I am trying to define a custom section in Tekla Structural Designer and I do not recognise some of the properties. What are they?

Tekla Structural Designer
Not version-specific
Tekla Structural Designer
Custom section
properties
K1
n
A
Environment
Eurocode

Question

I am trying to define a custom section in Tekla Structural Designer. There are some properties that I am not familiar with such as AL, K1w, nw, etc. (highlighted in the screenshot below). Could you please advise how these values can be calculated by the user?

 

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Answer

These are all Section Properties.
Note that the subscripts yy and zz refer to the major and minor axes.

The Westok number is a Westok identifier used for Westok section; any placeholder value not already used can be used and it does not affect the section properties.


The K and n factors come about from the SCI P202 publication “Steelwork Design Guide to BS5950-1:2000 Volume 1 Section Properties Member Capacities”. Refer to Section 3.2.6 Plastic modulus (S) for the formulae used to calculate the values. They can also be found in the interactive Blue book here.

Note that in the Blue book BS 5950 notation is used for the flange thickness- T.

The same approach to British Standards for combined bending and axial loads is used for Eurocode steel design, since this reduced plastic moduli approach is a generic method applicable to any design code. Hence the K and n factors are also listed in the European section properties database, since they are required if you add sections to the database. You can calculate these values using the formulas in SCI P202.

The AL and AG properties are Surface area properties per metre and per tonne respectively. These are listed in the Properties tables in the above document.

The Az and Ay references towards the bottom (below the K and n factors), are the shear areas of the section. These are required to deal with shear deformations in beams. These can be found in the code BS EN 1993-1-1:2005 section 6.2.6

 

When creating a Hollow Section, the property Lg is the Length per Tonne of the section.

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