Hi Sye,
I have two ways to apply seismic load to my model. The first way is to calculate all the sesimic loads and appy it to the member/joint directly as a load. The second way is to define the seismic parameters by input zip code and other parameters. However I found the displacement results shown from two methods are totally different. The second way has almost double displacement than the first way. Is that because the displacement has been mangified such as using Cd? I didn't find any parameters for Cd in the program.
Thanks,
Perry