1.6. Symbols

A useful listing of the majority of symbols used in EN 1993-1-1 is provided in clause L6. Clause 1.6

Other symbols are defined where they are first introduced in the code. Many of these symbols, especially those with multiple subscripts, will not be familiar to UK designers. However, there is generally good consistency in the use of symbols throughout the Eurocodes, which makes transition between the documents more straightforward.

1.7. Conventions for member axes

The convention for member axes in Eurocode 3 is not the same as that adopted in BS 5950 (where thex-v and y-y axes refer to the major and minor axes of the cross-section respectively. Rather, the Eurocode 3 convention for member axes is as follows:

Generally, the y-y axis is the major principal axis (parallel to the flanges), and the z-z axis is the minor principal axis (perpendicular to the flanges. For angle sections, the y-y axis is parallel to the smaller leg, and the z-z axis is perpendicular to the smaller leg. For cross-sections where the major and minor principal axes do not coincide with the y-y and z-z axes, such as for angle sections, then these axes should be referred to as u-u and v-v, respectively. The note at the end of clause 1.7 is important when designing such sections, Clause 1.7

Eurocodes And Steel Section AxesEurocode Axis

Fig. LI. Dimensions and axes of sections in Eurocode 3

because it states that 'All rules in this Eurocode relate to the principal axis properties, which are generally defined by the axesy-y and 2-2 but for sections such as angles are defined by the axes u-u and v-v' (i.e. for angles and similar sections, the u-u and v-v axes properties should be used in place of they-y and 2-2 axes properties).

Figure 1.1 defines the important dimensions and axes for the common types of structural steei cross-section. Note that many of the symbols are different to those adopted in BS 5950.

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