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UB 840x400x299

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
856mm
Width (b):
400mm
Web thickness (tw):
18.2mm
Flange thickness (tf):
29.2mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
4.817E9
Z-axis:
3.119E8
Elastic section modulus (Wel):mm³
Y-axis:
1.125E7
Z-axis:
1.559E6
Plastic section modulus (Wpl):mm³
Y-axis:
1.268E7
Z-axis:
2.406E6
Radius of gyration (i):mm
Y-axis:
355
Z-axis:
90
Plastic shear area (Av):mm²
Y-axis:
23360
Z-axis:
16550
Weight per meter:
299kg/m
Area (A):
38220mm²
Surface area per meter:
3.241m²/m
Torsion constant (It):
8.662E6mm⁴
Warping constant (Iw):
5.322E13mm⁶

Profile overview for UB 840x400x299

The UB 840x400x299 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 856 mm and a flange width (b) of 400 mm, supported by a 18.2 mm thick web and 29.2 mm thick flanges. With a cross-sectional area of 38219.68 mm² and a linear mass of 299 kg/m, the UB 840x400x299 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 4816800000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 12680000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 311900000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 840x400x299 provides a y-axis shear area (at strong bending axis) of 23360 mm² for web shear verification and a torsion constant of 8662000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 53220000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.