I had an interesting question the other day from a PHD engineer: Design a steel beam.
Sounds simple enough.
My approach is to check the section class (web thickness to depth ratios), check the moment capacity of the section, Shear, member strength, deflections - and you're done, on to...
Thanks Hokie, that reference to the other codes definitely helps. I was looking this up as skin reinforcing and size does not seem to be a governing factor in design. Perhaps then it's a detailing question for more practical consideration rather than design.
Much appreciated.
Let me try clarify:
The steel is 'working' in the sense that it stops crack propagation. However, it is assumed to not be working in the sense that it is assumed it is not working against bending in the beam.
So the question is why would you need a thicker bar for a 500mm (+/- 20") wide beam...
In deep beams there is a code requirement to have no bar further than 300mm from a restrained bar. As far as I know, this is a crack prevention thing. So, for example, on a 600mm deep beam, you will need one middle bar.
From the detailing code, I gather that the bar diameter is determined by the...
