T T

b) Open built-up sections ir c) Closed built-up sections Figure 1.1: Typical forms of sections for cold formed members

(3) Typical edge stiffeners include:

- single edge fold stiffeners or lips, see figure 1.4(a);

- double edge fold stiffeners, see figure 1.4(b).

(4) Typical intermediate longitudinal stiffeners are illustrated as follows:

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