The UA 150×90×15 is a unequal angle with a mass of 26.6 kg/m, an overall depth of 150 mm and width of 90 mm. It has a cross-sectional area of 33.9 cm², a second moment of area Iᵧ of 761 cm⁴, an elastic modulus Wₑₗ,ᵧ of 77.7 cm³, tabulated by CivilAxis from BS EN 1993-1-1:2005 / BS EN 10056-1:1999 (SCI P363 Blue Book).
Mass
26.6 kg/m
Depth
150 mm
Width
90 mm
Area
33.9 cm²
Ask about capacity, buckling or detailing for UA 150×90×15.
UA 150×90×15 section properties to BS EN 1993-1-1:2005 / BS EN 10056-1:1999.
Geometry
Depth of section
h
150
Width of section
b
90
Web thickness
tw
15
Flange thickness
tf
15
Root fillet radius
r
12
Toe radius
r2
6
Mass and area
Mass per metre
mass
26.6
Cross-sectional area
A
33.9
Bending about the major axis (y-y)
Area moment of inertia about y-axis
Iy
761
Elastic section modulus about y-axis
Wel,y
77.7
Radius of gyration about y-axis
iy
4.74
Bending about the minor axis (z-z)
Area moment of inertia about z-axis
Iz
205
Elastic section modulus about z-axis
Wel,z
30.4
Radius of gyration about z-axis
iz
2.46
Principal axes
Area moment of inertia about u-u (major principal) axis
Iu
841
Area moment of inertia about v-v (minor principal) axis
Iv
126
Radius of gyration about u-u axis
iu
4.98
Radius of gyration about v-v axis
iv
1.93
Elastic section modulus about u-u axis
Wel,u
77.7
Elastic section modulus about v-v axis
Wel,v
30.4
Torsion and warping
Torsion constant (St Venant)
It
26.8
Detailing dimensions
Centroid distance from back of leg (y)
cy
5.21
Centroid distance from back of leg (z)
cz
2.23
Common questions about UA 150×90×15
UA 150×90×15 has a mass of 26.6 kg/m, tabulated to BS EN 1993-1-1:2005 / BS EN 10056-1:1999. A 12 m length therefore weighs about 319 kg, which is the figure to use for a steel take-off or when checking a lift.
UA 150×90×15 has a depth of 150 mm, a width of 90 mm, a web thickness of 15 mm, a flange thickness of 15 mm, with a cross-sectional area of 33.9 cm². These are the nominal dimensions from BS EN 1993-1-1:2005 / BS EN 10056-1:1999; rolling tolerances apply to the delivered section.
The elastic section modulus about the major axis, Wel,y, is 77.7 cm³. Angles are tabulated about their principal (u-u and v-v) axes rather than a plastic major-axis modulus, so the elastic value is the one to design from unless you are working from the principal-axis properties directly.
The second moment of area about the major axis, Iy, is 761 cm⁴, and about the minor axis Iz is 205 cm⁴. Iy is the value deflection depends on - for a simply supported beam under a uniform load, the midspan deflection is 5wL⁴/384EIy - so on spans where a deflection limit governs rather than strength, this is the number that decides the section.
iy is 4.74 cm about the major axis and iz is 2.46 cm about the minor axis. Column buckling is governed by the SMALLER value: the slenderness is lambda = L_cr / i, so with iz = 2.46 cm a 0.2 m effective length already gives lambda = 100. Minor-axis buckling almost always controls unless the weak axis is restrained.
The St Venant torsion constant It is 26.8 cm⁴. Closed sections carry torsion in a shear flow around the perimeter, which makes them far stiffer in torsion than an open section of the same weight and is usually why one is specified.
