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Verification of Circular RC Cross-Section

The program verifies a reinforced concrete pile using the method of limit deformation (Art. 6.2.1). The maximum allowable strain of concrete in compression is 0.002 - 0.0033. The degree of reinforcement is checked using the formula:

• Column - check for dominant compression (Art. 8.5.1, Art. 9.3.1)

for steel strength grade greater or equal to 500 MPa

for steel strength grade greater or equal to 400 MPa

for steel strength grade less than 335 MPa

ρ_min is increased by 0.001 for concrete strength grade greater than C60

• Beam - check for dominant bending (Art. 8.5.1)

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 V_c:

For flexural element (Art. 6.3.3, Art. 6.3.15):

For compression element (Art. 6.3.12, Art. 6.3.15):

For tension element (Art. 6.3.14, Art. 6.3.15):

If the ultimate shear strength of concrete is exceeded, the ultimate shear strength V_max (Art. 6.3.1, Art. 6.3.15) and strength of reinforced section V_s are checked (Art. 6.3.4, Art. 6.3.12, Art. 6.3.14, Art. 6.3.15).

for h₀/b ≤ 4

for h₀/b ≥ 6

β_c = 1 for: ≤ C50

β_c = 0.8 for: ≥ C80, intermediate values are obtained using linear interpolation method.