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D5.D.5 UK National Annex to EC3

Adds values from the UK National Annex - titled NA to BS EN 1993-1-1:2005 - for use with Eurocode 3, or EN 1993-1-1:2005. The NA document makes small changes to the base document.

Note: Refer to the basic code (EC3) for a description of these clauses. The sections below refer to the corresponding clauses in the UK-NA.

The following clauses are not implemented in STAAD.Pro:

Clause 6.3.2.4(1) B – Slenderness for flexural buckling
The UK NA specifies the value of λc0 for I, H channel or box section to be used in equation 6.59 of BS EN 1993-1-1:2005 as 0.4. However, STAAD.Pro does not use this clause for design per EC-3. Therefore, this clause is ignored for the UK National Annex.
Clause 6.3.2.4(2)B – Modification factor "kfl"
The value of the modification factor kfl to be used in equation 6.60 of BS EN 1993-1-1. However, STAAD.Pro does not use this clause for design per EC-3. Therefore, this clause is ignored for the UK National Annex.

The clauses/sections in EN 1993-1-1:2005 that have been dealt with in the UK National Annex (hereafter referred to as the UK-NA) are:

D5.D.5.1 Clause 6.1(1) – General: Partial Safety Factors for buildings
D5.D.5.2 Clause 6.3.2.2 –Elastic critical moment and imperfection factors for LTB checks
D5.D.5.3 Clause 6.3.2.3(1) – LTB for rolled sections or equivalent welded section
D5.D.5.4 Clauses 6.3.2.2 and 6.3.2.3 — Calculation of LTB Reduction factor, χLT as per UK NA
D5.D.5.5 Clause 6.3.2.3(2) – Modification factor, f, for LTB checks
D5.D.5.6 Clause 6.3.3(5) – Interaction factors kyy, kyz, kzy, and kzz
D5.D.5.7 Clause 6.3.1.4 - Slenderness for torsional and torsional-flexural buckling
Parent topic: D5.D. European Codes - National Annexes to Eurocode 3 [EN 1993-1-1:2005]
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