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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. 17.3.5.3)

  • Beam - check for dominant bending (Art. 17.3.5.2)

ρmin obrained from table 17.3.

where:

d

-

pile diameter

As

-

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.

Shear

First, the program computes the ultimate shear strength of concrete VRd1. Formulas are from Art. 17.4.2.2 - Model I, where the section width (bw) is replaced by 0.88×d and effective depth (d) is replaced 0.8×0.9×d.

where

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Vmax and strength of reinforced section Vs are checked (Art. 17.4.2.2).

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