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 shape of cross section (Art. 3.1.7).
The degree of reinforcement is checked using the formula:
- Pile (Art. 9.8.5)
Ac ≤ 0.5m2
ρmin = 0.005
0.5m2 < Ac ≤ 1m2
ρmin = 0.0025m2/Ac
Ac ≥ 1m2
ρmin = 0.0025
cross section area of pile
- Column - check for dominant compression (Art. 9.5.2)
- Beam - check for dominant bending (Art. 188.8.131.52)
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.
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 0.88*d and effective depth (d) is replaced 0.8*d.
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.