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: | Dp | - | 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 eccentricity.
Shear
First, the program computes the ultimate shear strength of concrete Qbu (Art. 5.3.3, Appendix 9). Formulas are from Art. 5.3.3, Appendix 9, where the section width (b) and effective depth (d=he) are replaced according to option shear of circular piles.
where: | for: | b ≥ 0.3m | is: κq = 1.25 |
for: | b > 0.15m | is: κq = 1.50 | |
for: | b < 0.15m | is: 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:
