On 18 Jan 2006 02:58:35 -0800 Nafuk wrote :
and there are lots of specs for different sized universal beams.
Looking at a 152(h) x 89(w) x 16(kg/m) beam the spec is:
1. buckling resistance for a 2.5m ub = 19.8 kNm
2. Compression resistance for a 2.5 m ub: Pcx = 529 kN, Pcy = 222 kN
etc.

Please can someone tell me what are the factors I need to look at to
meet my loading requirements.

Your bending moment is WL/8 = 15.25 x 2.5/8 = 4.77 kNm v. 19.8 limit

so a 152x89 is more than ample. A 127x76 would also be OK. Alternatively
consider a pressed steel box lintel - probably a little more expensive
but easier to handle.

--
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