Section Properties
Area and inertia properties of common cross-sections — inputs for beam, buckling and torsion calculations.
Second moment of area Ix416.67cm⁴
- Area A
- 50 cm²
- Section modulus Wx
- 83.33 cm³
- Radius of gyration ix
- 28.9 mm
- Second moment of area Iy
- 104.17 cm⁴
- Section modulus Wy
- 41.67 cm³
- Radius of gyration iy
- 14.4 mm
- Mass per metre in steel
- 39.25 kg/m
METHOD
How it is calculated
Rectangle: Ix = b·h³ / 12 Round: I = π·d⁴ / 64, J = π·d⁴ / 32 Tube: I = π·(D⁴ − d⁴) / 64 I-section: Ix = [b·h³ − (b − t_w)·(h − 2t_f)³] / 12 W = I / e_max i = √(I / A)
ASSUMPTIONS & NOTES
- Corner radii are ignored; catalogue values for rolled sections differ slightly.
- Mass per metre uses steel density (7850 kg/m³).
Results are for preliminary design and checking; base the final design on the governing standard and safety factors.
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