continuous steel beam with 4 spans

huangyhg

continuous steel beam with 4 spans
i was looking for a simple program which i could use to determine maximum moments in a continuous steel beam with various loading conditions(both uniform and point loads).
the 48' beam would be used for a residential girder, with 4-12 foot spans. point loads are carried down from the second floor & roof, and uniform loads will vary through the length.
thanks for help.(especially for any freeware or demo programs).

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poseiden,
check out these discussions:
try out staad.beam (
enercalc is great, inexpensive and user-friendly.  staad is great but more expensive and not always user-friendly for beginners, in my opinion.  my younger engineers mis-use staad repeatedly and it's a challenge to keep up with their mistakes.  don't have as much problem with their use of enercalc.  
the freeware, "beamboy" will do exactly what you ask and is very easy to use. here is a link
thanks all!
your responces are a great start. i'm going to start reviewing them now. i like starting with the "easy & free" ones first, since i don't get involved with steel that often - mostly just simple beams & columns.
thanks slideruleera-
i tried beam boy and it seems just the ticket!
i really don't need,at this time, the more involve analyses using the other programs. beam boy was easy to use and handles variable loading conditions.
by the way, i like the photos of the slide rules. i also use to use one (k&e), which i've learned to use most of the scales. what a difference with computers!