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RC Column N-M Interaction (EC2)

Ref: MS EN 1992-1-1:2010, Clause 6.1, Malaysia NA

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N-M interaction from rectangular stress block (λ = 0.8, εcu = 0.0035)

Ref: MS EN 1992-1-1:2010, Clause 6.1, Malaysia NA

Simplified rectangular stress block (EC2 Cl. 6.1): λ = 0.8, η = 1.0, εcu = 0.0035. γc = 1.5, γs = 1.15, αcc = 0.85. Symmetric reinforcement (2 faces).

Section & Steel

Horizontal dimension (bending axis direction)

Dimension in bending plane

Nominal cover + link dia + bar radius. Typical 40–60 mm

Total rebar area on face nearer to compression

Total rebar area on tension face

Materials

25, 30, 35, or 40 MPa

500 MPa (H-bar, Malaysia)

Applied Load Point (optional)

ULS axial load (compression positive)

ULS bending moment at critical section

N-M Interaction Diagram

3341-1365334M (kN·m)N (kN)

Key Points

Nmax (pure compression)

3405.2kN

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Nbal (balanced)

880.9kN

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Mbal (balanced moment)

304.8849kN·m

Engineering aid only — final design must be endorsed by a registered PE under BEM.

M₀ (pure bending)

210.8723kN·m

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Steel Check

As,min

469mm²

Engineering aid only — final design must be endorsed by a registered PE under BEM.

As,max (4% Ac)

4800mm²

Engineering aid only — final design must be endorsed by a registered PE under BEM.

Disclaimer: This output is an engineering calculation aid only and does not constitute a final or endorsed design. All designs submitted to Malaysian authorities must be endorsed by a registered Professional Engineer (PE) under the Board of Engineers Malaysia (BEM) in accordance with the Registration of Engineers Act 1967.