W 840x400x329

Production class: hot rolled (ASTM A 6/A 6M)

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):

41900mm²

Surface area per meter:

3.254m²/m

Torsion constant (I_t):

1.159E7mm⁴

Warping constant (I_w):

5.991E13mm⁶

Profile overview for W 840x400x329

The W 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 ASTM A 6/A 6M 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 41900 mm² and a linear mass of 329 kg/m, the W 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 W 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.