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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 (Art 17.2). The maximum allowable strain of concrete in compression is 0.0035.

The degree of reinforcement is checked using the formula:

  • Column - check for dominant compression (Art.

  • Beam - check for dominant bending (Art.

ρmin obtained from table 17.3.




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 excentricity.


First, the program computes the ultimate shear strength of concrete VRd1. Formulas are from Art. - Model I, where the section width (bw) is replaced by 0.88d and effective depth (d) is replaced 0.8*0.9d.


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

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