# Design of Members for Bending Moment and Axial Force

**Notations**

**N _{Ed}:** Design norma] force

**N _{pl,Rd}:** Design plastic resistancc to normal forces of the gross cross-section

**M _{Ed}:** Design bending moment

**M _{y, Rd} : **Design values of the resistancc to bending moments, y-y

**M**Design values of the resistance to bending moments, z-z axis

_{z, Rd}:**h _{w}:** depth of a cross section

**t _{w}:** web thickness

**f _{y}:** Strength of axial compressive force available according to Section E

**Ϭ _{x,Ed}:** Design value of the local longitudinal stress

**Y _{MO} : **Partial factor for resistance of cross-sections whatever the class is

**Y**Partial factor for resistance of members to instability assessed by member checks

_{MI}:**Y**Partial factor for resistance of cross-sections in tension to fracture

_{M2}:### 6.2.9 Bending and Axial Force

#### 6.2.9.1 Class 1 and 2 cross sections

For class 1 and 2, interaction of axial force and bending moment is considered according to Eq. 6.32.

For a rectangular solid section without fastener holes M

_{N,Rd}

There is no interaction if the belowed equations are satisfied for doubly symmetrical I and H sections.

There is an interaction if the belowed equation is satisfied for doubly symmetrical I and H sections

#### 6.2.9.2 Class 3 cross sections

The maximum longitudinal stress should satisfy Eq. 6.42.

#### 6.2.9.3 Class 4 cross sections

The maximum longitudinal stress should satisfy Eq. 6.43.

Alternatifly,

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