defining variable stiffnesses for a spring by writing a macro or command or whatever
 

Hello everyone,
I wonder if you could help me with how to write and run a macro(or script) in ansys 14(transient structural). I have some springs there and I want to write a program to change the stiffness of the bonds in some situation(e.g. at some critical force). Is it possible by writing just an script or there is an easier way. I would be very much thankful if you can help me.