USP has developed a hanger for firewalls that allows all of the wood framing to be installed prior to installing the gyp board. It looks pretty interesting. http://www.uspconnectors.com/us/products/connectors/solid-sawn-hangers/top-mount-hangers/FWH
We are very excited that the newest version of RISA 3D now has time history analysis! This opens up some new ways that we can use RISA to solve both seismic problems and Vibration problems.