I'm working with big fiber section models for my thesis. I'm running pushover and time-history analysis and I'm getting really rare results (rare deformation and base reaction about twice or more times bigger than pushover). Trying to figure out what is the trouble, I decided to see what is happening with concrete.
And working with a little model 'im getting really rare behavior for cyclic loading
all codes are here: http://www.cec.uchile.cl/~fecorder/concrete.zip
The main file is concrete04.tcl. It performs a cyclic compresion and tension analysis over a simple zerolength element to observe what is happening with the response of the material.
And I'm getting, for example for concrete02, the following response: http://www.cec.uchile.cl/~fecorder/concrete02.png
I'm working with the last OpenSees release.
Thanks for any help, especially from developers.
http://opensees.berkeley.edu/wiki/index ... _Softening
and you will see the same response.