UB – universal beams

914x419x388

Standard: BS 4-1:2005Source: Primary geometry (h, b, tw, tf, r) — calculated properties (exact engine)
Range derived from BS 4-1; to be confirmed with the SAISC Red Book.
xybf = 420.5d = 921tf = 36.6tf = 36.6tw = 21.4tw = 21.4
Cross-section, to scaledimensions in mm

Dimensions

Depthd
921mm
Flange widthbf
420.5mm
Web thicknesstw
21.4mm
Flange thicknesstf
36.6mm
Root radiusr
24.1mm

Mass and area

Mass per lengthm
388kg/m
Cross-sectional areaA
49,422mm²
Outside perimeterP
3,440mm

Strong axis x–x

Moment of inertiaIx
7,19610⁶ mm⁴
Elastic section modulusSx
15,62710³ mm³
Plastic section modulusZx
17,66510³ mm³
Radius of gyrationrx
381.6mm

Weak axis y–y

Moment of inertiaIy
454.410⁶ mm⁴
Elastic section modulusSy
2,16110³ mm³
Plastic section modulusZy
3,34110³ mm³
Radius of gyrationry
95.89mm

Torsion and stability

Torsional constantJ
17,41310³ mm⁴
Warping constantCw
88,68810⁹ mm⁶

Equivalents in other standards