forklift driver wheel load - concrete slab on grade
 

forklift driver wheel load - concrete slab on grade
i'm designing a warehouse that will have both fork lift wheel loads and rack loads on a concrete slab on grade.
i've done this kind of design before using aci 360r - design of slabs on ground.
my small dillema is that everything is set up for an axle with 2 wheels. the forklifts on this project have a single load axle with 2 wheels and just one drive wheel (no axle). i can design the slab without a problem for the loads on the load axle. but i'm not sure how to design the slab for the single driver wheel. the loads aren't real high, approximately 5 kips for the driver wheel with a surface contact area of 18 square inches.
any suggestions?
i wouldn't check the single wheel case. the axle with two wheels will control, since it will have much higher loads (it is near the fork). also, 5 kips on an industrial floor slab is no big deal.
daveatkins
agree with dave...neglect the single wheel. stress radius is too small to overlap and vertical stresses are low.