Figure 3.16 Beam spans and loading for slenderness check

In this example the top of the beam is loaded but unrestrained (for instance, the beam is carrying a wall).

The second requirement is satisfied i.e. h < 4b = 1600 mm

In calculating / , the unrestrained length of the compression flange can be taken as the distance between points of contraflexure.

These distances, which need to be < 50b = 20 m, can be obtained from Figure 2.3 EC2 Figure 2.3.

Spans A-C are satisfactory but span C-D is not. It is too slender and the width will need to be increased, or additional lateral retraint will need to be provided.

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