Maximum bending moment in roof purlins is taken as ______
(where W is the total distributed load and L is span)
1
\(\frac{{{\rm{WL}}}}{{10}}\)
2
\(\frac{{{\rm{WL}}}}{{20}}\)
3
\(\frac{{{\rm{WL}}}}{{30}}\)
4
\(\frac{{{\rm{WL}}}}{{40}}\)
Maximum bending moment in roof purlins is taken as ______
(where W is the total distributed load and L is span)