joint offsets

[Zeeshanbhat]

Dear Team,

How can I provide joint offsets in STKO as there is no option of joint offsets

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as it is in in OpenSees

geom.PNG (4.93 KiB) Viewed 3972 times

Regards,
Zeeshan Bhat

[marafini.f]

Dear Zeeshan,
the joint offset is available in the physical property.
You can see it at the end of the attributes available in the elastic section, or in the rectangular fiber section, or in the fiber section.
Let me know if you find them.
Enjoy your modelling
Francesca

[Zeeshanbhat]

Thank You Francesa. But the offset command that is available in fibre or elastic section is section offset not joint offset.
Please correct me if I am wrong.

Regards,

Zeeshan Bhat

[Zeeshanbhat]

Gentle Reminder

[marafini.f]

Dear Zeeshan,
sorry our offices were closed the last two weeks.
In reference to the joint offset you want to apply. We did not include it as an option in STKO, but you can check the following tutorials on how to create joint offsets either manually or with the automatic RC joint element.

https://asdeasoft.net/?webinar
https://www.youtube.com/watch?v=l6ZIhiROfLU

What application are you trying to use the joint offset for?

Francesca

[Zeeshanbhat]

Thank you Francesa,

I am trying to model the beam-column joint as per ASCE 7, where it is recommended to provide the rigid joint offsets as per the following condition.

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Regards,
Zeeshan Bhat

[Zeeshanbhat]

Dear Francesa,

Are you planning to include this rigid offset option in the next version?

Regards,
zeeshan

[marafini.f]

Dear Zeeshanbat,

here is an example of how you can include the joint offset you are discussing.

joints.zip

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You need to use the RCJointModel special purpose and RCJointModel3DElement to achieve what you want. You need to define a stiff material with a very large E to simulate the rigidity you want and then assign a penalty parameter in the joint material to attach the beam with the column.

You can look at the links I sent you for more information on it.

Enjoy your modelling
Francesca

[Zeeshanbhat]

Dear Francesa,

Thank you for your suggestion. But I guess using the JOINT offset command already available in OpenSees would have been way better if it has been made available in STKO. Because using such high stiff material may turn the matrix ill-posed.

Regards,
Zeeshan Bhat

[marafini.f]

If you defined the high stiffness in reference to the order of magnitude of stiffness you have in your model you can avoid numerical problems of convergence or ill conditioned models

We will discuss if including the joint offset in the future anyway.

Thank you for your input.
Enjoy your modeling.
Francesca