RHS 80×50×8 - Section Properties

The RHS 80×50×8 is a steel section with a mass of 14.11 kg/m, an overall depth of 80 mm and width of 50 mm and a wall thickness of 8 mm. It has a cross-sectional area of 17.6 cm², a second moment of area Iᵧ of 127 cm⁴, a plastic modulus Wₚₗ,ᵧ of 42.2 cm³, tabulated by CivilAxis from EN 10219 · Continental Steel.

Mass: 14.11 kg/m
Depth: 80 mm
Width: 50 mm
Wall thickness: 8 mm
Area: 17.6 cm²

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Dimension symbols for RHS sections. Not to scale.

RHS 80×50×8 section properties to EN 10219 · Continental Steel.
Geometry
Depth of section	h	80
Width of section	b	50
Wall thickness	t	8
Mass and area
Mass per metre	mass	14.11
Cross-sectional area	A	17.6
Bending about the major axis (y-y)
Area moment of inertia about y-axis	I_y	127
Elastic section modulus about y-axis	W_el,y	31.7
Plastic section modulus about y-axis	W_pl,y	42.2
Radius of gyration about y-axis	i_y	2.69
Bending about the minor axis (z-z)
Area moment of inertia about z-axis	I_z	57.4
Elastic section modulus about z-axis	W_el,z	23
Plastic section modulus about z-axis	W_pl,z	29.6
Radius of gyration about z-axis	i_z	1.81
Torsion and warping
Torsion constant (St Venant)	I_t	135
Section modulus for torsion	W_t	37.5
Surface area
Surface area per metre	SA/m	0.239

Is RHS 80×50×8 strong enough?

Simply supported beam, uniform load, major-axis bending - to EN 1993-1-1.

Span (m)Load (kN/m)Grade

✅Passes - 59% utilised, deflection governs

Bending28%

4.2 / 15.0 kNm

Shear5%

11.3 / 222.0 kN

Deflection59%

2.5 / 4.2 mm

Class 1 section. ULS uses γQ = 1.5 on the load you enter; deflection uses the unfactored load against L/360. Lateral-torsional buckling is not included - the compression flange is assumed restrained.