For a built-up column with lacing, what percentage of the axial load is considered as the transverse shear force (Vt) that the lacing system must resist?

The strength and size specification of a butt weld is primary specified by its:

As per IS 800, the maximum bending moment for the design of purlins can be taken as (where W is the total distributed load including wind load on purlins and L is the effective span/centre distance of supports):