huangyhg

locomotive shed
has anyone ever designed a shed (pre eng rigid frame)for a 300,000 lb locomotive. for overnite storage and minor repairs. two sets of tracks for two machines. one set straddles a 30 ft concrete pit for access to the underside
no turntable?
mike mccann
mmc engineering
no turntable this is a small local siding . shed is for overnite storage only
why would the design of this shed differ from any other just because it is over a rail line?
i got the impression the pit is part of the project - particularly copnsidering taking the lateral kick of any mainframes and the resulting hole in the slab.
mike mccann
mmc engineering
i wonder if you might get more specialized help in the railroad engineering forum.
mike mccann
mmc engineering
mike,
the hole wouldn't affect how i would design the shed, because i would never depend on the slab, and rarely depend on tension ties.
he was talking about a rigid frame hokie which generates a horizontal thrust needing hairpins or tension ties or specially designed footings. as i see it, depending how close the hole is to the edge of the building, this could be affected... ??????????????
mike mccann
mmc engineering
yes, i know that. of your three methods, i always use "specially designed footings". a two pile group or a mass concrete footing. hairpins, ugghh!
rittz-
what are your concerns regarding design? i look at this as a building with a pit. not an uncommon thing. the pit walls and foundation will be large to accomodate the locomotive, but the building will not be excessively wide or tall so the base reactions will be reasonable.
post your concerns and i'm sure you'll get more focused help.
to answer cwt... the rails are to be supported on a on concrete pad (7 ft +/- wide and 16" +/- thick x 200 ft long) which in turn is supported on 3 ft +/- engineered fill (which will replace the exsiting highly pastic clay). the pit is about 24 fit long somewhere along the long pad describe described above. the rails are supportd on the pit walls (12" or so thick) which are supported by a raft slab (24 ft x 7 ft+/-wide) 7 ft below. obviously the locomotive produces a moving (slowly) point load on the walls. i'm struggling a bit with the compression in the walls and the moment in the pit base as it accepts the point load and reacts as a distributed load. there will also be a slight briging where the rail pad described above meets the pit wall (over the backfill of the pit wall).

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