FORCE VS DISP LOAD

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

Moderators: silvia, selimgunay, Moderators

Post Reply
Samra
Posts: 24
Joined: Thu Oct 01, 2015 8:18 pm
Location: neduet

FORCE VS DISP LOAD

Post by Samra » Sun Mar 19, 2017 11:38 pm

DEAR ALL,
As i do pushover analysis of a single story one bay RC frame, if for the lateral load i apply a force of 10N the pushover for the frame is different as compared to a 1 mm reference displacement applied at the same node using sp command...also both the analysis are displacement controlled to a max of 500mm displacement value.....Please help me understand the difference
the result is attached below;
https://drive.google.com/open?id=0BxvVI ... 2pWMktLeEk

fmk
Site Admin
Posts: 5883
Joined: Fri Jun 11, 2004 2:33 pm
Location: UC Berkeley
Contact:

Re: FORCE VS DISP LOAD

Post by fmk » Mon Mar 20, 2017 10:11 pm

its a different type of analysis .. to compare you want to use displacement control, add a unit ref load to the frame and then check the load factor (the time in the domain) to impose the displacement .. the time should be 10 and rotations for this result will be as the original, rotations for imposed displacements will probably not be the same (which is why the difference)

Post Reply