Steel Column Design (EN1993): Classification of columns subject to compression only

Tekla Tedds
Not version-specific
Tekla Tedds Tekla Tedds for Word
classification
compression
part
subject
Environment
Eurocode
The Tedds calculation for the classification of web in a column is exactly the same as that adopted by CSC Fastrak and the 'Part subject to bending and compression' column of Table 5.2 (sheet 1 of 3) of EC3 is always used even if there is no moment applied to the column (which in reality would be unlikely).

Using the Tedds approach, say alpha is found to be 0.75 i.e. 3/4 of web is in compression then this apparently gives you a 'better' i.e. higher limit for say a Class 1 section than if the 'Part subject to compression' column is used so the section could be Class 1 to Tedds but Class 2 using 'Part subject to compression' and so could be deemed un-conservative. However, using 'Part subject to compression' then the applied stress would be substantially less than fy because not only would the whole of the web be considered as resisting the axial (as opposed to only half using the Tedds approach for alpha = 0.75) but also the flanges as well as these do not need to resist any moment. 
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