Dimensions and section properties for HP18X181

Structural sectional properties for a HP18X181 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeHP
Section NameNameHP18X181
Cross Sectional AreaA53.2 in2
Section Widthb18 in
Section Depthd18 in
Flange thicknesstf1 in
Web thicknesstw1 in
Radius of Gyration about X-Xrx7.53 in
Radius of Gyrations about Y-Yry4.28 in
Moment of Inertia about X-XIx3020 in4
Moment of Intertia about Y-YIy974 in4
Elastic Section Modulus about X-XSx336 in3
Elastic Section Modulus about Y-YSy108 in3
Plastic Section Modulus about X-XZx379 in3
Plastic Section Modulus about Y-YZy167 in3
St. Venant Torsional ConstantJ20.7 in4
Warping Torsion ConstantCw70400 in6
Self Weight of sectionWeight181 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeHP
Section NameNameHP18X181
Cross Sectional AreaA34323 mm2
Section Widthb457 mm
Section Depthd457 mm
Flange thicknesstf25.4 mm
Web thicknesstw25.4 mm
Radius of Gyration about X-Xrx191 mm
Radius of Gyrations about Y-Yry109 mm
Moment of Inertia about X-XIx1257000000 mm4
Moment of Intertia about Y-YIy405000000 mm4
Elastic Section Modulus about X-XSx5506000 mm3
Elastic Section Modulus about Y-YSy1770000 mm3
Plastic Section Modulus about X-XZx6211000 mm3
Plastic Section Modulus about Y-YZy2737000 mm3
St. Venant Torsional ConstantJ8616000 mm4
Warping Torsion ConstantCw18905000000000 mm6
Self Weight of sectionWeight269 kg/m

Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.

A HP18X181 steel section is a standard North American steel section in the HP - Hollow Pipe category. It weighs 181 lb/ft and has a cross sectional area of 53.2 in2. The height and width of the section are 18 in and 18 in respectively.

The section has a tensile yield capacity of:

kip

The section has a flexural plastic moment capacity of:

kip-ft

The section has a flexural elastic moment capacity of:

kip-ft