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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 0.002 - 0.0035. Concrete strength η*fcd is reduced by ten percent due to the shape of cross-section (Art. 3.1.7).

The degree of reinforcement is checked using the formula:

  • Pile (Art. 9.8.5)

Ac0.5m2

ρmin = 0.005

0.5m2 < Ac1m2

ρmin = 0.0025m2/Ac

Ac 1m2

ρmin = 0.0025

where:

Ac

-

cross-section area of the pile

  • Column - check for dominant compression (Art. 9.5.2)

  • Beam - check for dominant bending (Art. 9.2.1.1)

where:

d

-

pile diameter

As

-

cross-sectional area of reinforcement

Standard values of coefficients ρmin, ρmax are built-in the program - these values can also be input by the user depending on the selected National annex.

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.

Shear

First, the program computes the ultimate shear strength of concrete VRd,c (Art. 6.2.2(1)). Formulas are from Art. 6.2.2(1), where the section width (bw) is replaced by 0.88d and effective depth (d) is replaced 0.8d.

where:

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength VRd,max and strength of reinforced section VRd,s are checked (Art. 6.2.3(3)).

Standard values of coefficients ν, νmax, cot θmin, cot θmax are built-in the program - these values can also be input by the user depending on the selected National annex.

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