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GEO5 Software

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Verification of Circular RC Cross Section

The program verifies a reinforced concrete pile using the method of limit deformation. The maximum allowable strain of concrete in compression is 0.003.

The degree of reinforcement is checked using the formula:

  • Pile

Ag < 0.5m2

ρmin = 2.4 / fy

Ag > 2m2

ρmin = 1.2 / fy




cross-section area of the pile

intermediate values are calculated according to:

  • Column - check for dominant compression

  • Beam - check for dominant bending




pile diameter



cross-sectional area of reinforcement

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.



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

for cross-sections with height smaller than 200mm

vc is computed according to the following formulas for cross-sections with height greater than 400mm, intermediate values are obtained using a linear interpolation method.

where ρw is the degree of reinforcement and fc' is limited to value 50 MPa.

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Vmax and strength of reinforced section Vs are checked.

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