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Verification of Circular RC Cross-Section

The program verifies a reinforced concrete pile using the method of limit deformation (Art 10.6.1). The maximum allowable strain of concrete in compression is 0.003.

The degree of reinforcement is checked using the formula:

  • Column - check for dominant compression (Art. 10.7.1)

  • Beam - check for dominant bending (Art. 8.1.6.1)

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 Vc. Formulas are from Art. 8.2.4.1, where the section width (bv) is replaced by 0.88d and effective depth (dv) is replaced 0.8*0.9*0.9d.

where (Art. 8.2.1.9, Art. 8.2.4.3):

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Vu,max and strength of reinforced section Vus are checked (Art. 8.2.5.2).

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