I hope you are doing well. I am performing NL dynamic analysis by using Sap2000. I am using a macro modeling approach for the infill walls. for the infill walls, I am using the link element approach and I am stuck on the point of "how to design force displacement curve in the link element ? I have read a couple of research papers and also saw some books but I am still finding difficulties regarding this hinges. if you have time can we have a little discussion on this?