Seismosoft | Earthquake Engineering Solutions

I've just downloaded build 5 and now get better answers.

I'm using version 5.0.4.

<t>I'm trying to use parallel springs to represent a support element that has increasing compressive stiffness with greater deflection. I've tried three springs with a zero gap and low stiffness in one, a small gap and a bit more stiffness in the second and a larger gap with more stiffness in the ...