requirements. In addition you may see the increase of reinforcement if you mark reduction of the deflection by increase of (SLS) reinforcement.

2. In may be the attempt to increase 'cracked' slab thickness stiffness for the correction of the deflection or compression reinforcement in case you have very high bending moment.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Andyf88]

Artur,

Thank you very much, very helpful.

Regards,