Design of built up General section by using EN 1993-1-1:2005 code

 Applies To 
 Version(s):CONNECT Edition
 Environment: N/A
 Area: Steel Design
 Subarea: EN 1993-1-1:2005
 Original Author:Modestas Turulis, Bentley Technical Support Group



Is it possible to design a built up General type section in STAAD.Pro by using Eurocode 3 (EN 1993-1-1:2005)?


Usually built up General sections are created in 2 ways in STAAD.Pro:

1) By creating a custom section in the Section Wizard and importing it into STAAD.Pro as a General section type;
2) By entering the sectional properties of the General type built up section in the Specification -> User Table -> User Table Manager.

Most of the design codes in STAAD.Pro can design such steel sections, however, the design is performed by considering it as an equivalent I section. Specifically, D, B, TD and TB values are used to provide the shape of that I section. Here:

D - Depth of the section
TD - Thickness associated with section element parallel to depth (usually web). To be used to check depth/thickness ratio
B - Width of the section
TB - Thickness associated with section element parallel to flange. To be used to check width/thickness ratio

These parameters are used to calculate the section class of the member.

Eurocode 3 (EN 1993-1-1:2005) is the only design code as of now, which can design General section not only as an I section, but also as some other standard section, like channel, angle, tube, etc. This can be selected by using the design parameter GST in the EN 1993-1-1:2005:

The meaning of D, B, TD and TB values for each section type can be found here.