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Verification of Rectangular Cross-Sections 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:

The shear strength is provided by:

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:

for:

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 excentricity and R2 is strength with prescribed normal force.