Dimensions and section properties for W8X31

Structural sectional properties for a W8X31 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X31
Cross Sectional AreaA9.13 in2
Section Widthb8 in
Section Depthd8 in
Flange thicknesstf0.435 in
Web thicknesstw0.285 in
Radius of Gyration about X-Xrx3.47 in
Radius of Gyrations about Y-Yry2.02 in
Moment of Inertia about X-XIx110 in4
Moment of Intertia about Y-YIy37.1 in4
Elastic Section Modulus about X-XSx27.5 in3
Elastic Section Modulus about Y-YSy9.27 in3
Plastic Section Modulus about X-XZx30.4 in3
Plastic Section Modulus about Y-YZy14.1 in3
St. Venant Torsional ConstantJ0.536 in4
Warping Torsion ConstantCw530 in6
Self Weight of sectionWeight31 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW8X31
Cross Sectional AreaA5890 mm2
Section Widthb203 mm
Section Depthd203 mm
Flange thicknesstf11 mm
Web thicknesstw7.2 mm
Radius of Gyration about X-Xrx88 mm
Radius of Gyrations about Y-Yry51 mm
Moment of Inertia about X-XIx46000000 mm4
Moment of Intertia about Y-YIy15000000 mm4
Elastic Section Modulus about X-XSx451000 mm3
Elastic Section Modulus about Y-YSy152000 mm3
Plastic Section Modulus about X-XZx498000 mm3
Plastic Section Modulus about Y-YZy231000 mm3
St. Venant Torsional ConstantJ223000 mm4
Warping Torsion ConstantCw142000000000 mm6
Self Weight of sectionWeight46 kg/m

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

A W8X31 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 31 lb/ft and has a cross sectional area of 9.13 in2. The height and width of the section are 8 in and 8 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