How to calculate the purlin of steel structure.
Single purlin weight =7.5* (0.16+ (0.06+0.02) *2-4*0.0025) *19.625=45.63 kg.You don't have 7.5 meters in the design bill, so you can ask about the design.
The general is not overlapped on type C purlin in terms of (can Z type), so the calculation length of single purlin is usually a span of 7.5 meters (the exact value may be deducted for each end of 10 mm).
Standard span is 7.5m, purlin is used in C160*60*20*2.5, the amount of material to the calculation of the length of the table design without 7.5m. The general budget according to material table length calculation, because there is a connection between the specific purlin purlin connecting, you look at the sample length should be greater than 7.45m; if the length is less than 7.5m connections,.
