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. 12.6.3):
where: Acc - compressed area of concrete
k is built-in the program (Art. 12.6.3) - this value can also be adjusted in the program based on the selected National annex.
Strength of concrete cross-section subject to the combination of bending moment and normal force is derived from the following expressions (Art. 12.6.1) depending on the normal force eccentricity e:
As the greater of:
Formula express the strength with linear stress-strain diagram of cross-section without the crack.
Minimal values of excentricity are from article 6.1(3).
αcc,pl, αct,pl, γc are built-in the program - these values can also be input by the user depending on the selected National annex.
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.