pushover curve

[nedved33]

Hi everybody
why is not there descending curve in my pushover, in other words, why slip of pushover curve do not decrease for my frame with infrmFBH.
thanks a lot

[huffte]

I wonder if your target displacement specified in the loading phases section of the pre-processor is less than the yield displacement of the structure, in which case the calculated behavior would be just as you describe. Try increasing the target displacement.

Best of luck nedved33.

[seismosoft]

In general, you will get a descending pushover curve, when (1) there are large axial loads in the columns and you have chosen to employ geometric non-linearities from the project settings (2) you do not use a large strain-hardening value for the steel material, i.e. strain-hardening <0.005 or lower.

Note also that, currently, no fibre modelling programs feature the capability of modelling shear deformations directly (as discussed in other Forum posts). However, in SeismoStruct you can nonetheless model the shear failures and the consequent loss of strength using the performance criteria and the strength degradation parameter (use a 20% value for the residual strength).

SeismoSoft Support