We use the DAM. It's easy to use in RAM Structural System(and I'm sure other software programs as well). If you use it in software, just be sure to run an analysis once with reduced stiffness to check strength, and then be sure to re-rum the analysis without the reduced stiffness to check serviceability issues such as drift.
We have also been running the DAM when required. We have both RAM and STAAD. I have not tried to figure out the RAM DAM process but I have done a pretty good job with the STAAD implementation of DAM.
I would normally use DAM. But, will avoid it during preliminary design. I want to get my drift and deflection under control before I allow stiffness reductions.
Looks like most people are going to the DAM. It also looks like they are using software to do it. I do single story buildings and additions. My access to software is very limited due to budget constraints (I work for the federal government). I have an old version of STAAD 2D from 1999 that I use for simple frame analysis. I'm sure it doesn't meet the new requirements for P-Delta/P-delta, so I would be looking at using the 1st order analysis with B factors method and doing it by hand.
