Design Considerations

The main design requirements for flexural members are listed in Table 4.1.

Flexural members have to satisfy the relevant design rules and requirements of EC5 [1], and the limit states associated with the main design effects are given in Table 4.1. The equilibrium states and strength conditions (i.e. bending, shear and bearing) relate to failure situations and are therefore ultimate limit states, whereas the displacement and vibration conditions relate to normal usage situations and are serviceability limit states. If, however, a design condition is able to arise where a displacement could result in structural collapse, ultimate limit states would have to be checked for the largest design effects arising from the application of the fundamental combination of actions referred to in 2.2.24.

Small deflection bending theory is taken to apply and limitations on permissible deviations from straightness must comply with the criteria given in Section 10 of EC5.

Table 4.1 Main design requirements for flexural members and the associated EC5 limit states

Design or displacement effect

EC5 limit states

Retention of static equilibrium (sliding, uplift)

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