Verification of rectangular cross-section made from plain concrete

The cross-section is rectangular, loaded by the bending moment M, normal force N (applied in the cross-section centroid) and by the shear force Q. The cross-section bearing capacity subjected to bending moment is given by (Art. 5.2.5):

The shear strength is provided by (Art. 5.3.3, Appendix 9):

Strength of concrete cross-section subject to the combination of bending moment and normal force is derived from the following expressions depending on the normal force eccentricity e(Art. 5.2.5):

for:

The ultimate bearing capacity is checket using the following formula (čl. 5.2.5.5):