Add more elements in the model but get smaller results. Why?

Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe

Moderators: silvia, selimgunay, Moderators

Post Reply
tthdl
Posts: 7
Joined: Mon Oct 31, 2022 5:22 am

Add more elements in the model but get smaller results. Why?

Post by tthdl » Fri Mar 24, 2023 2:20 am

I built a 2D RC frame. At first, the model was built 2 nodes per beam/column (1 element for 1 beam/column). The model runs well and everything was fine. Then I added more elements in the model (1 beam/column divided into 5 element) because I want to define different sections in the beam/column. The model also runs. But the results (moment, axial force and etc) in the same sections became smaller. I used the dispBeamColumn element in the model. Could anyone please tell me why? And how can I solve this? Thank you very much!

mhscott
Posts: 868
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
Contact:

Re: Add more elements in the model but get smaller results. Why?

Post by mhscott » Fri Mar 24, 2023 6:29 am

One d-b element per member will give higher internal forces than a refined mesh of multiple d-b element per member.

https://portwooddigital.com/2020/02/23/ ... mulations/

tthdl
Posts: 7
Joined: Mon Oct 31, 2022 5:22 am

Re: Add more elements in the model but get smaller results. Why?

Post by tthdl » Sat Mar 25, 2023 3:25 am

Thank you very much!

abramromero
Posts: 1
Joined: Sat May 20, 2023 8:54 pm

Re: Add more elements in the model but get smaller results. Why?

Post by abramromero » Sat May 20, 2023 8:57 pm

mhscott wrote:
Fri Mar 24, 2023 6:29 am
One d-b element per member will give higher internal forces than a refined mesh of multiple d-b element per member.

https://portwooddigital.com/2020/02/23/ ... mulations/
hello,
why would d-b element give higher internal forces? or this is a dumb question?

Post Reply