SHS 45×45×4 - Section Properties

The SHS 45×45×4 is a steel section with a mass of 5.01 kg/m, an overall depth of 45 mm and width of 45 mm and a wall thickness of 4 mm. It has a cross-sectional area of 6.39 cm², a second moment of area Iᵧ of 17.6 cm⁴, a plastic modulus Wₚₗ,ᵧ of 9.71 cm³, tabulated by CivilAxis from EN 10219 · Continental Steel.

Mass: 5.01 kg/m
Depth: 45 mm
Width: 45 mm
Wall thickness: 4 mm
Area: 6.39 cm²

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Dimension symbols for SHS sections. Not to scale.

SHS 45×45×4 section properties to EN 10219 · Continental Steel.
Geometry
Depth of section	h	45
Width of section	b	45
Wall thickness	t	4
Mass and area
Mass per metre	mass	5.01
Cross-sectional area	A	6.39
Bending about the major axis (y-y)
Area moment of inertia about y-axis	I_y	17.6
Elastic section modulus about y-axis	W_el,y	7.82
Plastic section modulus about y-axis	W_pl,y	9.71
Radius of gyration about y-axis	i_y	1.66
Bending about the minor axis (z-z)
Area moment of inertia about z-axis	I_z	17.6
Elastic section modulus about z-axis	W_el,z	7.82
Plastic section modulus about z-axis	W_pl,z	9.71
Radius of gyration about z-axis	i_z	1.66
Torsion and warping
Torsion constant (St Venant)	I_t	28.7
Section modulus for torsion	W_t	11.3
Surface area
Surface area per metre	SA/m	0.17

Is SHS 45×45×4 strong enough?

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

Span (m)Load (kN/m)Grade

✅Passes - 57% utilised, deflection governs

Bending24%

0.8 / 3.4 kNm

Shear5%

3.4 / 65.5 kN

Deflection57%

1.6 / 2.8 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.