UB – universal beams

254x102x25

Standard: BS 4-1:2005Source: Primary geometry (h, b, tw, tf, r) — calculated properties (exact engine)
Singapore uses BS / BS EN sections; same data as the United Kingdom.
xybf = 101.9d = 257.2tf = 8.4tf = 8.4tw = 6tw = 6
Cross-section, to scaledimensions in mm

Dimensions

Depthd
257.2mm
Flange widthbf
101.9mm
Web thicknesstw
6mm
Flange thicknesstf
8.4mm
Root radiusr
7.6mm

Mass and area

Mass per lengthm
25.15kg/m
Cross-sectional areaA
3,204mm²
Outside perimeterP
897mm

Strong axis x–x

Moment of inertiaIx
34.1510⁶ mm⁴
Elastic section modulusSx
265.510³ mm³
Plastic section modulusZx
305.510³ mm³
Radius of gyrationrx
103.2mm

Weak axis y–y

Moment of inertiaIy
1.48710⁶ mm⁴
Elastic section modulusSy
29.1810³ mm³
Plastic section modulusZy
46.0110³ mm³
Radius of gyrationry
21.54mm

Torsion and stability

Torsional constantJ
65.5710³ mm⁴
Warping constantCw
22.9210⁹ mm⁶

Equivalents in other standards