Basic method

The conditions in the section are shown in Figure 5.4.

Note: NAD

It is assumed that EC2(1) Section implies that a should be taken Table 3 as 0.8 for biaxial bending but the NAD(1) would allow 0.85.

It can be seen from the diagram that the axial force provided by the concrete is given by

The moments about the centroid of the concrete section are given by

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