Verification of Rectangular Cross Section Made of Plain Concrete
The cross-section is rectangular, loaded by the bending moment MEd, normal force NEd (applied in the cross-section centroid), and by the shear force VEd. The shear strength is provided by (Art. 4.3.3.2.1):
where (Art. 2.3.2.4):
Strength of concrete cross-section subject to the combination of bending moment and normal force is derived from the following expressions (Art. 5.5.1, 5.2.7.1) depending on the normal force eccentricity e:
As the greater of:
Formula expresses the strength with the linear stress-strain diagram of cross-section without the crack.
Minimal values of eccentricity are from article 4.3.7.5.
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.