Partialy fixed bar buckling lenght problem

[Anonymous]

Hi community! 

I would like to make truss, which braces have elastic releases. To get right buckling length is a problem. I use automatic buckling length for member type, however I do not get desired results. In my knowledge buckling length should be between 0,5*L(brace) and 1*L(brace). But result shows 10 times bigger number. 

In addition I have little rigid link between the brace and chord.

In case needed, model is added to the attachment. (2017)

Is automatic buckling member right thing to use in this situation? 

Thanks for you attention. I'm looking forward to your reply.

Sander 

[Romanich]

Hi @Anonymous,

I would not recommend to use automatic buckling member for this situation.

[Anonymous]

Hi @Romanich

Could you suggest any other method or should I just calculate buckling length by hand and then add to the model(bars)?

Sander

[Artur.Kosakowski]

Hi @Anonymous 

As @Romanich suggested the auto option is not recommended for your situation as it is designed for typical regular beam to column connections as demonstrated on the below slide from the 3rd Robot webinar:

 

For the bar as on your picture you can use one of these options instead:

 

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