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UB 840x400x359

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
868mm
Width (b):
403mm
Web thickness (tw):
21.1mm
Flange thickness (tf):
35.6mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
5.916E9
Z-axis:
3.890E8
Elastic section modulus (Wel):mm³
Y-axis:
1.363E7
Z-axis:
1.930E6
Plastic section modulus (Wpl):mm³
Y-axis:
1.542E7
Z-axis:
2.984E6
Radius of gyration (i):mm
Y-axis:
359
Z-axis:
92
Plastic shear area (Av):mm²
Y-axis:
28690
Z-axis:
19330
Weight per meter:
359kg/m
Area (A):
45850mm²
Surface area per meter:
3.271m²/m
Torsion constant (It):
1.510E7mm⁴
Warping constant (Iw):
6.726E13mm⁶

Profile overview for UB 840x400x359

The UB 840x400x359 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 868 mm and a flange width (b) of 403 mm, supported by a 21.1 mm thick web and 35.6 mm thick flanges. With a cross-sectional area of 45849.44 mm² and a linear mass of 359 kg/m, the UB 840x400x359 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 5916200000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 15420000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 389000000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 840x400x359 provides a y-axis shear area (at strong bending axis) of 28693.6 mm² for web shear verification and a torsion constant of 15100000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 67260000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.