For calculating the lengths of bars, appropriate values of cover, anchorage length and development lengths are to be used.

**Length of straight bar with hooks**

Length of straight bar with hooks

= Total length of beam – 2 x End cover + 2 x 9Ø

= Clear span + 2 x (bearing) – 2 x End cover + 18Ø

**Length of straight bar without hook**

= Total length of beam – 2 x End cover

= Clear span + 2 x (bearing) – 2 x End cover

**Length of bent up bar in beams (Fig. 2)**

H = D – 2 x Clear cover – 2 × Dia. of stirrups – Dia. of main bar

Where D is the total depth of the beam.

Length of bent up bar

= Length of straight bar – 2H + (1.42H) x 2

= Length of straight bar – 2H + 2 × 1.42H

= Length of straight bar + 2 x 0.42H

**Length of bent up bar in slabs**

Length of bent up bar Length of straight bar + 2 x 0.42H

Where H = D – 2 x Clear cover – Dia. of main bar

D is the total depth of slab

(Stirrups are not provided in slabs)

**Length of Stirrups in beams (Fig. 3)**

Assuming the hook at the end of stirrup bar around the main bar for a length of 12d (d is the dia. of stirrup bar).

Length of one stirrup bar = 2(A + E) + 2 x 12 x Dia. of stirrup bar

Where

A = D – 2 x Clear cover – 2 x Dia. of bar for stirrup

E = b – 2 × Clear cover – 2 x Dia. of bar for stirrup

b and D are breadth and depth of beam section

No. of stirrups = (Centre to centre of bearing / spacing of stirrups) + 1

**Length of spiral ties in columns where P is not greater than D/5 (Fig. 4)**

Length of spiral = Nπ (D + d) + 8d

Where

N = No. of complete and fractional turns

D = Internal dia.

P = Pitch of helix

d = Size of bar

**Length of Spacer bars (Fig. 5)**

Spacer bars are used to separate two rows of main bars

Length of spacer bar = b – 2 x clear cover

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