EN 1993 National Annexes

The following nationally defined parameters are used.

EN 1993-1-1:2005 Eurocode 3 (generic):

The following parameters are used for design checks to EN 1993-1-1:2005 Eurocode 3.

Clause 6.1 (1)

$γ_{M0} = 1.00$, $γ_{M1} = 1.00$ and $γ_{M2} = 1.25$

Clause 6.3.2.2.

Table 6.3 is used for imperfection factors.

Clause 6.3.2.3 (1)

$λ_{LT,0} = 0.4$, $β = 0.75$ and table 6.5 of EN 1993-1-1:2005 are used for the lateral torsional buckling curve. For the sections not available in the table, buckling curve d is used.

Clause 6.3.2.3 (2)

$f = 1-0.5(1-k_c)[1-2.0(λ_{LT}-0.8)^2]$ and $f \leq 1.0$; Table 6.6 are used for the correction factor $k_c$.

Interaction factors:

Annex B is used for interaction factors. For other than doubly symmetric sections, the $λ$ value used for calculating interaction factors in any direction (say $λ_x$ or $λ_y$) is the largest value of the following three

1. $λ_x$ or $λ_y$ depending on the direction.
2. $λ_T$ for torsion.
3. $λ_{TF}$ for flexural torsion.

Table B.3 is used for equivalent uniform moment factors; steel checker assumes that the spans are loaded with uniform loading.

Effective Length:

Effective buckling lengths for flexural buckling are calculated in accordance with Table 22 of BS5950-1:2000.

BS EN 1993-1-1:2005 Eurocode 3 (GB):

The following parameters are used for design checks to the UK National Annex to EN 1993-1-1:2005 Eurocode 3.

Clause 6.1 (1)

$γ_{M0} = 1.00$, $γ_{M1} = 1.00$ and $γ_{M2} = 1.10$

Clause 6.3.2.2.

Table 6.3 is used for imperfection factors.

Clause 6.3.2.3 (1)

For rolled sections and hot-finished and cold-formed hollow sections:

$λ_{LT,0} = 0.4$, $β = 0.75$

Welded sections:

$λ_{LT,0} = 0.2$, $β = 1.00$

Table in clause 2.17 of UK NA to EN 1993-1-1:2005 is used for the lateral torsional buckling curve. For the sections not available in the table, buckling curve d is used.

Clause 6.3.2.3 (2)

Clause NA 2.18 is used to calculation modification factor, $f$.

Interaction factors:

As for Eurocode 3 (generic).

Effective Length:

Effective buckling lengths for flexural buckling are calculated in accordance with Table 22 of BS5950-1:2000.

BS EN 1993-1-2:2005 (fire) Eurocode 3 (GB):

The following parameters are used for design checks to the UK National Annex to EN 1993-1-1:2005 Eurocode 3.

...

DIN EN 1993-1-1:2005 Eurocode 3 (DE):

The following parameters are used for design checks to the German National Annex to EN 1993-1-1:2005 Eurocode 3.

Clause 6.1 (1)

                 $γ_{M0} = 1.00$, $γ_{M1} = 1.00$ and $γ_{M2} = 1.25$

Clause 6.3.2.3 (2)

                 The coefficient $f$ is calculated as for Eurocode 3 (generic).

I.S. EN 1993-1-1:2005 Eurocode 3 (IE)

The following parameters are used for design checks to the UK National Annex to EN 1993-1-1:2005 Eurocode 3.

...

NEN-EN 1993-1-1:2005 Eurocode 3 (NL):

The following parameters are used for design checks to the Netherlands National Annex to EN 1993-1-1:2005 Eurocode 3.

Clause 6.1 (1)

$γ_{M0} = 1.00$, $γ_{M1} = 1.00$ and $γ_{M2} = 1.25$

Clause 6.3.2.2.

Table 6.3 is used for imperfection factors.

Clause 6.3.2.3 (1)

$λ_{LT,0} = 0.4$, $β = 0.75$ and table 6.5 of EN 1993-1-1:2005 are used for the lateral torsional buckling curve. For the sections not available in the table, buckling curve d is used.

Clause 6.3.2.3 (2)

$f = 1-0.5(1-k_c)[1-2.0(λ_{LT}-0.8)^2]$ and $f \leq 1.0$; Table 6.6 are used for the correction factor kc.

Interaction factors:

As for Eurocode 3 (generic) .

Effective Length:

Effective buckling lengths for flexural buckling are calculated in accordance with clause 12.1.1.3 of NEN 6770.

Other checks:

In addition to the EN 1993-1-1:2005 checks, the following checks are performed.

1. Combined bending, axial and shear force is checked in accordance with the clause 11.3.1.1 to 11.3.1.3 of NEN 6770
2. Biaxial bending interaction is checked in accordance with the clause 11.3.2.1 to 11.3.2.3 of NEN 6770.

NF EN 1993-1-1:2005 Eurocode 3 (FR):

The following parameters are used for design checks to the French National Annex to EN 1993-1-1:2005 Eurocode 3.

Clause 6.1 (1)

$γ_{M0} = 1.00$, $γ_{M1} = 1.00$ and $γ_{M2} = 1.25$

Clause 6.3.2.2.

Table 6.3 is used for imperfection factors.

Clause 6.3.2.3 (1)

For rolled sections (I or H sections):

$λ_{LT,0} = 0.2+0.1(b/h)$, $αLT = 0.4-0.2(b/h)λ_{LT}^2 \geq 0$ and $β = 1.0$

Welded sections (doubly symmetric I sections):

$λ_{LT,0} = 0.3(b/h)$, $α_{LT} = 0.5-0.25(b/h)λ_{LT}^2 \geq 0$ and $β = 1.0$

Clause 6.3.2.3 (2)

The coefficient $f$ is calculated as for Eurocode 3 (generic).

Note: The coefficient $f$ is only applicable to the members without intermediate lateral restraints and no warping at the ends.

Interaction factors:

Annex A is used for interaction factors.

For other than doubly symmetric sections:

a) The $χ$ value used in interaction equations in any direction (say $χ_x$ or $χ_y$) is the smallest value of the following three

1. $χ_x$ or $χ_y$ depending on the direction.
2. $χ_T$ for torsion.
3. $χ_{TF}$ for flexural torsion.

b) Elastic verification is used in the interaction

c) The equivalent uniform moment factor is limited to $C_{mi,0} \geq 1-(N_{Ed/}N_{cr,i})$

Effective Length:

Effective buckling lengths for flexural buckling are calculated in accordance with Table 22 of BS5950-1:2000.

Elastic Critical Moment (Mcr):

For doubly symmetric I sections:

$M_{cr}$ is calculated in accordance with the Annex MCR of NF EN 1993-1-1:2005. The factors C1 and C2 are taken from Table1 and Table2 of the Annex MCR.

$M_{cr}$ is calculated in accordance with clause 6.2.1.4 of “The behaviour and design of steel structures to EC3” by Trahair et al. for the loading types not specified in the Annex MCR.

For other sections:

Elastic critical moment for lateral-torsion buckling is calculated in accordance with Annex I of EN 1999-1-1:2007

SS EN 1993-1-1:2010 Eurocode 3 (SG)

The Singapore N.A. to Eurocode 3 i.e. “EN 1993-1-1:2010 Eurocode 3 (SS)” is identical to UK National Annex to EN 1993-1-1:2005 Eurocode 3.