Deductions for Unconnected Legs:

The net effective area (A_n) is given by the following formula

A_n = A₁ + A₂ .k

where, A₁ = Effective area of the connected leg (after deductions for holes, etc.) and

A₂ = Cross-sectional area of the unconnected leg. The value of k is determined as per the following cases:

(a) Single angle linked through one leg only

The value of k is given by

k =      3A₁/3A₁ + A₂                                                                                                             

(b) A group of angles back to back (or a single tee) connected by one leg of the angle (or by the flange of the tee Figure) to the same side of the gusset plate (Figure) .

The value of k is,

k =      5A₁/5A₁ + A₂                                                                                                               

Figure

For double angles (or tees) placed back to back and connected on each side of a gusset plate (or rolled section), no deductions for outstanding legs are made (i.e. k = 0) provided tacking rivets with solid distance pieces are provided at pitch line not exceeding 1000 mm.