C – standard channels

C310x30.8

Standard: ASTM A6/A6M (désignations métriques)Source: SI values from the AISC v16.0 database (ASTM A6 shapes common to Canada)
ASTM A6 rolled shapes are the same in Canada; the CISC list may differ slightly (availability).
xybf = 74.7d = 305tf = 12.7tf = 12.7tw = 7.16tw = 7.16
Cross-section, to scaledimensions in mm

Dimensions

Depthd
305mm
Flange widthbf
74.7mm
Web thicknesstw
7.16mm
Flange thicknesstf
12.7mm
Distance k (design)kdes
28.7mm
Distance k (detailing)kdet
28.6mm
Web clear depthT
248mm
Distance between flange centroidsho
292mm

Mass and area

Mass per lengthm
30.8kg/m
Cross-sectional areaA
3,920mm²

Strong axis x–x

Moment of inertiaIx
53.710⁶ mm⁴
Elastic section modulusSx
35210³ mm³
Plastic section modulusZx
42010³ mm³
Radius of gyrationrx
117mm

Weak axis y–y

Moment of inertiaIy
1.6110⁶ mm⁴
Elastic section modulusSy
28.210³ mm³
Plastic section modulusZy
56.910³ mm³
Radius of gyrationry
20.2mm

Torsion and stability

Torsional constantJ
15410³ mm⁴
Warping constantCw
30.110⁹ mm⁶
Effective radius of gyrationrts
25mm
Polar radius (shear center)r̄o
125mm
Flexural constantH
0.899
Shear centereo
22.1mm

Centers

Centroidx̄
17.7mm
Plastic neutral axisxp
6.43mm

Slenderness ratios

Web slendernessh/tw
35.2
Wall slendernessb/t
5.87

Equivalents in other standards