Sorry
The table comes from a British standards book. showing universal, structural tees and gantry girders.
There is no cross section stated in the question(i think this is where I'm getting stuck as i have examples using the cross section).
Here is that table as well as my working of the...
Homework Statement
In cross-section, the beam you are working on is a gantry girder.The maximum bending stress in the girder must not exceed 25MN/m2 and the modulus of elasticity can be assumed to be 210GN/m2.
Determine a suitable size for the beam, selected from the standard sections tables...