A Raised aisle truss has a complete aisled structure standing on a tiebeam. It has been suggested that this term should only be used when the truss has a Dropped tiebeam (Walker, 2011, 36), contrasted to a Queen-post truss with a standard tiebeam, but this is not generally agreed.
Compare drawings Aisle B and C
see also Dropped tiebeam
B) Raised-aisle truss on a tiebeam C) Raised aisle truss on a dropped tiebeam