Google is your friend.
I searched for the term "ai_keepragdolls".
It found your post on facepunch within the top 5, in which someone said they thought Ragdolls were client side.
Makes sense. Ragdolls could lag a server. It's why the limit for them not be too high.
Now, on page 2 of the search results, I found code for something called Z-day project.
http://zday.googlecode.com/svn-history/r492/trunk/gamemode/init.luaWITHIN that are TWO commands, including the ai_keepragdolls.
The second will probably help out in keeping ragdolls on the server.
"ai_keepragdolls 1"
"ai_force_serverside_ragdoll 1"
If that doesn't work, no idea what else to suggest at this point.
Good luck, and if it works, you're welcome.