Deductions:

(a)   For holes (single row rivets)

= 21.5 × 10 = 215 mm²

(b)       For unconnected leg : Area of connected leg,

A₁ = (150 - 21.5 - (10/2))  × 10 = 1235 mm²

Area of unconnected leg,

A₁   = ( 75 - (10/2)) × 10 = 700 mm²

∴          k = 3A₁/ (3A₁ + A₂) = 3 × 1235/ (3 × 1235 + 700) = 0.841

∴ Net area (An) = A₁ + A₂ k = 1225 + 700 × 0.841=1823 mm²

Load carrying capacity = 1823 × 150  = 27356 N

> 250000  ∴ OK.

Slenderness ratio λ = 1200/16.1 = 74.5 < 400 ∴ OK.

Case (b): Using Fillet Welds

Using 150 × 75 × 10 ISA angle (A_g = 2160 mm²)

Deduction for unconnected leg only (as there are no rivet holes) Using 125 × 75 × 10 ISA angle (A_g = 1900 mm²)

 Deduction for unconnected leg only (as there are no rivet holes)

A₁ =(125 - (10 /2)) × 10 = 1200 mm² ,

A₂   = (75 - (10/2)) × 10 = 700 mm²

k =      3 ×1200/(3×1200 + 700)= 0.837

 ∴         Anet = A₁+ A₂ k

= 1200 + 700 × 0.837 = 1786 mm²

Load carrying capacity of angle = 1786 × 150

= 267906 N > 250000 N.