Beam Calculation

[roadkingreggae]

I hope someone can help thro the calculation necessary to determine the size of an I beam or other section. 20 years ago I used to do it but no longer remember. So if I have a beam say 3000 mm long supported at each end and want to apply a UDL of 1500 kg can you take me thro it step by step please. Thanks very much.

 

[dbuzz]

Roughly...
1. Factor design actions, say by 1.5:
w = 15 kN/m
w* = (1.5)x(15) = 22.5 kN/m
2. Calculate design action effects:
M* = [(22.5)x(3)^2]/8 = 25.3 kNm
V* = [(22.5)x(3)]/2 = 3.8 kN
3. Choose trial section
4. Check section capacity, i.e. will memeber yield
5. Check member capacity, i.e. will member buckle
6. Check moment and shear interaction
7. Calculate deflection
d = (5 x w x L^4)/(384 x E x I)
8. Check against allowable deflection, say L/250