180×18.1 UB | 180UB18.1 | Universal Beams | Section Properties | Australia NZ | Metric, SI, Imperial & US Units

The steel section 180×18.1 UB falls under the section category of Universal Beams. The section 180×18.1 UB is denoted by the Standard Industry section notation – 180UB18.1. In Australia and New Zealand, the nominal section dimensions and weights of hot-rolled sections are defined in Appendix D of AS/NZS 3679.1:2016 Structural Steel – Hot-Rolled Bars and Sections. These dimensions are used to calculate the design section properties of this section.

Summary of Geometrical and Sectional Properties of 180×18.1 UB

Section properties of 180UB18.1 in metric units and imperial units (US Customary Units) are summarised in the table below

Summary of Geometrical and Sectional Properties of 180×18.1 UB in millimetres, mm

Section properties of 180UB18.1 in millimeters, mm are summarised in the table below

Geometry of 180×18.1 UB in mm – SI units   

Total depth of section = Section depth, d = 175.00 mm

Total breadth of section = Section width, b = 90.00 mm

Flange thickness, t_f = 8.00 mm

Web thickness, t_w = 5.00 mm

Root radius, r = 8.90 mm

Total Area of section, A = 2303.00 mm² 

Mass of section, M = 18.08 kg/m 

Sectional Properties of 180×18.1 UB in mm – Metric units

The Second Moment of Area or Second Area Moment or Quadratic Moment of Area or Area Moment of Inertia or moment of Inertia about x-axis, I_xx = 12130000.00 mm⁴

The Second Moment of Area or Second Area Moment or Quadratic Moment of Area or Area Moment of Inertia or moment of Inertia about y-axis, I_yy = 975200.00 mm⁴

Radius of gyration about x-axis, r_x = 72.58 mm

Radius of gyration about y-axis, r_y = 20.58 mm

Elastic section modulus about x-axis, Z_xx = 138600.00 mm³

Elastic section modulus about y-axis, Z_yy = 21670.00 mm³

Plastic section modulus about x-axis, S_xx = 157100.00 mm³

Plastic section modulus about y-axis, S_yy = 33700.00 mm³

Warping Constant, I_w = 6799000000.00 mm⁶

Torsional Constant, J = 44760.00 mm⁴

Structural Design Parameters of 180×18.1 UB or 180UB18.1 in mm – Metric units

Based on the design application and structure type, Universal Beams are to be designed in accordance with AS-NZS 5100.6-2017 and AS 4100:2020. Another design guide available for designers is AISC – Design of Structural Connection 4^th Edition 1994 published by Australian Steel Institute.

Depth of web between flanges, d_w = 159.00 mm 

Surface area = 0.68 m²/m  

Ratio of outstanding flange/thickness of flange =  5.625

Web slenderness ratio or ratio of clear web depth/thickness of web =  31.800

Buckling Parameter of section =  0.885

Trivia – Hot-rolled Universal Beam Structural Steel Sections

Grade 300 Steel is the most common and standard grade manufactured by most manufacturers in Australia for hot rolled Structural Steel Sections. Depending on project and client demands, other grades available in the market are 300L0, 300L15, 350, 350L0 & 350L15.

Common stock lengths available in the market are 9.0m, 10.5m, 12.0m, 13.5m, 15.0m, 16.5m, 18.0m & 20.0. However, some lengths may not be available depending on the supplier. 

Hot-rolled Structural Steel Sections are usually supplied in Mill Finish. Although, other finishes are available on demand or special orders.

Universal Beams are available in section depths of 150mm, 180mm, 200mm, 250mm, 310mm, 360mm, 410mm, 460mm, 530mm & 610mm.

FAQs on 180×18.1 UB or 180UB18.1 

Data on this page has been verified and validated with multiple data sources and reviewed regularly for correctness and accuracy, if you have any comments or suggestions, please reach out to us here.