relative values in UniformExcitation

Forum for asking and answering questions related to use of the OpenSeesPy module

Moderators: silvia, selimgunay, Moderators

Post Reply
kamyarsa
Posts: 14
Joined: Mon Jan 17, 2022 2:46 am

relative values in UniformExcitation

Post by kamyarsa » Sun Jul 24, 2022 8:00 am

Hello,
I want to apply earthquake loading to soil model using uniform excitation command. But, from this command, we can only obtain relative values in the results. Is there anyway to obtain the absolute values?

Thank you very much

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

Re: relative values in UniformExcitation

Post by mhscott » Sun Jul 24, 2022 12:35 pm

You will have to use multiple support excitation: https://portwooddigital.com/2021/08/29/ ... xcitation/

kamyarsa
Posts: 14
Joined: Mon Jan 17, 2022 2:46 am

Re: relative values in UniformExcitation

Post by kamyarsa » Wed Aug 03, 2022 1:48 am

Thank you very much.
In the uniform excitation pattern, the relative values obtained from all nodes are relative to the base node results ?

kamyarsa
Posts: 14
Joined: Mon Jan 17, 2022 2:46 am

Re: relative values in UniformExcitation

Post by kamyarsa » Mon Aug 08, 2022 12:58 pm

Dear professor Scott,
I would b really grateful if you could help me with this issue.

When we use uniform excitation, the values for disp, vel and accel are relative. However, if we use acceleration timeseries we can use the following command to obtain absolute values:
" recorder Node -file accel$record.out -timeSeries 1 -node 2 -dof 1 accel"

In this condition, is there anyway we can obtain the absolute values for displacements? should we define new timeseries to be added to the relative values using the upper command?

Thank you very much

Post Reply