The coupling of the roof to the floor, with a rigid member, allows for both deformation of both roof and floorpan while minimizing the decrease in {HEAD ~ distance} between {TAIL ~ the roof} and floor 
The coupling of the roof to the floor , with a rigid member , allows for both deformation of both roof and floorpan while minimizing the decrease in { HEAD ~ distance } between { TAIL ~ the roof } and floor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH