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 shear strength is provided by:
is the design value of stress in concrete obtained from table 19 of the IS456 standard for degree of longitudinal reinforcement ρ = 0.
Strength of concrete cross-section subject to the combination of bending moment and normal force with eccentricity e is derived from the following expressions:
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.