P-delta and Spectral load case

[rsousa_]

In a combination with a spectral load case, When I select the combination at analysis type menu, the parameter option only display Tipe of combination (CQC, ...), quadratic combination and signed combination. In The change analysis button I can change from statics to buckling, push over, ...

But in the change analysis type from case list (buttom part of the form), I can change to P-delta. Robot calculates but at the end it says

So, my question is: Is it possible to do P-delta in a combination with a spectral load case?

Regards

[Rafal.Gaweda]

Robot 2014, my way : http://screencast.com/t/PqKl9JlVw

[rsousa_]

Thanks Rafal.

My robot version is 2009. I can also do that in my robot (as i tried to explain in my previous post), but at the end of calculations it gives me that error. So my question is: Is this type of calculation possible in robot 2009?

I attached the model (it has rigid links...), so if you can check it.

 http://www.mediafire.com/?eg76g1h2uzt91i3

Regards

[Rafal.Gaweda · Accepted solution]

I do not see any problem with this file on 2009

File with results :  http://we.tl/KVT0HnWbmF

clear cfgusr folder and %temp% folder before next robot start.

[rsousa_]

Thank you rafal,

That trick of clearing both folders worked!

Regards

[rsousa_]

Rafal,

I've made 1 simple example. see attached.

I don't known any formulation that combines multimodal analysis and 2nd order effects. Multimodal analysis uses superposition principle and that is not valid for 2nd order analysis.

I guess robot will ignore spectral load case in a combination with other loads, when we run a p-delta...

please see the attached model, and tell me if i'm wrong.

Regards 

[Rafal.Gaweda]

Not considered at all in nonlinear combination.