Verification of rectangular cross-section made of 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 V. The cross section bearing capacity subjected to bending moment is given by (Art. 20.4.2, 2.2.2):
The shear strength is provided by (Art. 20.4.3):
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 ≥ 0.05D (Art. 10.1.2, 20.4.2, 2.2.2):
where:
Interaction diagram N-M
Usage ratio of concrete cross section subject to the combination of bending moment and normal force is determined as |0L| / |0R1| or |1L| / |1R2|. Where L is load, R1 is strength with prescribed eccentricity and R2 is strength with prescribed normal force.