Non-compatible results between Openseespy and STKO

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angieosca
Posts: 3
Joined: Thu May 05, 2022 4:57 pm

Non-compatible results between Openseespy and STKO

Post by angieosca » Thu Jul 21, 2022 7:45 pm

Dear Asdeasoft team,

I am currently working on two models in 2D in Openseespy and STKO in order to compare results and be sure of that my models in STKO are working properly. However, the results are different between both softwares. I have revised the models in STKO and I cannot find what I'm doing wrong.

I would be thankful if you could help me to find the error.

I attach one of my models, the simplest of all.
Attachments
4. Modelo palito.rar
(421.34 KiB) Downloaded 7 times

STKO Team
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Joined: Tue Oct 29, 2019 8:45 am

Re: Non-compatible results between Openseespy and STKO

Post by STKO Team » Mon Jul 25, 2022 9:03 am

The OpenSees core underneath is the same (STKO is just a GUI) so the results should be the same.
If you see differences in the output, there are differences in the input.

For example,
in your python file you put the second node at y = 1.65.
later on you declare the Lcol = 1.65 * 1000... but the node is still a 1.65.
while in STKO the node is a y = 1650

Please double check your model

angieosca
Posts: 3
Joined: Thu May 05, 2022 4:57 pm

Re: Non-compatible results between Openseespy and STKO

Post by angieosca » Fri Aug 05, 2022 7:53 pm

Dear STKO team,

I have solved the situation with the simplest model. Now I am trying to compare the results between a 2D one frame structure but the reactions at the base that I get from STKO are different from the reactions that I get from Spyder. I have checked the materials, the interactions and everything but nothing seems to be wrong. I thought it could be because I was assigning wrong the EqualDOF interaction but it seems to be right.

I wonder if you could help me out to solve this doubt.

Thank you in advance
Attachments
Ejercicio2.rar
(159.46 KiB) Downloaded 6 times

STKO Team
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Joined: Tue Oct 29, 2019 8:45 am

Re: Non-compatible results between Openseespy and STKO

Post by STKO Team » Mon Aug 22, 2022 10:58 am

You did not include this file
from seccion import *

angieosca
Posts: 3
Joined: Thu May 05, 2022 4:57 pm

Re: Non-compatible results between Openseespy and STKO

Post by angieosca » Mon Oct 03, 2022 1:18 pm

Dear STKO team,

Please excuse me for the tardiness with the file. I have updated the attached files.

Thank you in advance.
Attachments
Ejercicio2.rar
(860.86 KiB) Downloaded 1 time

STKO Team
Posts: 1346
Joined: Tue Oct 29, 2019 8:45 am

Re: Non-compatible results between Openseespy and STKO

Post by STKO Team » Mon Oct 03, 2022 3:43 pm

The results should coincide.
Please double check your inputs. This is not something that we can do for you.

Hint: I already found some differences in your fiber sections (check the B and H of column and beam) in your sections.py files... they are less that what you declare in the name and in STKO.
Also, in STKO the cover is the true cover, not the distance from the border to the center line of the rebar.
for example, if your cover is 0.05, and the stirrup diameter is 0.01 and the long rebar diameter is 0.02, then the distance of the rebar centerline from the border is cover + stirrup_diam + long_rebar_diam/2

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