ABAQUS: Connector Response Not Matching Input

[hwa0725]

Hi all,

I am looking to use a connector element to model the semi-rigidity of a joint in a BEAM element model (BEM). The semi-rigid moment-rotation response was obtained using a SHELL element model and then idealised into the orange curve below (which I will input into the connector element to mimic the semi-rigidity of the joint in the BEM). However, when I analyse the results from the history output of the node the connector was connecting to, the yellow curve is what I am getting in return. Surprisingly, the response I am getting in return is 20% softer than what I inputted. Is there anything I am missing or doing wrong?

Thanks a mil!

Regards,

Heng

 

[FEA way]

It's hard to say without any details about the model like connector type and behavior, boundary conditions and so on. If you double-checked the inputs, it might be best to simplify the model as much as possible (even down to the connector itself with minimum necessary behavior) for debugging.

 

[hwa0725]

Hi FEA way,

It is always you, thanks very much!

I think I found the issue, I was selecting the node of a BEAM element where one end of the connector is connecting to output the section moment and rotation which is the wrong way of outputting the results.

I then replaced the node set with the wire set defining the connector and selecting the moment and rotation under the connector history output variable list. This gave me matching results. I think the rotation/moment I was using earlier from the section involved a 75% average from the adjacent element close to the node I was selecting which is why the results are lower than expected.

Thanks very much again!

Regards,

Heng