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Indian standard angle 100×100×6mm is used as strut iin roof truss the length of strut between entrane section at each end 8m cal the strength 1) connect two halts at each end
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2) 1 bolt at each end 3) welded at each end

Given ISA=100×100×6

l=3m=3000mm

rvv=19.2mm

off length =0.854lenght of strut(0.821)

Leff=KL=1×3000=3000mm

Area=1167mm2

  1. Pd=Ae×fcd       Ae=1167mm2

fcd=fy/ymoϕ+[ϕ2λ2]0.5

ϕ=0.5[1+α(λ0.2)+λ2]

α=0.49 .. . .. . .class c for angle

λe=K1+K2λvv2+K3λ2ϕ

λw=L/rvvϵϕ2E250& λϕ=b1+b2/2tϵϕ2E250

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