GEO5 software

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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. The maximum allowable strain of concrete in compression is 0.002 - 0.0035. Compression reinforcement is not taken into account. Minimum eccentricity is applied:

The computed degree of reinforcement is checked using 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| / |0R|. Where L is load and R is strength with prescribed excentricity.

Bending without normal force

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

The permissible moment for a given area of reinforcements As reads:

The program further checks whether the location of neutral axis x is less than the limit location of neutral axis xmax given by:

xmax = 0.53d

- for steel Fe 250

xmax = 0.48d

- for steel Fe 400

xmax = 0.46d

- for steel Fe 500


First, the program computes the ultimate shear strength of concrete Vuc.

where: τc is determined according to table 19 standard IS 456 : 2000.

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Vuc,max is checked.

where: τc,max is determined according to table 20 standard IS 456 : 2000.

Next, the necessary reinforcement area is given by:


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