[TheForge] moment of a beam

[Dave Mudge]

I am looking for the on-line tables or if anyone has tables or charts
for finding the safe working load limit of a specific size beam, the
"moment" of a beam.
This is a   W-18, 50 #/foot, depth of 17-5/8", span of 15feet.

If you can point me in the right direction or if you happen to know
the answer, please contact me here: dave at magichammer.net
thanks dave mudge