1 General

This software presents design data in tabular formats as assistance to engineers who are designing buildings in accordance with EN 1993-1-1 and EN 1993-1-5 [1], and their respective National Annexes. Where these Parts do not give all the necessary expressions for the evaluation of data, reference is made to other published sources.

The symbols used are generally the same as those in these standards or the referred product standards. Where a symbol does not appear in the standards, a symbol has been chosen following the designation convention as closely as possible.

1.1Material, section dimensions and tolerances

The structural sections referred to herein are of weldable structural steels conforming to the relevant European Standards given in the table below:

Table 1.1 Structural steel products

Product Technical delivery requirements, dimensions & tolerances
Hot finished structural hollow sections EN 10210-1[2]
Cold formed hollow sections EN 10219-1[3]

1.2 Dimensional units

The dimensions of sections are given in millimetres (mm).

1.3 Property units

Generally, the centimetre (cm) is used for the calculated properties but for surface areas, the metre (m) is used.

1.4 Mass and force units

The units used are the kilogram (kg), the Newton (N) and the metre per second squared (m/s2), so that 1 N = 1 kg × 1 m/s2. For convenience, a standard value of the acceleration due to gravity has been accepted as 9.80665 m/s2. Thus, the force exerted by 1 kg under the action of gravity is 9.80665 N and the force exerted by 1 tonne (1000 kg) is 9.80665 kiloNewtons (kN).

1.5 Axis convention

The axis system used in EN 1993 is:

x  along the member
y major axis, or axis perpendicular to web
z minor axis, or axis parallel to web