That’s what my report would state for any type of floor framing (even a shed) for any end of a joist framed into the side of a beam (girder) or ledger. Nailing only is not permitted: nails are subject to withdrawal and tend to split the joist.
Joists are required by today’s standards to be supported by bearing on beams or piers, or by ledgers, or hangers.
IRC 2006 (2009 is unchanged I believe)
R502.6 Bearing. The ends of each joist, beam or girder shall
have not less than 1.5 inches (38 mm) of bearing on wood or
metal and not less than 3 inches (76 mm) on masonry or concrete
except where supported on a 1-inch-by-4-inch (25.4 mm
by 102 mm) ribbon strip [balloon framing only] and nailed to the adjacent stud or by the use of approved joist hangers.R502.6.1 Floor systems. Joists framing from opposite
sides over a bearing support shall lap a minimum of 3 inches
(76 mm) and shall be nailed together with a minimum three
10d face nails. A wood or metal splice with strength equal to
or greater than that provided by the nailed lap is permitted.
R502.6.2 Joist framing. Joists framing into the side of a
wood girder shall be supported by approved framing
anchors or on ledger strips not less than nominal 2 inches by 2 inches (51 mm by 51 mm).