UB 840x400x329

Production class: hot rolled (EN 10365)

Section geometry

Height (h):

862mm

Width (b):

401mm

Web thickness (t_w):

19.7mm

Flange thickness (t_f):

32.4mm

Radius (r):

20mm

Section properties

Moment of inertia (I):mm⁴

Y-axis:

5.358E9

Z-axis:

3.487E8

Elastic section modulus (W_el):mm³

Y-axis:

1.243E7

Z-axis:

1.739E6

Plastic section modulus (W_pl):mm³

Y-axis:

1.404E7

Z-axis:

2.687E6

Radius of gyration (i):mm

Y-axis:

357

Z-axis:

Plastic shear area (A_v):mm²

Y-axis:

25980

Z-axis:

17980

Weight per meter:

329kg/m

Area (A):

42033mm²

Surface area per meter:

3.254m²/m

Torsion constant (I_t):

1.159E7mm⁴

Warping constant (I_w):

5.991E13mm⁶

Profile overview for UB 840x400x329

The UB 840x400x329 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 862 mm and a flange width (b) of 401 mm, supported by a 19.7 mm thick web and 32.4 mm thick flanges. With a cross-sectional area of 42033 mm² and a linear mass of 329 kg/m, the UB 840x400x329 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 (I_y) of 5358200000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 14040000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (I_z) provides 348700000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 840x400x329 provides a y-axis shear area (at strong bending axis) of 25984.8 mm² for web shear verification and a torsion constant of 11590000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 59910000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.