Dimensions and section properties for W18X55

Structural sectional properties for a W18X55 standard steel section

steel section diagram

US Customary Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW18X55
Cross Sectional AreaA16.2 in2
Section Widthb7.53 in
Section Depthd18.1 in
Flange thicknesstf0.63 in
Web thicknesstw0.39 in
Radius of Gyration about X-Xrx7.41 in
Radius of Gyrations about Y-Yry1.67 in
Moment of Inertia about X-XIx890 in4
Moment of Intertia about Y-YIy44.9 in4
Elastic Section Modulus about X-XSx98.3 in3
Elastic Section Modulus about Y-YSy11.9 in3
Plastic Section Modulus about X-XZx112 in3
Plastic Section Modulus about Y-YZy18.5 in3
St. Venant Torsional ConstantJ1.66 in4
Warping Torsion ConstantCw3430 in6
Self Weight of sectionWeight55 lb/ft

Metric Units

DescriptionSymbolValue
Shape Category / DesignationTypeW
Section NameNameW18X55
Cross Sectional AreaA10452 mm2
Section Widthb191 mm
Section Depthd460 mm
Flange thicknesstf16 mm
Web thicknesstw9.9 mm
Radius of Gyration about X-Xrx188 mm
Radius of Gyrations about Y-Yry42 mm
Moment of Inertia about X-XIx370000000 mm4
Moment of Intertia about Y-YIy19000000 mm4
Elastic Section Modulus about X-XSx1611000 mm3
Elastic Section Modulus about Y-YSy195000 mm3
Plastic Section Modulus about X-XZx1835000 mm3
Plastic Section Modulus about Y-YZy303000 mm3
St. Venant Torsional ConstantJ691000 mm4
Warping Torsion ConstantCw921000000000 mm6
Self Weight of sectionWeight82 kg/m

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

A W18X55 steel section is a standard North American steel section in the W - Wide Flange category. It weighs 55 lb/ft and has a cross sectional area of 16.2 in2. The height and width of the section are 18.1 in and 7.53 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