Xponexus Engineering

Reinforced Concrete Column – EN 1992

Axially loaded reinforced concrete column calculator with Eurocode second-order checks, P–M interaction diagrams, fire resistance, tie spacing rules, and a printable/PDF report.

Axial & biaxial bending Second-order (buckling) Fire design PM diagram

Second-order effects Fire check

Section sketch

Column cross-section

Rectangular

400 h (mm)

400 b (mm)

Material properties

Concrete and steel grades auto-fill characteristic and design strengths.

Auto-fill

Concrete Concrete grade f_ck (N/mm²) f_cd (N/mm²)

Steel Steel grade f_yk (N/mm²) f_yd (N/mm²) E_s (N/mm²)

Cover & bars c_nom (mm) Main bar φ (mm) Tie φ (mm)

Geometry, loads & fire

Section type, effective length, axial load and biaxial moments with fire options.

Section

Section-specific dimensions are shown automatically.

Type

b (mm)

h (mm)

φ (mm) – circular

Generic A_c (mm²)

Generic d (mm)

Effective length L₀ (mm)

ULS actions N_Ed (kN) M_Ed,x (kNm) M_Ed,y (kNm)

Reinforcement options Bar diameters (comma) s_min (mm) Tie s_max (mm)

Fire (simplified) t_fire (min) k_fi,N (−) k_fi,M (−)

Second-order (buckling) settings

Simple Euler-based magnification for global P–Δ and slenderness checks (EN 1992-1-1 §5.8 style).

Stiffness E_cm factor (default EC2) k_eff stiffness factor

Frame condition γ_z,lim (slenderness trigger) Amplification limit (max δ)

Check summary

Live utilisation & PM diagram

Axial

Bending

Interaction

Second-order

Fire

Min reinforcement

Ties (EC2 §9.5.3)

Utilisation ratios

P–M diagram (major axis)

Detailed engineering report

Summary of assumptions: simplified second-order (Euler) and PM interaction model for preliminary design checks.