Corotational with Elastic Beam Column Elements

[Kate_Rhoades]

Hello STKO team,

I have been working on an analysis of a building representing the 1976 UBC. I have had success with using P-delta, when I change the transfer type for the elastic-beam element property. When I try to change it to corotational, I have the following error:

Modified Ibarra-Medina-Krawinkler Model with Peak-Oriented Hysteretic Response
CorotCrdTransf3d::CorotCrdTransf3d: rigid joint zones not implemented yet
Using zero values
CorotCrdTransf3d::CorotCrdTransf3d: rigid joint zones not implemented yet
Using zero values
CorotCrdTransf3d::CorotCrdTransf3d: rigid joint zones not implemented yet

I am not sure what this error means, could you help me diagnose this issue? I have attached a copy of my model

Many thanks,

Kate

[kesavapraba]

Hi, this message appears because the rigid joint offset option for Corotational geometric transformation is not implemented in 3D case.

[Kate_Rhoades]

Ah, Ok, so for my 3D modeling I should stick to using P-delta or linear? Corotational can only be used in 2D modeling?

[kesavapraba]

Ah, Ok, so for my 3D modeling I should stick to using P-delta or linear?

It is better to use P-Delta if the drift is significant because the second-order effect can influence the bending moments in structural members.

Corotational can work only in 2D modeling?

Yes, if you use any rigid joint offsets.

[Kate_Rhoades]

Ok! Thank you for explaining this, I really appreciate it!

[kesavapraba]

You are welcome