Analysis of Roof Trusses for Vertical Dead and Live Loads:
A total plan area for each roof truss = Span × Spacing
= 10 × 4 = 40 m2
Total load on a roof truss = 770 × 40 = 30800 N
As there are five panel points A, G, C, H, B and the load at eaves points A and B is half that of the other points we have load at each intermediate joints
W = 30800/4 = 7700 N
A load at the eaves points is half of this = 3850 N
This is shown in Figure (b).
Figure (b) : Vertical Load Analysis
tan θ = 1/2 , cos θ = 2/√5, sin θ = 1/√5