2) 1 bolt at each end 3) welded at each end

Given ISA=100$\times$100$\times$6

l=3m=3000mm

rvv=19.2mm

off length =0.854$\ast$lenght of strut(0.821)

Leff=KL=1$\times$3000=3000mm

Area=1167mm$^{2}$

1. Pd=Ae$\times$fcd $ \ \ \ \ \ $ Ae=1167mm$^{2}$

fcd=$\frac{fy/ymo}{\phi +[\phi^{2}-\lambda^{2}]}^{0.5}$

$\phi=0.5[1+\alpha(\lambda-0.2)+\lambda^{2}$]

$\alpha$=0.49 .. . .. . .class c for angle

$\lambda e=\sqrt{K1+K2\lambda vv^{2}+K3\lambda^{2}\phi}$

$\lambda w=\frac{L/rvv}{\epsilon\sqrt{\frac{\phi^{2}E}{250}}}$& $\lambda \phi=\frac{b1+b2/2t}{\epsilon\sqrt{\frac{\phi^{2}E}{250}}}$ …