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Lateral bracing for a pitched truss system Lateral bracing for a series of columns

Fig. 9.1. Examples where lateral bracing of compression members are required.

are given in Table 9.1. The equilibrium states and strength conditions relate to failure situations and are therefore ultimate limit states (ULS). There is no displacement criterion for diaphragm structures, and for bracing structures the criterion is associated with the limitation of movement of the bracing system under the effect of the combined bracing force with any other external loading (e.g. wind loading) at the ULS. There is no serviceability limit states (SLS) displacement criterion.

9.3 LATERAL BRACING 9.3.1 General

The design procedures in EC5 cover the situation where compression members function as single elements in a structure as well as the condition where they form part of a bracing system as indicated in Figure 9.1.

□oof diaphragm structure

Lateral forces on structure

Floor diaphragm structure

Lateral forces on structure

Floor diaphragm structure

□oof diaphragm structure

□ all diaphragm structure

Fig. 9.2. Floor, roof and wall diaphragms (for lateral forces acting as shown).

□oof diaphragm structure

□ all diaphragm structure

Fig. 9.2. Floor, roof and wall diaphragms (for lateral forces acting as shown).

Table 9.1 Main design requirements for bracing and diaphragm structures and the associated EC5 limit states

Element

Design or displacement effect

EC5 limit states

Bracing members

Axial stress, including the effect of lateral

0 0

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