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Verification of Circular RC Cross-Section

The program verifies a reinforced concrete pile using the method of limit deformation (Art. 5.2.8). The maximum allowable strain of concrete in compression is 0,0025. The degree of reinforcement is checked using the formula:

  • Column - check for dominant compression (Art. 3.1.4.3, Art. 3.1.4.6)

  • Beam - check for dominant bending

where:

d

-

pile diameter

As

-

reinforcement area

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 Qbu (Art. 5.3.3, Appendix 9).

where:

for:

0.88d≥0.3m

is: κq = 1,25

for:

0.88d>0.15m

je κq = 1,50

for:

0.88d<0.15m

je κq = 1,60

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength Qmax and strength of reinforced section Qu are checked (Art. 5.3.2.1).

where (Art. 5.3.5):

The magnitude of c is bounded by the following expression: