elastic-plastic compression-only soil spring in SAP

[JasonGeng]

Anybody modelled elastic-plastic soil spring (compression only) for the underground structure in SAP?

I read the CSI analysis reference manual. By defining the link/support property can have a non-linear spring. Looking at the Wen Plasticity Property in Page 242, how can we define a compression-only spring with elastic-plastic behavior?

Heaps Thanks.

 

[Pushover]

To use the Wen Plasticity property you'd have to understand the implications/assumptions of their parametric definition, which I admit I never looked into.

If you're not looking to model any hysteretic behaviour, the simplest way is just to use the multi-linear elastic link. You can basically define any nonlinear curve you want in there (in terms of x-y, or displacement-force, coordinates); and if you wanted compression only you can just define a flat curve on the tension half of the graph.

Hope that helps