topic Re: SLS Check (Deflection and Crack) in Robot Structural Analysis Forum

SLS Check (Deflection and Crack)

TienDat.NGUYEN.Engineer — Fri, 22 Oct 2021 11:34:18 GMT

Can anyone know how module Robot in panel calculation can calculate the reinforcement only ? I use the Panel module but the result for crack and deflection is nothing.

I don't know is there any thing missing in my calculation.

In this case only the flexural reinforcement is shown:

But the crack and deflection is none ?

Re: SLS Check (Deflection and Crack)

Krzysztof_Wasik — Fri, 22 Oct 2021 13:40:28 GMT

Hi @TienDat.NGUYEN.Engineer

Have you defined SLS combinations? Deflections and Cracks are calculated when SLS combinations are selected for verification. Share zipped RTD file for verification.

Re: SLS Check (Deflection and Crack)

TienDat.NGUYEN.Engineer — Sat, 23 Oct 2021 02:44:50 GMT

Dear @Krzysztof_Wasik ,

Yes I have defined the SLS combination (201), and both ULS (101) & SLS (201) is defined in the calculation of panel as shown in below:

But only the value in ULS show the results, for SLS it will appear this error message and the value is zero for all.

I also attach the model Robot, if possible could you please help me to check this point, thank you in advance for your help.

Re: SLS Check (Deflection and Crack)

Romanich — Sat, 23 Oct 2021 04:32:24 GMT

Hi @TienDat.NGUYEN.Engineer ,

You should assign correct SLS type:

Or in the table:

Re: SLS Check (Deflection and Crack)

TienDat.NGUYEN.Engineer — Sat, 23 Oct 2021 08:43:44 GMT

Dear @Romanich ,

I have tried to change to SLS-Quasi permanent but the result is still zero the same as below.

Did you check on the model on your side ? Does it have the result ? Thanks in advance

Re: SLS Check (Deflection and Crack)

Romanich — Sat, 23 Oct 2021 09:00:12 GMT

Hi @TienDat.NGUYEN.Engineer ,

Maybe the reason is that you have a span 1.1 m and 200 mm slab thickness. For example, I have applied supports to have the bigger span:

Re: SLS Check (Deflection and Crack)

TienDat.NGUYEN.Engineer — Sat, 23 Oct 2021 09:50:40 GMT

Dear @Romanich ,

I think so, I try like you proposed and they have the result but not same as you. And for crack width still has no result

Could you please upload the modified model ? I can study on this one.

Re: SLS Check (Deflection and Crack)

Romanich — Sat, 23 Oct 2021 11:28:55 GMT

Hi @TienDat.NGUYEN.Engineer ,

Model attached (Robot 2022)

Re: SLS Check (Deflection and Crack)

Krzysztof_Wasik — Sat, 23 Oct 2021 21:50:09 GMT

Hi @TienDat.NGUYEN.Engineer

You have too small loads to obtain cracks for defined slab geometry and loads. Cracks appears when you increase loads in your model. I have increasd live loads to 150 kN/m2. Then X- cracks are 0.2 mm.