Modelling shear critical columns in OpenSees

[faraklit]

Hi,

Currently I am working on modelling a shear critical reinforced concrete column in OpenSees. As recommended, I am using additional zero length spring to apply shear deflection and shear strength degradation to column. However, I am exposed to a problem for model. When I run a pushover analysis, it seems everything is working. After peak is reached, due to strength degradation, spring governs the deflection. In that point, the load on the flexural beam-column element is decreasing and the OpenSees considers this as an unloading in the element. I don't know how to get away from this problem.
Is there any way to fix this?

[fmk]

not with how you modeled it .. OpenSees is simply enforcing nodal equilibrium!