Correct option is D
According to IS:800, the maximum bending moment for a purlin, typically used in roofing structures, depends on the load and span of the purlin. The purlin is usually subjected to a uniformly distributed load (udl) caused by the roofing material and other loads.
For a simply supported purlin with uniformly distributed load W and span L, IS:800 suggests the maximum bending moment for design purposes to be:
BM = WL/10
Where:
W = Uniformly distributed load per unit length
L = Span of the purlin
This formula takes into account the specific boundary conditions and load distributions commonly encountered in purlin design, as per IS:800. Therefore, the maximum bending moment is given as BM = WL/10
