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UB 406x178x74

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
412.8mm
Width (b):
179.5mm
Web thickness (tw):
9.5mm
Flange thickness (tf):
16mm
Radius (r):
10mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
2.729E8
Z-axis:
1.545E7
Elastic section modulus (Wel):mm³
Y-axis:
1.322E6
Z-axis:
1.721E5
Plastic section modulus (Wpl):mm³
Y-axis:
1.500E6
Z-axis:
2.669E5
Radius of gyration (i):mm
Y-axis:
169
Z-axis:
40
Plastic shear area (Av):mm²
Y-axis:
5744
Z-axis:
4175
Weight per meter:
74.2kg/m
Area (A):
9450mm²
Surface area per meter:
1.507m²/m
Torsion constant (It):
6.261E5mm⁴
Warping constant (Iw):
6.070E11mm⁶

Profile overview for UB 406x178x74

The UB 406x178x74 is a structural steel cross-section utilized in commercial construction, industrial framing, and mechanical engineering. Manufactured as a hot rolled section, it complies with EN 10365 dimensional standards, ensuring predictability in detailing and fabrication.Access to its exact geometric and statical properties is essential for 3D modeling and structural verification.

Geometry: This open profile features a total depth (h) of 412.8 mm and a flange width (b) of 179.5 mm, supported by a 9.5 mm thick web and 16 mm thick flanges. With a cross-sectional area of 9450 mm² and a linear mass of 74.2 kg/m, the UB 406x178x74 offers a distinct stiffness-to-weight ratio for both column (axial) and beam applications.

Section properties: For design of bending, the major and minor axis properties dictate the member's structural capacity. The strong-axis moment of inertia (Iy) of 272900000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 1500000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 15450000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 406x178x74 provides a y-axis shear area (at strong bending axis) of 5744 mm² for web shear verification and a torsion constant of 626100 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 607000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.