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UB 1000x400x321

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
990mm
Width (b):
400mm
Web thickness (tw):
16.5mm
Flange thickness (tf):
31mm
Radius (r):
30mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
6.964E9
Z-axis:
3.312E8
Elastic section modulus (Wel):mm³
Y-axis:
1.406E7
Z-axis:
1.656E6
Plastic section modulus (Wpl):mm³
Y-axis:
1.579E7
Z-axis:
2.554E6
Radius of gyration (i):mm
Y-axis:
412
Z-axis:
90
Plastic shear area (Av):mm²
Y-axis:
24800
Z-axis:
18450
Weight per meter:
321kg/m
Area (A):
40880mm²
Surface area per meter:
3.495m²/m
Torsion constant (It):
1.033E7mm⁴
Warping constant (Iw):
7.602E13mm⁶

Profile overview for UB 1000x400x321

The UB 1000x400x321 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 990 mm and a flange width (b) of 400 mm, supported by a 16.5 mm thick web and 31 mm thick flanges. With a cross-sectional area of 40880 mm² and a linear mass of 321 kg/m, the UB 1000x400x321 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 6964400000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 15790000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 331200000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 1000x400x321 provides a y-axis shear area (at strong bending axis) of 24800 mm² for web shear verification and a torsion constant of 10330000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 76020000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.