On Wed, 19 Dec 2007 12:33:10 +0000 Andy Burns wrote :
You say it's 30cm tall and wide, I assume it's an "I" shape and so is
essentially 3 strips, 30cm width, assume 1cm thick, taking the density
of steel at 7.8g/cm^3

3[sides of the I] x 30cm x 1cm x 100cm x 7.8g/cm^3 = about 70kg/m
or 490kg for the lot (1cm thickness is probably overstated)

No, the lightest 305x305UC has a 9.9mm web and 15.4mm flanges. The
heaviest 26.8 and 44.1mm! They are primarily intended for use as
columns, though (as is probably the case here) are used as beams when
headroom is a factor.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk