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Verification of Rectangular RC Cross-Section

The cross-section is rectangular, unilaterally reinforced and loaded by the bending moment and normal compression force. The program verifies a reinforced concrete section using the method of limit deformation (Art. 5.2.8). The maximum allowable strain of concrete in compression is 0.0025. Compression reinforcement is not taken into account.

The computed degree of reinforcement is checked using the following expressions (Art., Art.

Interaction diagram N-M

Usage ratio of concrete cross-section subject to the combination of bending moment and normal force is determined as |0L| / |0R|. Where L is load and R is strength with prescribed eccentricity.

Bending without normal force

The cross-section is rectangular, reinforced on one side and loaded by the bending moment Md.

The ultimate moment is provided by (Art. 5.2.7):

The program further checks whether the location of neutral axis x is less than the limit location of neutral axis xlim given by (Art.


First, the program computes the ultimate shear strength of concrete Qbu (Art. 5.3.3, Appendix 9).



h ≥ 0.3m

is: κq = 1.25


h > 0.15m

je κq = 1.50


h < 0.15m

je κq = 1.60

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Qmax is checked (Art.

Next, the necessary reinforcement area is given by (Art. 5.3.4):

where (Art. 5.3.5):

The magnitude of c is bounded by the following expression:

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