I wonder if anyone can point me in the direction of a formula for calculating the maximum span of a joist?
The 'knowns' are these (I'm in the UK, by the way, so everything is in SI units):
spacing (mm) load per unit length (kN/m) fibre stress of timber (N/mm2) breadth of joists (mm) depth of joists (mm)
The 'unknown' is what maximum span would result for a given set of parameters - I assume it would be possible to derive it from the data available...
For example: joists centres: 353mm load per unit length: 0.9kN/m fibre stress of timber: 7.5N/mm2 breadth of joist: 47mm depth of joist: 200mm span of joist: ?
The reason for this is that I'm (trying to) draw up a set of tables for preliminary joist sizing (UK span tables only provide metric spacing - I'm doing a set with imperial spacing for use with alterations of old buildings).
Hope somebody can help with this one!