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UB 840x400x392

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
877mm
Width (b):
401mm
Web thickness (tw):
22.1mm
Flange thickness (tf):
39.9mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
6.597E9
Z-axis:
4.296E8
Elastic section modulus (Wel):mm³
Y-axis:
1.504E7
Z-axis:
2.142E6
Plastic section modulus (Wpl):mm³
Y-axis:
1.704E7
Z-axis:
3.310E6
Radius of gyration (i):mm
Y-axis:
363
Z-axis:
92
Plastic shear area (Av):mm²
Y-axis:
32000
Z-axis:
20430
Weight per meter:
392kg/m
Area (A):
49960mm²
Surface area per meter:
3.279m²/m
Torsion constant (It):
2.026E7mm⁴
Warping constant (Iw):
7.511E13mm⁶

Profile overview for UB 840x400x392

The UB 840x400x392 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 877 mm and a flange width (b) of 401 mm, supported by a 22.1 mm thick web and 39.9 mm thick flanges. With a cross-sectional area of 49961.28 mm² and a linear mass of 392 kg/m, the UB 840x400x392 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 6596500000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 17040000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 429600000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 840x400x392 provides a y-axis shear area (at strong bending axis) of 31999.8 mm² for web shear verification and a torsion constant of 20260000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 75110000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.