UPN 400

Production class: hot rolled (EN 10365)

Section geometry

Height (h):

400mm

Width (b):

110mm

Web thickness (t_w):

14mm

Flange thickness (t_f):

18mm

Radius (r):

18mm

Radius 2 (r₂):

9mm

Distance edge to centroid (y_s):

26.5mm

Distance shear center to centroid (y_m):

51.1mm

Distance end to measure point (u):

48mm

Flange slope:

Section properties

Moment of inertia (I):mm⁴

Y-axis:

2.035E8

Z-axis:

8.460E6

Elastic section modulus (W_el):mm³

Y-axis:

1.020E6

Z-axis:

1.020E5

Plastic section modulus (W_pl):mm³

Y-axis:

1.240E6

Z-axis:

1.900E5

Radius of gyration (i):mm

Y-axis:

149

Z-axis:

30.4

Plastic shear area (A_v):mm²

Y-axis:

3960

Z-axis:

5860

Weight per meter:

71.8kg/m

Area (A):

9150mm²

Surface area per meter:

1.18m²/m

Torsion constant (I_t):

8.160E5mm⁴

Warping constant (I_w):

2.210E11mm⁶

Profile overview for UPN 400

The UPN 400 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 400 mm and a flange width (b) of 110 mm, supported by a 14 mm thick web and 18 mm thick flanges. With a cross-sectional area of 9150 mm² and a linear mass of 71.8 kg/m, the UPN 400 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 203500000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 1240000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (I_z) provides 8460000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UPN 400 provides a y-axis shear area (at strong bending axis) of 3960 mm² for web shear verification and a torsion constant of 816000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 221000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.