why don't you run a non linear dynamic analysis of your wall?
It shouldn't be too complicated even if you are a beginner in that. Many expensive softwares do that (like ANSYS, DIANA), but even much cheaper ones or free ones (developed for reasearch) if you are ready to cope with no graphical user interface (sftwares called Ruaumoko or Opensees).
My favourite one is Ruaumoko (you can find some support at www.ruaumoko.forumattivo.com
) because it is much easier than opensees (support at http://opensees.berkeley.edu/community/ ... um.php?f=2