American (AISC)I-beam

W8×31

AISC W-shape, 8 inch depth, 31 lb/ft

SymbolPropertyValueUnit
dDepth8in
bfFlange width8in
tfFlange thickness0.435in
twWeb thickness0.285in
AArea9.13in²
wWeight per foot31lb/ft
IxIx110in⁴
SxSx27.5in³
ZxZx (plastic)30.4in³
rxrx3.47in
IyIy37.1in⁴
SySy9.27in³
ZyZy (plastic)14.1in³
ryry2.02in

Design with W8×31

Use the Section Design module to run flexure, shear, deflection, and code-compliance checks per AISC 360.

Open Steel Section Design

Source: American (AISC). Values are reference-grade — section properties don't change. For built-up or irregular sections, use the design modules to compute on custom geometry.