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cd t

= area enclosed within the centre line of the thin-wall section

Therefore

By reference to Figure 3.1 it may be seen that the value of cot© may be taken NAD anywhere between the limits of 0.67 to 1.5. Table 3

To minimize link reinforcement take cot© = 1.5.

Note that this value must be consistent with the value taken for normal shear.

Eqn 4.43

Re-arranging gives

k ywd

Putting TRd2 equal to T(

Sd sw s

2AJ oote k ywd

Using mild steel reinforcement

Therefore sw S

The spacing of torsion links should not exceed —

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