ISLB – light beams

ISLB 250

Standard: IS 808:2021Source: IS 808:2021 dimensions (BIS) — calculated properties, flange slope 98° (8°)
Tapered-flange sections; flange thickness measured at the quarter of the flange.
xybf = 125d = 250tf = 8.2tf = 8.2tw = 6.1tw = 6.1
Cross-section, to scaledimensions in mm

Dimensions

Depthd
250mm
Flange widthbf
125mm
Web thicknesstw
6.1mm
Flange thicknesstf
8.2mm
Root radiusr1
13mm
Toe radiusr2
6.5mm

Mass and area

Mass per lengthm
28kg/m
Cross-sectional areaA
3,567mm²
Published area (standard)A pub.
3,550mm²
Outside perimeterP
943.4mm

Strong axis x–x

Moment of inertiaIx
37.5210⁶ mm⁴
Elastic section modulusSx
300.210³ mm³
Plastic section modulusZx
34110³ mm³
Radius of gyrationrx
102.6mm

Weak axis y–y

Moment of inertiaIy
2.24210⁶ mm⁴
Elastic section modulusSy
35.8810³ mm³
Plastic section modulusZy
60.1610³ mm³
Radius of gyrationry
25.07mm

Slenderness ratios

Flange slope used%
6.99

Equivalents in other standards