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UBP 406x406x181

Production class: hot rolled (EN 10365)

Section geometry

UBP shape
Height (h):
400mm
Width (b):
403mm
Web thickness (tw):
19.1mm
Flange thickness (tf):
19.1mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
6.449E8
Z-axis:
2.086E8
Elastic section modulus (Wel):mm³
Y-axis:
3.224E6
Z-axis:
1.035E6
Plastic section modulus (Wpl):mm³
Y-axis:
3.617E6
Z-axis:
1.588E6
Radius of gyration (i):mm
Y-axis:
168
Z-axis:
95
Plastic shear area (Av):mm²
Y-axis:
15390
Z-axis:
8382
Weight per meter:
181kg/m
Area (A):
22650mm²
Surface area per meter:
2.339m²/m
Torsion constant (It):
3.070E6mm⁴
Warping constant (Iw):
7.557E12mm⁶

Profile overview for UBP 406x406x181

The UBP 406x406x181 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 400 mm and a flange width (b) of 403 mm, supported by a 19.1 mm thick web and 19.1 mm thick flanges. With a cross-sectional area of 22650 mm² and a linear mass of 181 kg/m, the UBP 406x406x181 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 644900000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 3617000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 208600000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UBP 406x406x181 provides a y-axis shear area (at strong bending axis) of 15394.6 mm² for web shear verification and a torsion constant of 3070000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 7557000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.