Seismosoft | Earthquake Engineering Solutions

I put a collapse strain in the material class and then I wanted to activate it in the settings, but when doing this I found the box closed (I can't activate or unactivate it). What can I do ?
Thanks alot

The 'collapse strain' feature is intentionally deactivated in the current release, since it is not yet fully developed and tested. This is also the reason for it not to be mentioned in the Help System.

SeismoSoft Support

So how can i ask the program to feel the concrete crushing strain in the stress strain curve , since the performance criteria only make a notifacation to the concrete crushing strain.

What do you mean by "feel the concrete crushing strain"? If you mean 'deactivating the section fibre where a given value of concrete strain has been reached', then, as we said already, such feature is not available.
But, do you really need to deactivate the fibres? If you are using a model like 'con_cc' then the program is already returning close-to-zero material stress values for large values of strain (check them in the Post-Processor), hence it is as the fibre is deactivated already.
Only if were using frp-confined concrete model ('con_frp') would you need such a fibre-deactivating feature, which, however, we repeat, is currently not available.

SeismoSoft Support