D5.B.3.3 Clause 6.2.8 – Bending and shear
The D-NA requires the implementation of causes 11.3.1.1 and 11.3.1.3 of NEN 6770.
Clause 11.3.1.1 (NEN 6770): Class 1 and Class 2 I-section profiles
Class 1 and class 2 I section profiles must satisfy the interaction formulae given in tables 10 & 11 of NEN 6770.
Table 10 Provides interaction checks for bending about the major axis (All necessary terms and formulae are described below):
- If Vz;s;d ≤ 0.5·Vz;pl;d and Ns;d ≤ 0.5 · a1 · Npl;d , check equation 11.3.1
- If Vz;s;d ≤ 0.5·Vz;pl;d and Ns;d > 0.5 · a1 · Npl;d , check equation 11.3.2
- If Vz;s;d > 0.5·Vz;pl;d and Ns;d ≤ 0.5 · a2 · Nv;u;d , check equation 11.3-3
- If Vz;s;d > 0.5·Vz;pl;d and Ns;d > 0.5 · a2 · Nv;u;d , check equation 11.3-4
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= | = Aw · fy;d / √3 | |
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Table 11: Provides interaction formulae for bending about the minor axis
- If Vy;s;d ≤ 0.25 · Vy;pl;d and Ns;d ≤ 1.0 · a1 · Npl;d check equation 11.3-5
- If Vy;s;d ≤ 0.25 · Vy;pl;d and Ns;d > 1.0 · a1 · Npl;d check equation 11.3-6
- IfVy;s;d > 0.25 · Vy;pl;d and Ns;d ≤ 1.0 · a1 · Nv;u;d check equation 11.3-7
- If Vy;s;d > 0.25 · Vy;pl;d and Ns;d > 1.0 · a1 · Nv;u;d check equation 11.3-8
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Clause 11.3.1.3 ( NEN 6770) : Class 1 and Class 2 Square and rectangular hollow sections
This clause requires class 1 and class 2 square and rectangular tube profiles to satisfy the interaction equations in Table 13.
- If Vz;s;d ≤ 0.25 · Vz;pl;d and Ns;d ≤ 0.5 · a3 · Npl;d check equation 11.3.22
- If Vz;s;d ≤ 0.25 · Vz;pl;d and Ns;d > 0.5 · a3 · Npl;d check equation 11.3.23
- If Vz;s;d > 0.25 · Vz;pl;d and Ns;d ≤ 0.5 · a4 · Nv;u;d check equation 11.3-24
- If Vz;s;d > 0.25 · Vz;pl;d and Ns;d > 0.5 · a4 · Nv;u;d check equation 11.3-25
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