interaction problem with zerolength elements and node

[hr_park]

Dear STKO Team
Hi I have question about interation part.

I was create node to node interation to create zerolength element in abutment part and merged.
After running anlaysis, I found something strage node in "elements.tcl"
There are 31 nodes in "nodes.tcl" but in the follwing picture, element(zerolength) 32,33,25,34 have node number which is over 31.

elements.png (66.28 KiB) Viewed 4524 times

I want to fix this to element 33 have node 19, 24 not 19, 33
I think this is happed beacouse I created node to make node to node interastion for generate zerolength element 32,33,25,34 . So I think making node to node interaction not create node but create vertex to solve this problem.
How can I do that?

And I wonder why element 32,33,25,34 is defined under ndf 3 unlike other elements.
I input element 32,33,25,34's material in 4 direction(1,2,3,6) just like other zerolength element located at the top of the picture but since the ndf is defined as 3, it didnt work.

Lastly, how can I change "-orient" part from '1 0 0 1 0' to' 1 0 0 -1 0' ?

Please help me.

[STKO Team]

Dear user, sorry for the late reply but we were busy lately for preparing a new webinar.

Could you please send us the SCD file to understand your issue?

regarding the orientation for zeroLength, you need to create a new LocalAxes with the desired orientation and assign it to the interaction

[hr_park]

Dear STKO
I send a email!
Thank you for your reply

[STKO Team]

Dear user, we received your e-mail and I will answer today.
Sorry for the late response but last week we were busy with online courses

[hr_park]

Dear STKO Team

Hi it's me again!

I have some progress in my STKO modeling by modifying the tcl script which is created after Analysis running.

Now I just need to modeling in stko according to the modified script , but problems are I dont know how to chage ndf of every node and element to 6.

And there are some issues Norm delta R is to big. How I can redus norm delta R when running NormEnergyIncr?

Thank you for reading!

[STKO Team]

Dear User,

This happened when you attach zeroLength elements to floating nodes that are not part of an element (they default to 3D-U).

Now we made a change in the external solver so that it will work. That is, if your zeroLengthMaterial physical property is 3D-UR, then also the floating node will have the same.

It will be in the updated version of STKO in few days. In the meantime I prepared a wetransfer link with the updated external solver directory. Follow these steps:

1. download external_solver.zip at the following link: LINK
2. delete the external_solver directory in C:\Program Files\STKO
3. extract external_solver.zip, there you will find a new external_solver directory, copy it in C:\Program Files\STKO

Let us know if it works